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at
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v
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o
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L
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2
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1
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m
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a
m
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u
n
ctio
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w
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h
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co
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p
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ter
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1
3
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.
Yet,
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en
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g
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n
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th
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co
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p
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ter
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m
ar
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n
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s
d
ev
ices
[
9
]
,
[
15
-
1
4
]
,
as sh
o
w
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1
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I
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Dig
it
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nv
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(
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en
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m
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f
t
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f
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r
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to
p
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s
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tial
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h
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f
in
al
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lt a
n
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f
r
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m
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w
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r
k
[
7
-
8
]
ar
e
s
h
o
w
n
in
F
i
g
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r
e
1
.
Fig
u
r
e
1
.
I
DFI
F
m
o
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[7
-
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1
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1
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N
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t
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1
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2
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1
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3
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1
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2
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1
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1
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R
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I
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I
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F st
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in
to
4
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s
tag
e
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w
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co
n
s
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t o
f
:
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P
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e
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P
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ce
s
s
: N
o
tif
icatio
n
,
au
t
h
o
r
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n
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d
p
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ar
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.
2)
P
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tiv
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P
r
o
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co
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,
cr
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e
i
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t,
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cr
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v
e
:
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d
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ti
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icatio
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lle
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s
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d
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in
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.
2
.
3
.
So
f
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s
t
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M
et
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(
SS
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)
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H
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s
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ed
as
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x
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licit
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th
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ac
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p
tab
le
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al
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o
f
all
p
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le
[
1
1
-
1
2
]
.
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u
s
ed
to
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m
t
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s
is
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n
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ev
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lu
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n
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m
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n
tech
n
o
lo
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y
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it
p
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d
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ce
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a
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e
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p
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e
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th
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ig
ital
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th
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co
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ld
b
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b
etter
th
a
n
th
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p
r
ev
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s
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[
1
0
,
1
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]
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is
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it
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e
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.
T
h
e
s
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v
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s
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s
o
f
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1)
Sit
ua
tio
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C
o
ns
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P
r
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le
m
a
tic:
T
h
e
f
ir
s
t
s
ta
g
e
o
f
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S
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n
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er
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to
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ief
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ta
n
d
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g
ab
o
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t
t
h
e
p
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ce
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s
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is
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p
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s
.
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r
ce
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o
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o
n
th
e
co
u
r
s
e
o
f
t
h
e
p
r
o
ce
s
s
.
O
v
er
v
ie
w
o
f
t
h
e
g
en
er
al
p
r
o
ce
s
s
is
t
h
e
b
as
is
f
o
r
t
h
e
m
ak
in
g
o
f
r
ic
h
p
ict
u
r
e
to
m
ak
e
t
h
e
g
r
o
o
v
e
co
u
r
s
e
o
f
t
h
e
p
r
o
ce
s
s
to
b
e
m
o
r
e
v
is
ib
le
.
2)
P
r
o
b
lem
Sit
ua
tio
n
E
x
p
r
ess
ed
:
T
h
e
o
v
er
v
ie
w
p
r
ese
n
ted
f
r
o
m
t
h
e
f
ir
s
t
s
ta
g
e
ca
n
m
a
k
e
a
clea
r
er
p
ictu
r
e
ca
lled
a
r
ich
p
ict
u
r
e.
R
ich
P
ictu
r
e
s
h
o
w
s
th
e
en
tire
d
etails
i
n
v
o
l
v
ed
i
n
t
h
e
p
r
o
ce
s
s
a
n
d
i
s
d
escr
ib
ed
in
a
s
tr
u
ct
u
r
ed
o
v
er
v
ie
w
o
f
t
h
e
p
r
o
ce
s
s
.
3)
R
o
o
t
Def
ini
tio
n
o
f
R
elev
a
nt
Sys
tem
:
Def
in
in
g
th
e
en
tire
p
r
o
ce
s
s
th
at
h
as
b
ee
n
d
escr
ib
ed
in
th
e
p
r
o
b
lem
s
itu
a
tio
n
e
x
p
r
ess
ed
f
o
r
m
te
x
t
u
al
s
to
r
y
li
n
e
an
d
co
n
ci
s
e.
4)
C
o
ncep
tua
l
Mo
d
el
o
f
Sys
tem
Descri
b
ed
a
nd
R
o
o
t
Def
ini
ti
o
n
:
B
ased
o
n
th
e
tex
t
u
al
d
ef
i
n
itio
n
f
o
r
ea
ch
d
ef
in
ed
e
le
m
en
t,
i
m
p
r
o
v
e
m
en
t
s
to
th
e
co
n
ce
p
tu
a
l
m
o
d
el
is
n
ee
d
ed
to
ac
h
iev
e
th
e
id
ea
l g
o
a
l.
5)
C
o
m
p
a
r
is
o
n
o
f
Mo
d
el
a
nd
R
ea
l
Wo
r
ld
:
C
o
m
p
ar
in
g
b
et
w
e
en
th
e
co
n
ce
p
tu
a
l
m
o
d
el
w
i
th
th
e
r
ea
lit
y
i
n
th
e
r
ea
l
w
o
r
ld
s
o
th
at
ad
eq
u
ate
le
v
el
o
f
co
n
ce
p
tu
al
m
o
d
el
ca
n
b
e
r
ev
ea
led
to
s
o
lv
e
a
p
r
o
b
lem
.
6)
Sys
tem
a
tica
lly
Desir
a
b
le
a
nd
C
ult
ur
a
lly
F
ea
s
ia
b
le
C
ha
ng
e
s
:
Def
in
i
n
g
t
h
e
c
h
an
g
e
s
t
h
at
m
u
s
t
b
e
m
ad
e
to
th
e
ex
i
s
ti
n
g
m
o
d
els.
I
n
t
h
is
s
te
p
,
th
e
s
p
ec
if
ied
ch
a
n
g
e
is
p
o
s
s
ib
le.
7)
A
ctio
n
t
o
I
m
p
r
o
ve
t
he
P
r
o
b
lem
Sit
ua
tio
n
:
T
ak
in
g
co
r
r
ec
tiv
e
ac
tio
n
b
y
m
ea
n
s
o
f
in
ter
v
en
in
g
c
h
an
g
e
s
in
th
e
i
m
p
le
m
e
n
tatio
n
m
o
d
el.
3.
RE
S
E
ARCH
M
E
T
H
O
DS
Me
th
o
d
o
lo
g
y
f
o
r
co
n
d
u
cti
n
g
e
v
alu
a
tio
n
o
f
I
D
FIF
h
a
s
d
etail
s
tag
es a
n
d
is
ill
u
s
tr
ated
i
n
Fi
g
u
r
e
2
.
Fig
u
r
e
2
.
R
esear
ch
m
et
h
o
d
s
1)
I
d
en
tif
y
in
g
a
R
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Pr
o
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le
m
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y
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ee
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m
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en
ts
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atio
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ar
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o
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s
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ay
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to
test
s
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ain
s
t
I
DF
I
F s
o
th
at
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ll
t
h
e
s
h
o
r
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co
m
in
g
s
o
f
th
at
f
r
am
ew
o
r
k
ca
n
b
e
k
n
o
w
n
.
2)
I
d
en
tif
y
in
g
a
R
ese
ar
ch
Pr
o
b
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m
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s
ee
in
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v
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io
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s
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o
m
en
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ev
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ts
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d
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f
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m
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n
in
v
ar
i
o
u
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ain
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t
I
DF
I
F
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s
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f
r
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e
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r
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b
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k
n
o
w
n
.
3)
R
ev
iew
in
g
th
e
liter
atu
r
e
b
y
s
ea
r
ch
in
g
th
e
b
asi
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th
e
o
r
ies
r
el
ate
d
t
o
th
e
I
DF
I
F
p
r
o
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lem
s
o
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r
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r
ch
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d
th
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o
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s
m
ar
tp
h
o
n
e
ev
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en
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e
h
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d
lin
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.
4)
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t
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tem
Me
th
o
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y
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o
r
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F
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.
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tiv
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p
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c
ess
s
tag
e
.
5)
C
ase
S
tu
d
y
by
c
o
n
d
u
ct
in
g
a
n
ev
alu
a
ti
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an
d
is
u
n
d
e
r
t
ak
en
t
o
test
b
o
th
I
DF
I
F
m
o
d
el
s
o
n
s
m
ar
tp
h
o
n
e
in
v
esti
g
ati
o
n
h
an
d
l
in
g
.
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ith
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4.
RE
SU
L
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AND
ANA
L
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S
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h
e
d
ata
o
b
tain
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f
r
o
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t
h
e
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lt
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o
f
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r
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p
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in
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d
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tan
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ig
ital
ev
id
en
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a
n
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g
f
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r
s
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Fro
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ased
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F c
an
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e
s
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n
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4
.
1
.
Sta
g
e
1
o
f
SS
M
:
Situa
t
io
n Co
ns
idere
d P
ro
ble
m
a
t
ic
I
n
Gen
er
a
l,
b
ased
o
n
th
e
r
e
s
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l
ts
i
n
th
e
p
r
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ce
s
s
o
f
i
m
p
le
m
en
t
atio
n
o
f
t
h
e
I
n
teg
r
ated
Di
g
ita
l
Fo
r
en
s
ic
s
I
n
v
e
s
tig
a
tio
n
Fra
m
e
w
o
r
k
(
I
DF
I
F),
th
e
s
it
u
atio
n
al
p
r
o
b
le
m
s
i
n
clu
d
e:
1)
Ste
p
2
.
6
s
e
cu
r
in
g
th
e
s
ce
n
e
s
h
o
u
l
d
b
e
p
la
ce
d
in
p
o
s
iti
o
n
2
.
1
o
n
p
r
o
ac
t
iv
e
c
o
lle
cti
o
n
.
2)
T
h
er
e
is
n
o
c
o
n
d
iti
o
n
in
g
if
ev
id
en
ce
w
as
f
o
u
n
d
in
"
on
"
o
r
"
o
ff
"
m
o
d
e
,
es
p
e
cia
lly
in
th
e
s
m
ar
t
p
h
o
n
e
h
an
d
lin
g
.
3)
T
h
er
e
is
n
o
d
ete
r
m
in
atio
n
o
f
w
h
eth
er
th
e
d
ig
it
al
ev
i
d
en
c
e
h
an
d
lin
g
p
r
o
ce
s
s
is
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ar
r
i
ed
o
u
t
o
n
th
e
s
p
o
t o
r
in
a
co
m
p
u
te
r
f
o
r
en
s
ics
la
b
o
r
at
o
r
y
.
4
.
2
.
Sta
g
e
2
o
f
SS
M
:
P
r
o
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Situa
t
io
n E
x
pres
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h
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o
f
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D
FIF’
s
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r
o
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e
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d
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h
a
s
e
p
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o
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s
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p
l
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h
t
h
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n
d
itio
n
s
i
n
th
e
f
ield
an
d
o
n
l
y
d
escr
ib
es t
h
e
s
tag
es
f
o
r
h
a
n
d
lin
g
co
m
p
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te
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as sh
o
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n
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n
Fi
g
u
r
e
3
.
Fig
u
r
e
3
.
R
ich
p
ict
u
r
e
I
DFI
F [
7
-
8]
E
v
alu
a
tio
n
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m
p
r
o
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e
m
e
n
t
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g
ain
s
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t
h
e
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ee
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ed
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e
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ca
n
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e
ap
p
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b
all
y
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n
d
ig
ital e
v
id
en
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h
an
d
li
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g
p
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s
s
.
4
.
3
.
Sta
g
e
3
o
f
SS
M
:
Ro
o
t
De
f
ini
t
io
n o
f
Rele
v
a
nt
Sy
s
t
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m
T
h
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p
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o
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s
s
o
f
th
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d
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g
ital
e
v
id
en
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a
n
d
li
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g
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h
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u
ld
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e
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ad
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ter
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ar
ticu
lar
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o
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ed
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s
m
ar
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o
n
e
d
e
v
ice
s
r
elate
d
in
th
e
f
ield
[
1
7
].
I
n
cid
en
t
r
esp
o
n
s
e
p
r
o
ce
s
s
is
th
e
d
ig
ital
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id
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ce
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ce
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e
(
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e
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e
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ce
n
e)
,
esp
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iall
y
in
th
e
s
m
ar
tp
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o
n
e
d
ev
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h
a
n
d
lin
g
.
1
.
1
.
N
o
t
i
f
i
c
a
t
i
o
n
1
.
2
.
A
u
t
h
o
r
i
z
a
t
i
o
n
1
.
3
.
P
r
e
p
a
r
a
t
i
o
n
1
.
P
r
e
-
P
r
o
c
e
s
s
2
.
1
.
1
.
I
n
c
i
d
e
n
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R
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s
p
o
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V
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a
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e
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c
t
i
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n
d
C
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e
c
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f
N
e
t
w
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r
k
T
r
a
c
e
s
2
.
P
r
o
a
c
t
i
v
e
2
.
1
.
P
r
o
a
c
t
i
v
e
C
o
l
l
e
c
t
i
o
n
2
.
2
.
1
.
E
v
e
n
t
T
r
i
g
g
e
r
i
n
g
F
u
n
c
t
i
o
n
&
C
o
m
m
u
n
i
c
a
t
i
o
n
S
h
i
e
l
d
i
n
g
2
.
2
.
C
r
i
m
e
S
c
e
n
e
I
n
v
e
s
t
i
g
a
t
i
o
n
2
.
2
.
2
.
D
o
c
u
m
e
n
t
i
n
g
t
h
e
S
c
e
n
e
2
.
3
.
P
r
o
a
c
t
i
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e
P
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e
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v
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2
.
4
.
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A
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2
.
5
.
P
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e
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R
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p
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2
.
6
.
S
e
c
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2
.
7
.
D
e
t
e
c
t
i
o
n
o
f
I
n
c
i
d
e
n
t
/
C
r
i
m
e
3
.
R
e
a
c
t
i
v
e
3
.
1
.
I
d
e
n
t
i
f
i
c
a
t
i
o
n
3
.
1
.
1
.
S
u
r
v
e
y
3
.
1
.
2
.
R
e
c
o
c
n
i
t
i
o
n
3
.
2
.
C
o
l
l
e
c
t
i
o
n
&
A
c
q
u
i
c
i
t
i
o
n
3
.
3
.
1
.
T
r
a
n
s
p
o
r
t
a
t
i
o
n
3
.
3
.
P
r
e
s
e
r
v
a
t
i
o
n
3
.
3
.
2
.
S
t
o
r
a
g
e
3
.
4
.
E
x
a
m
i
n
i
t
i
o
n
3
.
5
.
A
n
a
l
y
s
i
s
3
.
6
.
P
r
e
s
e
n
t
a
t
i
o
n
4
.
P
o
s
t
-
P
r
o
c
e
s
s
4
.
1
.
C
o
n
c
l
u
s
i
o
n
4
.
2
.
R
e
c
o
n
t
r
u
c
t
i
o
n
4
.
3
.
D
i
s
s
e
m
i
n
a
t
i
o
n
N
o
Y
e
s
C
o
n
t
i
n
u
e
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
0
8
8
-
8708
I
J
E
C
E
Vo
l.
7
,
No
.
5
,
Octo
b
er
2
0
1
7
:
2
8
0
6
–
2
8
1
7
2810
1)
Secu
r
in
g
t
h
e
Sc
en
e
is
a
p
r
o
c
ess
t
o
k
ee
p
th
e
c
r
im
e
s
c
en
e
s
o
th
at
th
e
n
ec
ess
a
r
y
ev
id
en
c
e
d
o
es
n
o
t
l
o
s
t
,
d
am
ag
ed
,
ex
p
e
r
ien
c
e
a
d
d
iti
o
n
o
r
s
u
b
t
r
ac
ti
o
n
an
d
th
er
e
is
n
o
d
if
f
er
en
t
r
esu
l
t
in
d
if
f
icu
lt
o
r
o
b
s
cu
r
e
cr
im
e
s
ce
n
e
p
r
o
c
ess
in
g
an
d
ex
am
in
atio
n
o
f
tech
n
i
ca
l
s
c
ien
tif
i
c
b
as
is
[
1
8
-
20]
,
[
2
5
]
.
2)
Do
cu
m
en
tin
g
t
h
e
Sc
en
e
is
a
d
o
cu
m
en
tatio
n
p
r
o
ce
s
s
o
f
all
lo
ca
ti
o
n
s
an
d
d
ig
ita
l
d
ev
ices
in
clu
d
in
g
s
m
ar
tp
h
o
n
es
d
ev
ic
es
in
th
e
a
r
ea
o
f
th
e
cr
im
e
s
ce
n
e
w
ith
o
u
t
to
u
ch
in
g
o
r
p
o
l
lu
tin
g
th
e
s
m
ar
t
p
h
o
n
e
d
ev
i
ce
an
d
th
e
en
v
ir
o
n
m
en
t in
w
h
ich
it w
as f
o
u
n
d
[
1
8
-
2
2
]
.
3)
E
v
en
t
T
r
ig
g
e
r
in
g
is
th
e
s
e
ar
c
h
p
r
o
c
ess
th
a
t
t
r
ig
g
e
r
s
th
e
e
v
en
ts
at
th
e
s
c
en
e
o
f
th
e
m
atte
r
s
o
th
at
th
e
in
v
esti
g
at
o
r
co
u
l
d
c
o
n
clu
d
e
o
n
th
e
f
iel
d
w
h
ile
th
e
ty
p
e
o
f
c
r
i
m
e
h
as b
ee
n
d
o
n
e
[
2
]
,
[2
3
-
2
4
].
4)
P
lu
g
I
n
P
o
r
t
a
b
le
Po
w
er
Su
p
p
l
y
is
a
p
r
o
ce
s
s
t
o
k
ee
p
th
e
s
m
ar
tp
h
o
n
e
d
ev
ic
e
co
n
d
it
io
n
s
in
a
o
n
-
s
tat
e
t
o
g
et
t
o
th
e
l
ab
o
r
a
to
r
y
f
o
r
f
u
r
th
e
r
ex
am
in
ati
o
n
p
r
o
ce
s
s
[
1
8
].
5)
C
o
m
m
u
n
icati
o
n
Sh
iel
d
in
g
is
a
p
r
o
ce
s
s
o
f
s
m
ar
t
p
h
o
n
e
d
ev
ic
e
is
o
l
ati
o
n
f
r
o
m
all
r
a
d
i
o
n
e
tw
o
r
k
(
e
.
g
.
W
i
-
Fi,
B
lu
e
to
o
th
)
to
k
ee
p
t
r
af
f
ic
d
at
a,
s
u
ch
as
SM
S m
ess
ag
in
g
an
d
o
th
er
s
[
1
8
-
2
2
]
.
6)
Seiz
e
is
a
p
r
o
ce
s
s
o
f
f
o
r
e
cl
o
s
u
r
e
ag
ain
s
t
th
e
d
ig
i
tal
ev
i
d
en
ce
t
h
at
is
m
ain
ly
o
n
a
s
m
ar
tp
h
o
n
e
d
ev
i
ce
[1
8
].
7)
T
r
an
s
p
o
r
tat
io
n
is
at
r
em
o
v
al
p
r
o
ce
s
s
o
f
d
ig
ita
l
ev
i
d
en
ce
p
r
im
ar
ily
o
n
a
s
m
ar
t
p
h
o
n
e
d
e
v
ice
f
r
o
m
s
ce
n
e
h
ea
d
in
g
t
o
th
e
la
b
f
o
r
f
u
r
th
e
r
e
x
am
in
atio
n
p
r
o
c
ess
[
1
8
]
,
[
2
0
-
2
1
]
.
L
ab
o
r
ato
r
y
p
r
o
ce
s
s
is
an
ex
a
m
in
at
io
n
p
r
o
ce
s
s
o
f
d
ig
it
al
ev
id
en
ce
in
th
e
s
m
ar
tp
h
o
n
e
d
ev
ice
esp
ec
iall
y
t
h
o
s
e
co
n
d
u
c
ted
in
l
ab
o
r
ato
r
ies
w
ic
h
i
n
cl
u
d
e
s
ev
er
al
p
r
o
ce
s
s
,
i.e
.
:
1)
A
cq
u
is
iti
o
n
is
a
p
r
o
c
ess
t
o
o
b
t
ain
d
ata
o
r
in
f
o
r
m
atio
n
f
r
o
m
t
h
e
s
m
ar
t
p
h
o
n
e
d
ev
ic
e
o
r
r
e
lat
e
d
m
ed
ia
[
1
8
-
2
3
]
,
[
2
5
]
.
2)
Sto
r
ag
e
is
th
e
p
r
o
c
ess
o
r
r
esu
lt
o
f
a
d
o
u
b
l
in
g
o
f
s
t
o
r
ag
e
a
c
q
u
is
it
io
n
s
o
f
d
ig
ita
l
ev
id
en
ce
to
m
ain
tain
th
e
s
ec
u
r
ity
o
f
th
e
d
a
ta
th
at
h
as
b
e
en
o
b
tain
e
d
[
1
8
-
2
1
]
.
3)
T
h
e
E
x
am
in
atio
n
is
an
ex
am
in
ati
o
n
p
r
o
c
ess
th
at
r
ev
ea
ls
th
e
d
ig
it
al
ev
i
d
en
c
e
in
c
lu
d
in
g
th
o
s
e
th
a
t
m
ig
h
t
b
e
h
id
d
en
o
r
o
m
itte
d
[
1
8
-
2
3
]
.
4)
T
h
e
t
ec
h
n
ic
al
r
ev
i
ew
is
an
an
aly
s
is
p
r
o
ce
s
s
.
I
t
co
n
s
t
r
u
ct
s
th
e
lin
k
am
o
n
g
th
e
f
in
d
in
g
s
b
o
th
t
h
e
p
er
p
e
tr
at
o
r
s
w
ith
ev
id
en
ce
,
o
b
t
ain
e
d
ev
i
d
e
n
ce
w
ith
th
e
v
i
ctim
an
d
th
e
o
f
f
en
d
e
r
w
ith
th
e
v
ict
im
[
18
-
2
3
]
,
[
2
5
].
5)
R
ep
o
r
tin
g
is
a
p
r
o
ce
s
s
o
f
p
r
ep
ar
in
g
a
d
eta
ile
d
s
u
m
m
ar
y
o
f
a
ll
s
t
e
p
s
t
ak
en
an
d
c
o
n
c
lu
s
io
n
s
r
ea
ch
e
d
in
th
e
in
v
esti
g
ati
o
n
o
f
th
e
ca
s
e
[
18
-
2
3
]
,
[
2
5
].
4
.
4
.
Sta
g
e
4
o
f
SS
M
:
Co
ncep
t
ua
l
M
o
del o
f
Sy
s
t
em
De
s
cr
i
bed And Ro
o
t
Def
ini
t
io
n
D
ig
ital
ev
id
en
ce
r
eq
u
ir
e
s
s
te
p
th
at
h
as
f
le
x
ib
ili
t
y
in
h
a
n
d
lin
g
v
ar
io
u
s
t
y
p
es
o
f
d
i
g
ita
l
ev
id
e
n
ce
b
ec
au
s
e
ev
er
y
cr
i
m
e
s
ce
n
e
is
al
w
a
y
s
d
if
f
er
e
n
t
an
d
also
u
s
e
s
to
o
ls
an
d
th
e
in
v
esti
g
ato
r
h
av
e
to
w
o
r
k
b
ased
o
n
th
e
h
a
n
d
li
n
g
p
r
in
c
ip
les [
2
]
,
[
1
9
]
.
Fig
u
r
e
4
is
a
co
n
ce
p
tu
al
I
D
FIF
v
2
.
T
h
e
p
r
in
cip
le
o
f
I
DFI
F
is
to
g
et
d
ata
th
at
ca
n
b
e
u
s
ed
a
n
d
tak
e
n
f
r
o
m
th
e
co
m
p
u
ter
r
eso
u
r
ce
s
,
co
m
p
u
ter
s
y
s
te
m
s
,
co
m
p
u
ter
n
et
w
o
r
k
s
,
co
m
m
u
n
icatio
n
l
i
n
es,
s
to
r
ag
e
m
ed
ia,
co
m
p
u
te
r
ap
p
licatio
n
s
an
d
o
th
er
s
[
2
1
]
,
[
2
3
]
.
Su
ch
d
ata
c
an
b
e
p
r
o
ce
s
s
ed
in
ac
co
r
d
an
c
e
w
it
h
th
e
p
r
o
ce
d
u
r
es,
s
o
th
at
it
ca
n
s
er
v
e
as
leg
al
an
d
leg
iti
m
ate
e
v
id
en
ce
[
22
-
2
3
].
T
h
e
m
ain
p
r
in
cip
les
to
b
e
f
o
ll
o
w
ed
b
y
th
e
in
v
est
ig
ato
r
i
n
t
h
e
h
a
n
d
lin
g
o
f
d
ig
i
tal
e
v
id
en
ce
esp
ec
iall
y
s
m
ar
tp
h
o
n
es a
r
e
as
f
o
llo
w
s
:
1)
Ma
y
n
o
t
ch
an
g
e
th
e
o
r
ig
in
a
l
d
ata
th
at
h
a
s
b
ee
n
o
b
t
ain
e
d
.
2)
Ma
k
e
a
co
m
p
le
te
r
ec
o
r
d
o
f
all
ac
tiv
i
ties
r
el
ate
d
to
th
e
a
cq
u
is
it
io
n
an
d
h
an
d
l
in
g
th
e
o
r
ig
in
a
l
a
n
d
c
o
p
i
ed
d
at
a.
T
h
e
o
r
ig
in
al
d
at
a
m
u
s
t b
e
p
r
es
er
v
e
d
.
3)
Mu
s
t n
o
t
u
n
d
e
r
tak
e
a
ctiv
i
ties
t
h
at
a
r
e
b
ey
o
n
d
th
e
a
b
i
lity
o
r
k
n
o
w
led
g
e.
4)
Mu
s
t c
o
n
s
i
d
e
r
all
a
s
p
ec
ts
o
f
p
e
r
s
o
n
al
s
af
ety
an
d
e
q
u
i
p
m
en
t w
h
ile
d
o
in
g
th
e
w
o
r
k
.
5)
A
n
y
ti
m
e
th
e
leg
a
l
r
ig
h
ts
o
f
p
e
o
p
le
af
f
ec
te
d
b
y
th
e
ac
ti
o
n
th
a
t
s
h
o
u
l
d
b
e
co
n
s
i
d
e
r
ed
.
6)
Nee
d
to
b
e
aw
ar
e
o
f
all
th
e
o
r
g
an
iza
ti
o
n
'
s
p
o
li
cies
an
d
p
r
o
ce
d
u
r
es
r
e
lat
e
d
t
o
a
ctiv
it
ies
p
e
r
f
o
r
m
ed
.
7)
C
o
m
m
u
n
ic
ati
o
n
m
u
s
t
b
e
m
ain
tain
e
d
in
a
cc
o
r
d
an
c
e
w
ith
th
e
cl
ien
ts
,
leg
al
p
r
ac
titi
o
n
e
r
s
,
s
u
p
e
r
v
is
o
r
s
an
d
o
th
e
r
te
am
m
e
m
b
er
s
.
I
DFI
F
s
tag
e
s
in
th
e
p
r
o
ce
s
s
o
f
s
m
ar
tp
h
o
n
e
d
ig
ital
ev
id
e
n
ce
in
v
est
ig
at
io
n
p
r
i
m
ar
il
y
h
as
f
o
u
r
m
ain
s
tag
e
s
an
d
ea
ch
s
tag
e
h
as a
s
u
b
-
p
r
o
ce
s
s
.
P
r
ep
ar
atio
n
is
a
p
r
ep
ar
atio
n
th
at
m
u
s
t b
e
d
o
n
e
to
p
er
f
o
r
m
th
e
p
r
o
ce
s
s
o
f
in
v
esti
g
atio
n
in
h
a
n
d
lin
g
t
h
e
d
ig
ital e
v
id
en
ce
b
eg
i
n
s
o
n
th
e
s
p
o
r
ts
s
ce
n
e
o
f
t
h
e
m
atter
u
n
ti
l
m
ak
in
g
t
h
e
f
i
n
al
r
ep
o
r
t.
1)
No
t
if
ica
ti
o
n
:
T
h
e
im
p
lem
en
tatio
n
o
f
in
v
esti
g
at
io
n
o
r
c
r
im
e
r
e
p
o
r
t
e
d
t
o
law
en
f
o
r
ce
m
en
t.
2)
A
u
th
o
r
iz
ati
o
n
:
T
h
e
s
tag
e
t
o
g
e
t th
e
r
ig
h
t
ev
id
en
ce
a
cc
ess
an
d
th
e
l
eg
al
s
ta
tu
s
o
f
th
e
in
q
u
ir
y
p
r
o
ce
s
s
.
3)
Pre
p
a
r
a
ti
o
n
:
T
h
e
p
r
e
p
a
r
a
ti
o
n
s
tag
e
th
at
in
clu
d
es
th
e
av
ail
ab
i
lity
o
f
p
e
r
s
o
n
n
el
,
v
ar
io
u
s
to
o
l
s
an
d
al
l
th
in
g
s
n
ee
d
e
d
in
th
e
in
v
est
ig
ati
o
n
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
J
E
C
E
I
SS
N:
2
0
8
8
-
8708
E
va
lu
a
tio
n
o
f I
n
te
g
r
a
ted
Dig
ita
l F
o
r
en
s
ics I
n
ve
s
tig
a
tio
n
F
r
a
mewo
r
k
fo
r
th
e
I
n
ve
s
tig
a
tio
n
…
(
R
u
u
h
w
a
n
)
2811
Fig
u
r
e
4
.
C
o
n
ce
p
tu
al
I
DFI
F v
2
I
n
cid
en
t
R
esp
o
n
s
e
i
s
an
ac
t
iv
i
t
y
t
h
at
is
ca
r
r
ied
o
u
t
at
th
e
s
c
en
e
o
f
t
h
e
m
a
tter
w
ith
a
v
ie
w
to
s
ec
u
r
e
th
e
ex
i
s
ti
n
g
d
ig
ital e
v
id
en
ce
,
s
o
it is
n
o
t c
o
n
ta
m
i
n
ated
b
y
o
th
er
th
in
g
s
.
1)
Secu
r
in
g
t
h
e
Sc
en
e:
A
m
ec
h
an
is
m
to
s
e
cu
r
e
th
e
cr
im
e
s
ce
n
e
an
d
p
r
o
te
ct
th
e
in
teg
r
ity
o
f
ev
i
d
en
c
e.
2)
Do
cu
m
en
tati
o
n
o
f
t
h
e
S
ce
n
e
:
Pro
ce
s
s
in
g
th
e
s
ce
n
e
o
f
th
in
g
s
,
lo
o
k
in
g
f
o
r
th
e
s
o
u
r
ce
o
f
th
e
tr
ig
g
er
ev
en
t,
lo
o
k
in
g
f
o
r
th
e
c
o
n
n
ec
t
io
n
o
f
co
m
m
u
n
icatio
n
o
r
n
etw
o
r
k
an
d
d
o
cu
m
en
tin
g
th
e
s
ce
n
e
b
y
ta
k
i
n
g
a
p
i
ctu
r
e
o
f
ev
er
y
d
eta
il
o
f
th
e
s
ce
n
e.
3)
E
v
en
t
T
r
ig
g
e
r
in
g
:
I
n
iti
al
an
al
y
s
is
o
f
th
e
p
r
o
c
ess
.
I
n
th
e
l
a
te
s
t
ag
e
s
o
f
th
e
ev
en
t
tr
ig
g
er
in
g
,
th
e
r
e
is
a
d
e
cisi
o
n
p
r
o
ce
s
s
.
4)
Pro
ac
tiv
e
Pr
ese
r
v
ati
o
n
:
T
h
is
s
tag
e
h
as
f
iv
e
s
u
b
-
p
h
ases
i.
e.
n
etw
o
r
k
tr
ac
e
,
is
s
ea
r
ch
in
g
t
r
ac
es
th
r
o
u
g
h
th
e
n
etw
o
r
k
th
at
is
u
s
e
d
b
y
th
e
d
i
g
ital
ev
i
d
en
c
e
:
p
lu
g
in
p
o
r
t
ab
l
e
p
o
w
er
s
u
p
p
ly
,
is
th
e
p
r
o
ce
s
s
o
f
s
af
eg
u
a
r
d
in
g
d
ig
it
al
ev
id
en
ce
in
"o
n
"
s
t
ate
s
o
th
e
p
o
w
er
c
o
n
tain
ed
in
th
e
d
i
g
ital
ev
id
en
ce
ca
n
b
e
p
r
es
er
v
e
d
a
lo
n
g
th
e
w
a
y
u
n
til
in
th
e
f
o
r
en
s
i
c
l
a
b
o
r
a
t
o
r
y
;
c
o
m
m
u
n
icatio
n
s
h
ie
ld
in
g
,
is
th
e
is
o
l
atin
g
d
at
a
co
m
m
u
n
icati
o
n
o
n
d
is
a
b
lin
g
s
tag
es
ex
h
i
b
its
d
ig
ita
l
s
o
as
to
p
r
ev
en
t
d
ata
ch
an
g
es
f
r
o
m
th
e
o
u
ts
id
e
;
an
d
v
o
la
tile
an
d
n
on
-
v
o
lat
ile
ev
id
en
ce
,
is
th
e
p
r
o
ce
s
s
o
f
s
af
e
g
u
ar
d
in
g
d
ig
ita
l
ev
id
en
ce
.
5)
Pro
ac
t
iv
e
A
n
aly
s
is
:
L
iv
e
an
a
l
y
s
is
s
tag
e
ag
ain
s
t
th
e
f
in
d
in
g
s
an
d
b
u
il
d
th
e
f
i
r
s
t
h
y
p
o
th
e
s
is
o
f
a
s
c
en
e
.
Dete
cti
o
n
o
f
i
n
ci
d
en
t/
c
r
im
e,
a
t
th
is
s
tag
e
,
is
a
s
t
ag
e
to
en
s
u
r
e
th
at
th
e
r
e
h
as
b
ee
n
a
v
i
o
l
at
io
n
o
f
th
e
l
aw
.
A
cq
u
is
iti
o
n
is
th
e
p
r
o
ce
s
s
o
f
d
ata
a
cq
u
is
iti
o
n
ag
ain
s
t
th
e
f
in
d
in
g
s
to
r
eli
ev
e
th
e
w
o
r
k
lo
a
d
o
f
f
o
r
en
s
ic
d
ig
it
al
an
aly
s
is
in
th
e
la
b
o
r
at
o
r
y
.
Pre
lim
in
ar
y
r
ep
o
r
t
is
th
e
p
r
o
c
ess
o
f
m
ak
in
g
an
in
i
tial
r
e
p
o
r
t
u
p
o
n
th
e
p
r
o
ac
t
iv
e
in
v
esti
g
ati
o
n
ac
tiv
iti
es
th
at
h
a
v
e
b
ee
n
c
o
n
d
u
cte
d
.
6)
Seiz
e:
T
h
e
f
o
r
e
cl
o
s
u
r
e
p
r
o
ce
s
s
t
o
w
ar
d
s
th
e
d
ig
i
tal
ev
i
d
en
ce
t
h
at
h
as
b
ee
n
f
o
u
n
d
t
o
f
u
r
th
e
r
b
e
an
aly
ze
d
.
7)
T
r
an
s
p
o
r
tat
io
n
:
R
e
p
r
esen
ts
th
e
r
em
o
v
al
p
r
o
ce
s
s
o
f
d
ig
it
al
e
v
id
en
c
e
f
r
o
m
th
e
s
c
en
e
o
f
th
e
m
atter
to
w
ar
d
s
f
o
r
en
s
ic
d
ig
ital
l
ab
o
r
a
to
r
y
.
T
h
e
lab
o
r
ato
r
y
p
r
o
ce
s
s
i
s
t
h
e
p
r
o
ce
s
s
o
f
an
al
y
zi
n
g
th
e
d
at
a
ag
ai
n
s
t
t
h
e
p
r
ev
io
u
s
e
v
id
en
ce
in
t
h
e
lab
o
r
ato
r
y
s
o
th
at
t
h
e
k
in
d
o
f
c
r
i
m
es t
h
at
h
a
v
e
o
cc
u
r
r
ed
ca
n
b
e
f
o
u
n
d
.
1
.
1
.
N
o
t
i
f
i
c
a
t
i
o
n
1
.
2
.
A
u
t
h
o
r
i
z
a
t
i
o
n
1
.
3
.
P
r
e
p
a
r
a
t
i
o
n
1
.
P
r
e
p
a
r
a
t
i
o
n
2
.
I
n
c
i
d
e
n
t
R
e
s
p
o
n
s
e
2
.
1
.
S
e
c
u
r
i
n
g
T
h
e
S
c
e
n
e
2
.
2
.
D
o
c
u
m
e
n
t
a
t
i
o
n
T
h
e
S
c
e
n
e
2
.
3
.
E
v
e
n
t
T
r
i
g
e
r
i
n
g
2
.
4
.
P
r
o
a
c
t
i
v
e
P
r
e
s
e
r
v
a
t
i
o
n
2
.
4
.
1
.
N
e
t
w
o
r
k
T
r
a
c
e
2
.
4
.
2
.
P
l
u
g
I
n
P
o
r
t
a
b
l
e
P
o
w
e
r
S
u
p
l
y
2
.
4
.
3
.
C
o
m
m
u
n
i
c
a
t
i
o
n
S
h
i
e
l
d
i
n
g
2
.
4
.
4
.
V
o
l
a
t
i
l
e
E
v
i
d
e
n
c
e
2
.
4
.
5
.
N
o
n
V
o
l
a
t
i
l
e
E
v
i
d
e
n
c
e
2
.
5
.
1
.
D
e
t
e
c
t
i
o
n
o
f
I
n
c
i
d
e
n
t
/
C
r
i
m
e
2
.
5
.
3
.
P
r
e
l
a
m
i
n
a
r
y
R
e
p
o
r
t
2
.
5
.
2
.
A
c
q
u
i
c
i
t
i
o
n
2
.
6
.
S
e
i
z
e
2
.
7
.
T
r
a
n
s
p
o
r
t
a
t
i
o
n
2
.
5
.
P
r
o
a
c
t
i
v
e
A
n
a
l
y
s
i
s
D
e
v
i
c
e
O
n
?
Y
e
s
N
o
3
.
L
a
b
o
r
a
t
o
r
i
u
m
P
r
o
c
e
s
s
3
.
1
.
1
.
A
c
q
u
i
s
i
t
i
o
n
3
.
1
.
2
.
S
t
o
r
a
g
e
3
.
4
.
D
o
c
u
m
e
n
t
a
t
i
o
n
3
.
3
.
A
n
a
l
y
s
i
s
3
.
2
.
E
x
a
m
i
n
a
t
i
o
n
4
.
1
.
C
o
n
c
l
u
t
i
o
n
4
.
2
.
R
e
c
o
n
t
r
u
c
t
i
o
n
4
.
3
.
D
i
s
s
e
m
i
n
a
t
i
o
n
4
.
P
r
e
s
e
n
t
a
t
i
o
n
3
.
1
.
P
r
e
s
e
r
v
a
t
i
o
n
D
e
v
i
c
e
C
a
n
B
e
A
c
q
u
i
c
i
t
i
o
n
?
Y
e
s
N
o
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
0
8
8
-
8708
I
J
E
C
E
Vo
l.
7
,
No
.
5
,
Octo
b
er
2
0
1
7
:
2
8
0
6
–
2
8
1
7
2812
1)
Pre
s
er
v
a
ti
o
n
:
Pre
s
e
r
v
e
th
e
in
te
g
r
ity
o
f
f
in
d
in
g
s
u
s
in
g
a
h
ash
i
n
g
f
u
n
ctio
n
an
d
ch
a
in
cu
s
t
o
d
y
.
2)
E
x
am
in
atio
n
:
T
h
e
p
r
o
c
ess
in
g
o
f
ev
i
d
en
ce
t
o
f
in
d
its
r
ela
ti
o
n
s
h
ip
w
ith
g
en
esis
.
3)
A
n
al
y
s
is
:
T
e
ch
n
ica
l s
tu
d
i
es
an
d
s
tr
in
g
th
e
lin
k
am
o
n
g
th
e
f
in
d
in
g
s
.
4)
Do
cu
m
en
tati
o
n
:
T
h
e
d
o
cu
m
en
t
ati
o
n
o
f
all
a
ctiv
i
ties
th
a
t
h
av
e
b
e
en
d
o
n
e
f
r
o
m
th
e
b
e
g
in
n
in
g
o
f
th
e
in
v
esti
g
ati
o
n
p
r
o
ce
s
s
u
n
til
th
e
en
d
o
f
th
e
an
aly
s
is
p
r
o
ce
s
s
in
t
h
e
la
b
o
r
at
o
r
y
.
P
r
esen
tatio
n
i
s
t
h
e
p
r
o
ce
s
s
o
f
m
ak
in
g
r
ep
o
r
ts
r
elate
d
to
th
e
a
n
al
y
s
i
s
r
esu
lts
co
n
d
u
cted
i
n
t
h
e
p
r
ev
io
u
s
st
ag
e
a
n
d
to
en
s
u
r
e
th
at
ea
c
h
p
r
o
ce
s
s
h
as b
ee
n
co
n
d
u
cted
in
ac
co
r
d
an
ce
w
it
h
th
e
r
u
les o
f
t
h
e
ap
p
licab
le
la
w
.
1)
C
o
n
clu
s
i
o
n
: Su
m
m
in
g
u
p
th
e
r
esu
lts
o
f
th
e
in
v
esti
g
at
io
n
s
th
at
h
av
e
b
ee
n
c
o
n
d
u
c
te
d
.
2)
R
ec
o
n
s
t
r
u
c
ti
o
n
: A
n
aly
s
is
p
r
o
c
ess
an
d
ev
alu
ati
o
n
o
n
th
e
o
v
e
r
all
in
v
esti
g
a
ti
o
n
r
esu
lts
.
3)
Dis
s
em
in
atio
n
:
T
h
e
r
e
co
r
d
in
g
p
r
o
ce
s
s
o
f
in
q
u
i
r
y
an
d
n
o
t
es
th
at
ca
n
b
e
s
h
a
r
e
d
o
n
o
th
e
r
in
v
es
tig
at
o
r
s
w
h
o
d
o
in
v
esti
g
ati
o
n
s
o
n
s
im
ilar
ca
s
es
.
4
.
5
.
Sta
g
e
5
o
f
SS
M
:
Co
m
pa
ra
t
io
n o
f
M
o
del a
nd
Rea
l Wo
rld
T
h
e
n
ex
t
s
tag
e
is
th
e
p
r
o
ce
s
s
o
f
co
m
p
a
r
in
g
a
co
n
ce
p
tu
al
m
o
d
el
to
s
u
it
w
i
th
t
h
e
s
itu
a
tio
n
o
f
th
e
p
r
o
b
lem
at
th
e
m
o
m
en
t (
t
h
e
r
ea
l
w
o
r
ld
)
.
T
h
is
ca
n
b
e
s
ee
n
i
n
T
ab
le
2
.
T
ab
le
2
.
C
o
m
p
ar
is
o
n
o
f
th
e
co
n
ce
p
tu
al
m
o
d
el
an
d
r
ea
l a
ctiv
i
ties
I
D
F
I
F
M
o
d
e
l
R
e
a
l
A
c
t
i
v
i
t
y
R
e
c
o
mm
e
n
d
a
t
i
o
n
N
o
t
i
f
i
c
a
t
i
o
n
Y
e
s
-
A
u
t
h
o
r
i
z
a
t
i
o
n
Y
e
s
-
P
r
e
p
a
r
a
t
i
o
n
Y
e
s
T
h
e
a
d
d
i
t
i
o
n
o
f
t
h
e
d
e
c
i
s
i
o
n
p
r
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c
e
ss o
f
t
h
e
i
n
v
e
st
i
g
a
t
i
o
n
h
a
n
d
l
i
n
g
t
o
b
e
c
o
n
d
u
c
t
e
d
.
S
e
c
u
r
i
n
g
t
h
e
S
c
e
n
e
Y
e
s
-
D
o
c
u
me
n
t
a
t
i
o
n
o
f
t
h
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c
e
n
e
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e
s
-
Ev
e
n
t
T
r
i
g
g
e
r
i
n
g
Y
e
s
-
P
r
o
a
c
t
i
v
e
P
r
e
se
r
v
a
t
i
o
n
Y
e
s
T
h
e
a
d
d
i
t
i
o
n
o
f
t
h
e
d
e
c
i
s
i
o
n
p
r
o
c
e
ss a
n
a
l
y
si
s o
f
e
v
i
d
e
n
c
e
t
h
a
t
h
a
v
e
b
e
e
n
d
i
s
c
o
v
e
r
e
d
.
P
r
o
a
c
t
i
v
e
A
n
a
l
y
si
s
Y
e
s
-
S
e
i
z
e
Y
e
s
-
T
r
a
n
sp
o
r
t
a
t
i
o
n
Y
e
s
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h
e
a
d
d
i
t
i
o
n
o
f
t
h
e
d
e
c
i
s
i
o
n
p
r
o
c
e
ss t
h
e
h
a
n
d
l
i
n
g
o
f
d
i
g
i
t
a
l
e
v
i
d
e
n
c
e
t
o
t
h
e
n
e
x
t
st
a
g
e
.
P
r
e
serv
a
t
i
o
n
Y
e
s
T
h
e
a
d
d
i
t
i
o
n
o
f
t
h
e
d
e
c
i
s
i
o
n
p
r
o
c
e
ss t
h
e
h
a
n
d
l
i
n
g
o
f
e
v
i
d
e
n
c
e
t
y
p
e
.
Ex
a
mi
n
a
t
i
o
n
Y
e
s
-
A
n
a
l
y
si
s
Y
e
s
-
D
o
c
u
me
n
t
a
t
i
o
n
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e
s
-
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o
n
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l
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s
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o
n
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-
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c
o
n
st
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c
t
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Y
e
s
-
D
i
sse
mi
n
a
t
i
o
n
Y
e
s
-
4
.
6
.
Sta
g
e
6
o
f
SS
M
:
Cha
ng
e
Sy
s
t
e
m
a
t
ica
lly
Desira
ble a
n
d Cult
ura
lly
F
ea
s
ibl
e
T
h
e
n
ex
t
p
r
o
ce
s
s
is
to
d
eter
m
i
n
e
th
e
r
es
u
lt
s
o
f
i
m
p
r
o
v
e
m
en
t
b
ased
o
n
th
e
r
ec
o
m
m
e
n
d
atio
n
s
t
h
at
h
av
e
b
ee
n
s
p
ec
if
ied
i
n
th
e
p
r
e
v
io
u
s
s
ta
g
e
an
d
it
ca
n
b
e
s
ee
n
in
T
ab
le
3
.
T
ab
le
3
.
T
h
e
R
esu
lt
s
o
f
t
h
e
R
e
co
m
m
e
n
d
atio
n
o
n
I
D
FIF
R
ep
a
ir
in
g
I
D
F
I
F
M
o
d
e
l
R
e
c
o
mm
e
n
d
a
t
i
o
n
R
e
p
a
i
r
P
r
e
p
a
r
a
t
i
o
n
T
h
e
a
d
d
i
t
i
o
n
o
f
t
h
e
d
e
c
i
s
i
o
n
p
r
o
c
e
ss o
f
t
h
e
i
n
v
e
st
i
g
a
t
i
o
n
h
a
n
d
l
i
n
g
t
o
b
e
c
o
n
d
u
c
t
e
d
.
T
h
e
d
e
c
i
si
o
n
p
r
o
c
e
ss o
n
t
h
e
i
n
v
e
st
i
g
a
t
i
o
n
h
a
n
d
l
i
n
g
t
o
b
e
c
o
n
d
u
c
t
e
d
.
P
r
o
a
c
t
i
v
e
P
r
e
serv
a
t
i
o
n
T
h
e
a
d
d
i
t
i
o
n
o
f
t
h
e
d
e
c
i
s
i
o
n
p
r
o
c
e
ss a
n
a
l
y
si
s
o
f
t
h
e
e
v
i
d
e
n
c
e
t
h
a
t
h
a
v
e
b
e
e
n
d
i
sco
v
e
r
e
d
.
T
h
e
d
e
c
i
si
o
n
p
r
o
c
e
ss
a
n
a
l
y
si
s o
f
e
v
i
d
e
n
c
e
t
h
a
t
h
a
v
e
b
e
e
n
d
i
s
c
o
v
e
r
e
d
.
T
r
a
n
sp
o
r
t
a
t
i
o
n
T
h
e
a
d
d
i
t
i
o
n
o
f
t
h
e
d
e
c
i
s
i
o
n
p
r
o
c
e
ss
of
t
h
e
d
i
g
i
t
a
l
e
v
i
d
e
n
c
e
h
a
n
d
l
i
n
g
t
o
t
h
e
n
e
x
t
s
t
a
g
e
.
T
h
e
d
e
c
i
si
o
n
p
r
o
c
e
ss
t
h
e
h
a
n
d
l
i
n
g
o
f
d
i
g
i
t
a
l
e
v
i
d
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n
c
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t
o
t
h
e
n
e
x
t
s
t
a
g
e
.
P
r
e
serv
a
t
i
o
n
T
h
e
a
d
d
i
t
i
o
n
o
f
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d
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c
i
s
i
o
n
p
r
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c
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ss
o
f
t
h
e
e
v
i
d
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n
c
e
t
y
p
e
h
a
n
d
l
i
n
g
.
T
h
e
d
e
c
i
si
o
n
p
r
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c
e
ss
t
h
e
h
a
n
d
l
i
n
g
o
f
d
i
g
i
t
a
l
e
v
i
d
e
n
c
e
t
y
p
e
.
4
.
7
.
Sta
g
e
7
o
f
SS
M
:
Act
io
n t
o
I
m
pro
v
e
t
he
P
ro
ble
m
S
it
u
a
t
io
n
B
ased
o
n
th
e
r
ec
o
m
m
en
d
atio
n
s
o
f
i
m
p
r
o
v
e
m
e
n
ts
o
n
th
e
p
r
ev
io
u
s
s
ta
g
e,
f
o
u
r
d
ec
is
io
n
p
r
o
ce
s
s
es
f
o
r
h
an
d
li
n
g
th
e
d
i
g
ital
e
v
id
e
n
ce
is
ad
d
ed
o
n
I
DFI
F
v
2
s
ta
g
e.
I
t
is
n
ec
e
s
s
ar
y
to
m
a
k
e
I
DFI
F
v
2
to
b
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o
m
e
m
o
r
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le
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ap
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ig
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ev
id
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s
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ased
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.
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DFI
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in
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2813
Fig
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I
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5.
DIS
CU
SS
I
O
N
5
.
1
.
Ca
s
e
Study
T
h
e
d
ig
ital
ev
id
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h
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d
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p
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ar
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y
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s
i
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I
D
FIF
v
1
an
d
I
DFI
F
v
2
.
C
ase
s
ce
n
ar
io
s
an
d
s
i
m
u
latio
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s
in
th
e
r
esear
ch
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t
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s
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s
h
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t
m
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a
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v
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(
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an
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ac
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d
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an
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p
o
r
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n
.
1)
Secu
r
in
g
t
h
e
Sc
en
e
is
a
s
te
p
th
at
m
u
s
t
b
e
d
o
n
e
in
th
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im
p
lem
en
tati
o
n
o
f
th
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up
p
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tin
g
s
ce
n
e
is
k
e
ep
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g
th
e
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ce
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e
f
r
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m
p
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p
l
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w
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h
av
e
an
y
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ter
est
in
th
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in
v
es
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ati
o
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p
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o
ce
s
s
s
o
th
at
th
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in
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eg
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ity
o
f
d
ig
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tal
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id
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b
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au
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en
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lly
g
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an
te
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.
2)
Do
cu
m
en
tati
o
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f
th
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Sc
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th
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d
o
cu
m
en
tatio
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s
s
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m
es
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p
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te
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e
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f
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3)
T
h
e
E
v
en
t
T
r
ig
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in
g
is
th
e
b
e
g
in
n
in
g
o
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aly
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ce
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s
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e
ev
en
ts
th
a
t h
av
e
o
cc
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r
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ce
n
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.
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f
ter
s
ec
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in
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th
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ce
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in
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tig
at
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c
o
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d
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cts
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in
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aly
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ag
ain
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t
a
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as
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ap
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d
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th
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c
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an
d
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ea
r
ch
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ig
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ev
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6
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s
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au
d
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t
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4)
Pro
ac
tiv
e
P
r
ese
r
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at
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n
is
th
e
p
r
o
ce
s
s
o
f
s
e
cu
r
in
g
S
m
ar
tp
h
o
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ev
i
d
en
c
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th
at
h
av
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b
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f
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n
d
at
th
e
s
c
en
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o
f
th
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m
atter
s
o
th
at
th
e
in
teg
r
ity
o
f
th
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d
a
ta
th
at
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esi
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o
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Sm
ar
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p
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r
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tay
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a
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aly
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is
p
r
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5)
P
lu
g
in
Po
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ta
b
le
Po
w
er
Su
p
p
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y
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a
ch
ar
g
in
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p
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o
ce
s
s
ag
a
in
s
t
Sm
ar
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p
h
o
n
e
ev
i
d
en
c
e
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s
in
g
a
p
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ta
b
l
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p
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u
p
p
ly
b
ec
au
s
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o
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th
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b
at
te
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p
o
w
er
c
o
n
d
iti
o
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o
n
th
e
Sm
ar
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p
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o
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e
.
It
is
f
o
u
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d
n
o
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alw
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in
f
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ll
co
n
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iti
o
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ch
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p
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ess
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y
u
s
in
g
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p
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p
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u
p
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ly
to
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ain
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c
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d
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ti
o
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f
th
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s
m
ar
t
p
h
o
n
e
to
b
e
in
an
"o
n
"
s
ta
te
u
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til
it g
o
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t
o
th
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d
ig
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tal
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la
b
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ato
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6)
C
o
m
m
u
n
icati
o
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Sh
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el
d
in
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is
a
s
tag
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o
f
s
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u
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Sm
ar
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m
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a
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ex
ch
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tely
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.
7)
Seiz
e
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th
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f
o
r
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cl
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s
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r
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p
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s
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f
Sm
ar
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p
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s
ev
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l
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8)
T
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p
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c
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f
t
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p
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tati
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ar
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co
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tely
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en
ce
in
teg
r
ity
.
T
h
e
n
ex
t
s
tag
e
is
l
ab
o
r
at
o
r
y
p
r
o
ce
s
s
th
a
t
is
th
e
s
m
ar
tp
h
o
n
e
r
ev
i
ew
p
r
o
c
ess
in
d
ig
ita
l
f
o
r
en
s
i
cs
lab
o
r
a
to
r
y
.
T
h
e
s
t
ag
e
o
f
th
e
r
ev
iew
p
r
o
c
ess
is
d
o
n
e
in
d
ig
i
tal
f
o
r
en
s
ic
l
ab
o
r
at
o
r
y
,
p
r
es
e
r
v
atio
n
,
ac
q
u
is
it
io
n
,
s
to
r
ag
e
,
ex
am
in
atio
n
,
an
aly
s
is
an
d
d
o
cu
m
en
tati
o
n
.
1)
Pre
s
er
v
a
ti
o
n
is
th
e
p
r
o
ce
s
s
o
f
s
ec
u
r
in
g
Sm
ar
tp
h
o
n
e
ev
id
e
n
ce
.
T
h
e
Sm
ar
tp
h
o
n
e
c
o
n
d
i
ti
o
n
w
h
en
in
th
e
p
r
o
ce
s
s
o
f
ac
q
u
is
i
ti
o
n
s
h
o
u
ld
b
e
in
a
d
is
c
o
n
n
ec
t
e
d
s
t
at
e
f
r
o
m
ex
is
tin
g
d
at
a
c
o
m
m
u
n
icati
o
n
s
.
2)
A
cq
u
is
iti
o
n
is
th
e
f
i
r
s
t
th
in
g
t
h
at
m
u
s
t
b
e
d
o
n
e
in
th
e
la
b
o
r
ato
r
y
o
f
d
ig
it
al
f
o
r
en
s
ic
t
o
w
ar
d
s
Sm
ar
t
p
h
o
n
e
s
o
f
tw
ar
e
th
a
t
h
as
b
e
en
f
o
u
n
d
o
n
th
e
s
ce
n
e
o
f
th
in
g
s
.
3)
E
v
id
en
ce
St
o
r
ag
e
is
th
e
p
r
o
ce
s
s
o
f
s
t
o
r
in
g
Sm
ar
t
p
h
o
n
e
ev
i
d
en
ce
t
o
a
d
ete
r
m
in
ed
p
lac
e.
T
h
e
f
o
r
m
an
d
th
e
co
n
t
en
t
o
f
th
e
d
ig
ital
ev
id
en
ce
m
u
s
t
b
e
k
e
p
t
in
a
s
te
r
il
e
p
l
ac
e
t
o
en
s
u
r
e
th
a
t
th
e
r
e
is
n
o
ch
an
g
e
.
T
h
is
is
v
er
y
n
o
tew
o
r
th
y
b
ec
au
s
e
a
s
lig
h
t
c
h
an
g
e
in
th
e
d
ig
it
al
ev
i
d
en
ce
co
u
l
d
im
p
ac
t
th
e
in
v
esti
g
a
ti
o
n
r
esu
lts
.
D
ig
ita
l
ev
id
en
ce
is
n
a
tu
r
a
lly
to
b
e
tem
p
o
r
ar
y
(
v
o
lat
ile
)
,
s
o
if
it
is
n
o
t
ac
cu
r
a
te
,
i
t
w
ill
b
e
v
e
r
y
ea
s
ily
d
am
ag
ed
,
lo
s
t,
alte
r
e
d
,
o
r
ex
p
er
ien
c
e
an
a
cc
id
en
t.
4)
T
h
e
E
x
am
in
atio
n
is
th
e
p
r
o
ce
s
s
o
f
p
r
o
ce
s
s
in
g
d
ig
ita
l
ev
i
d
en
ce
to
f
in
d
th
e
r
ela
ti
o
n
s
h
ip
w
it
h
th
e
cr
im
e
th
a
t
h
as b
ee
n
d
o
n
e
b
y
th
e
o
f
f
en
d
e
r
ag
ain
s
t
th
e
v
i
ctim
s
.
5)
A
n
al
y
s
is
i
s
th
e
p
r
o
c
ess
o
f
t
ec
h
n
ical
s
tu
d
i
es
in
th
e
ex
am
in
atio
n
o
f
s
m
ar
t
p
h
o
n
e
ev
i
d
en
c
e
an
d
co
n
s
t
r
u
ct
in
g
th
e
lin
k
am
o
n
g
th
e
f
in
d
in
g
s
.
A
f
ter
g
ett
in
g
th
e
ex
p
e
cte
d
f
iles
o
r
d
ig
ital
d
at
a
f
r
o
m
th
e
r
ev
iew
p
r
o
ce
s
s
,
th
e
d
a
ta
is
th
en
an
aly
ze
d
in
d
et
ail
an
d
co
m
p
r
eh
en
s
iv
ely
p
r
o
ve
th
e
o
cc
u
r
r
e
d
c
r
im
e
an
d
w
h
at
to
d
o
b
y
th
e
p
er
p
etr
at
o
r
s
o
f
th
e
c
r
im
e.
T
h
e
an
aly
s
is
r
esu
lts
o
f
th
e
d
ig
ita
l
d
at
a
k
n
o
w
n
as
th
e
d
ig
ita
l
ev
id
en
ce
th
at
s
h
o
u
l
d
b
e
s
cien
tif
i
ca
l
ly
j
u
s
tif
i
ed
in
th
e
l
aw
in
th
e
co
u
r
ts
.
I
n
s
o
m
e
ca
s
es
it
is
f
r
eq
u
en
tly
r
e
q
u
ir
e
d
t
h
e
c
o
ll
ec
ti
o
n
o
f
p
h
y
s
ical
ev
i
d
en
c
e
an
d
lo
g
i
ca
l
f
o
r
m
o
f
th
e
ek
s
tak
s
i
d
at
a
.
Yet
in
th
is
c
ase
,
th
e
r
e
q
u
i
r
e
d
ev
i
d
e
n
ce
is
s
im
p
ly
a
r
e
co
r
d
o
f
o
u
tg
o
in
g
an
d
in
c
o
m
in
g
ca
lls
as
w
ell
as
o
u
tg
o
i
n
g
an
d
in
co
m
in
g
SMS
l
o
ca
t
e
d
in
th
e
in
te
r
n
al
s
to
r
ag
e
o
f
a
s
m
ar
tp
h
o
n
e
.
T
h
e
o
f
f
en
d
er
n
o
tif
i
es th
e
p
o
t
en
ti
al
v
i
ctim
s
th
at
w
er
e
t
o
l
d
w
in
a
c
ar
u
n
it.
A
s
f
o
r
th
e
m
ess
ag
e
s
en
t
b
y
th
e
p
e
r
p
e
tr
at
o
r
ca
n
b
e
s
ee
n
in
Fig
u
r
e
8
.
Fig
u
r
e
8
.
P
r
o
o
f
o
f
SMS f
r
a
u
d
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