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1018
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will
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K
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CC B
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C
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p
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A
uth
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:
Hu
s
s
am
J
.
Ali
Dep
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tm
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[
1
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.
T
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ea
ts
af
f
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th
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in
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r
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So
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1019
p
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[
4
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wh
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p
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a
b
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[
2
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[
5
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T
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th
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af
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tio
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s
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as
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p
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p
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d
esig
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a
d
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tier
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m
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d
el
f
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r
lo
ca
lly
ap
p
licatio
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at
Fallu
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Dam
S
tatio
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/An
b
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Go
v
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n
o
r
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r
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q
;
ii)
im
p
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en
tes
th
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d
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ch
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cr
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Acc
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ly
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ec
h
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s
.
R
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in
[
6
]
,
[
7
]
s
h
o
w
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th
at
it
tak
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less
tim
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to
en
cr
y
p
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m
p
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a
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T
wo
f
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alg
o
r
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m
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a
2
4
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KB
tex
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with
an
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Ser
p
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s
p
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p
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[
6
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,
w
h
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g
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s
p
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cr
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p
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d
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with
th
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s
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[
8
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.
T
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ata
en
cr
y
p
tio
n
m
eth
o
d
will
b
e
ad
o
p
ted
in
th
is
wo
r
k
b
y
ap
p
ly
in
g
th
e
AE
S
alg
o
r
ith
m
an
d
2
5
6
-
b
it
s
ize
d
er
iv
ed
k
e
y
with
th
e
s
u
g
g
esti
o
n
o
f
ad
d
in
g
a
d
y
n
am
ic
r
an
d
o
m
s
alt
m
eth
o
d
to
th
e
cip
h
er
tex
t
an
d
th
e
u
s
ef
u
ln
ess
o
f
th
e
p
r
o
p
o
s
ed
m
et
h
o
d
is
to
g
iv
e
d
if
f
er
en
t
e
n
cr
y
p
tio
n
r
esu
lt
ev
er
y
tim
e
with
s
am
e
p
lain
tex
t,
also
to
ea
s
y
r
e
tr
iv
in
g
d
ata
e
n
cr
y
p
ted
f
o
r
m
d
a
tab
ase
an
d
p
e
r
f
o
r
m
th
is
wo
r
k
o
n
p
r
o
p
o
s
ed
Dam
s
d
ata
m
an
ag
em
e
n
t
s
y
s
tem
,
with
th
e
im
p
lem
e
n
tatio
n
o
f
p
r
ac
t
ical
ex
p
er
im
en
ts
lin
k
ed
to
C
B
C
cip
h
er
m
o
d
e
,
in
co
m
p
ar
is
o
n
with
s
ev
e
r
al
alg
o
r
ith
m
s
u
n
d
er
s
p
ec
if
ic
c
o
n
d
itio
n
s
.
2.
B
ACK
G
RO
UND
T
h
is
s
ec
tio
n
r
ev
iews
in
th
e
f
ir
s
t
s
u
b
s
ec
tio
n
s
ev
er
a
l
o
f
th
e
r
e
lated
wo
r
k
s
to
d
am
s
’
d
ata
m
a
n
ag
em
en
t,
an
d
th
e
tr
ad
itio
n
al
m
ec
h
an
is
m
s
an
d
th
eir
ef
f
ec
tiv
en
ess
,
b
esid
e
th
e
m
eth
o
d
s
th
at
h
av
e
b
ee
n
r
ev
iewe
d
in
en
cr
y
p
tin
g
th
e
d
ata.
T
h
e
s
ec
o
n
d
s
u
b
s
ec
tio
n
in
v
esti
g
ates
th
e
ca
s
e
s
tu
d
y
o
f
I
r
aq
i
d
a
m
s
(
Fallu
jah
d
am
)
,
id
en
tify
in
g
th
e
c
u
r
r
en
t
d
e
f
icien
cies
in
d
am
m
an
ag
em
en
t
in
I
r
aq
,
an
d
ca
r
r
y
in
g
o
u
t
th
e
in
v
es
tig
atio
n
to
g
eth
er
t
o
r
ed
ef
in
e
th
e
ad
eq
u
ate
tech
n
ical
an
d
s
ec
u
r
ity
m
ec
h
a
n
is
m
s
n
ec
ess
ar
y
to
ac
h
iev
e
i
n
teg
r
atio
n
an
d
in
f
o
r
m
ati
o
n
s
ec
u
r
ity
.
2
.
1
.
Rela
t
ed
wo
rk
s
R
esear
ch
er
s
in
[
9
]
h
av
e
d
ev
el
o
p
ed
a
C
L
PIM
S
C
h
in
a
d
am
p
r
o
ject
in
f
o
r
m
atio
n
m
an
ag
e
m
e
n
t
s
y
s
tem
,
wh
ich
is
b
ased
o
n
W
eb
GI
S
a
n
d
r
elies
o
n
a
m
u
lti
-
tier
s
tr
u
ctu
r
e
in
b
r
o
wser
/s
er
v
er
m
o
d
e
to
en
ter
d
ata
f
o
r
d
am
m
an
ag
er
s
with
SS
L
en
cr
y
p
tio
n
.
T
h
e
s
y
s
tem
is
b
ased
o
n
a
c
o
m
b
in
atio
n
o
f
SQL
Ser
v
er
d
a
tab
ase
an
d
s
to
r
ag
e
m
o
d
el
Ar
cSDE
d
ata
f
o
r
r
ap
id
s
to
r
ag
e
o
f
la
r
g
e
am
o
u
n
t o
f
c
o
m
p
lex
d
ata
t
y
p
es
o
b
tain
e
d
th
r
o
u
g
h
th
e
ap
p
licatio
n
o
f
Activ
e
Ser
v
er
Pag
es
tech
n
o
lo
g
y
to
ac
h
ie
v
e
c
o
m
p
r
e
h
e
n
s
iv
e
ce
n
tr
al
m
an
a
g
em
en
t.
Ho
we
v
er
,
with
th
is
im
p
o
r
tan
t w
o
r
k
,
th
e
d
ev
elo
p
er
s
d
id
n
o
t f
o
cu
s
o
n
is
s
u
es o
f
s
ec
u
r
in
g
u
s
er
d
ata
p
r
o
tectio
n
,
d
a
tab
ase
en
cr
y
p
tio
n
.
Als
o
,
a
web
-
b
ased
ap
p
licatio
n
h
as
d
e
v
elo
p
ed
b
y
au
th
o
r
s
in
[
1
0
]
a
with
a
r
elatio
n
al
d
atab
as
e
f
o
r
r
ea
l
-
tim
e
d
am
m
a
n
ag
em
e
n
t
u
n
d
er
th
e
co
n
d
itio
n
s
o
f
wea
th
er
,
r
i
v
er
f
lo
w,
an
d
wate
r
tem
p
e
r
at
u
r
e.
T
h
e
d
esig
n
e
d
s
y
s
tem
h
as
p
r
ed
icted
th
e
f
o
r
ec
asts
o
f
wate
r
tem
p
e
r
atu
r
e
an
d
r
ain
f
all
b
y
u
s
in
g
a
d
ata
m
i
n
in
g
ap
p
r
o
ac
h
in
r
ea
l
-
tim
e
ap
p
licatio
n
.
Ho
wev
e
r
,
n
o
s
ec
u
r
ity
p
ar
am
eter
s
h
a
v
e
b
ee
n
co
n
s
id
er
e
d
to
p
r
o
tect
th
e
d
at
a
ce
n
ter
.
I
n
th
is
p
ap
er
[
1
1
]
,
a
web
-
b
ased
clien
t
-
s
er
v
er
s
y
s
tem
is
p
r
o
p
o
s
ed
,
in
wh
ich
t
h
e
d
ata
is
en
cr
y
p
ted
u
s
in
g
AE
S
with
2
5
6
k
ey
s
,
th
e
r
esear
ch
s
o
lv
ed
th
e
p
r
o
b
le
m
o
f
o
r
g
a
n
izatio
n
s
lo
s
in
g
th
e
ir
s
en
s
itiv
e
d
ata
t
o
u
n
au
th
o
r
ized
p
eo
p
le
.
So
,
th
e
a
u
th
o
r
s
will
p
r
o
p
o
s
e
a
h
y
b
r
id
e
n
cr
y
p
tio
n
p
atter
n
to
s
u
p
p
o
r
t
a
p
r
iv
ate
k
e
y
cip
h
e
r
s
y
s
tem
th
at
is
a
co
m
b
i
n
atio
n
o
f
AE
C
a
n
d
E
C
C
with
1
9
2
-
b
it
k
ey
s
ize
an
d
1
2
r
o
u
n
d
s
,
t
h
u
s
in
cr
ea
s
in
g
th
e
o
v
er
all
s
ec
u
r
ity
o
f
th
e
s
y
s
tem
b
y
im
p
lem
e
n
tin
g
s
o
f
tw
ar
e
-
b
ased
c
o
u
n
ter
m
ea
s
u
r
e
s
t
o
p
r
ev
en
t
p
o
s
s
ib
le
v
u
ln
er
ab
ilit
ies
th
at
it
p
o
s
es
T
im
in
g
s
id
e
-
ch
a
n
n
el
attac
k
[
1
2
]
.
T
h
is
p
ap
e
r
[
1
3
]
p
r
esen
tes
d
a
ta
en
cr
y
p
tio
n
u
s
in
g
th
e
AE
S
alg
o
r
ith
m
an
d
a
2
5
6
-
b
it
k
ey
with
m
ix
in
g
s
alt
v
alu
es
r
esu
ltin
g
f
r
o
m
th
e
d
y
n
a
m
ic
g
en
er
atio
n
an
d
m
er
g
in
g
th
e
m
with
th
e
p
lain
tex
t
b
ef
o
r
e
th
e
en
c
r
y
p
tio
n
p
r
o
ce
s
s
,
as
s
h
o
wn
in
Fig
u
r
e
1
,
wh
er
e
an
lin
ea
r
co
n
g
r
u
en
tial
g
en
e
r
ato
r
(
L
C
G
)
is
u
s
ed
to
g
en
er
ate
r
an
d
o
m
v
alu
es.
I
n
th
e
p
r
ac
tical
ex
p
e
r
i
m
en
t,
th
e
p
r
o
p
o
s
ed
m
eth
o
d
is
u
s
ed
with
a
m
a
x
im
u
m
o
f
3
0
c
h
ar
ac
ter
s
,
an
d
a
lar
g
er
s
ize
o
f
th
e
v
alu
es
is
n
o
t
a
p
p
lied
.
On
th
e
o
th
er
h
an
d
,
th
e
r
esear
ch
er
d
o
es n
o
t
ex
p
lain
th
e
m
eth
o
d
o
f
s
to
r
in
g
s
alt
v
alu
es wh
en
en
cr
y
p
tin
g
la
r
g
e
d
ata
an
d
s
to
r
in
g
th
em
in
d
atab
ases
,
an
d
th
e
m
eth
o
d
f
o
r
r
etr
iev
in
g
s
alt
v
alu
es
an
d
d
ec
r
y
p
t
d
ata
f
o
r
an
y
r
o
w
in
th
e
d
atab
ase
later
.
2
.
2
.
Ca
s
e
s
t
ud
y
:
F
a
llu
j
a
h da
m
T
h
r
o
u
g
h
th
e
p
ilo
t
s
tu
d
y
,
will
s
h
ed
lig
h
t o
n
t
h
e
cu
r
r
en
t
s
itu
atio
n
o
f
th
e
Fallu
jah
d
am
o
n
th
e
E
u
p
h
r
ates
R
iv
er
,
wh
ich
is
lo
ca
ted
in
An
b
ar
G
o
v
er
n
o
r
ate,
t
o
cla
r
if
y
th
e
tech
n
ical,
o
r
g
a
n
izatio
n
al,
an
d
s
ec
u
r
ity
ch
allen
g
es.
I
t
is
o
b
s
er
v
ed
th
a
t
4
5
(
m
an
ag
e
r
s
,
d
ep
ar
tm
e
n
ts
m
an
ag
er
s
,
en
g
i
n
ee
r
s
,
an
d
o
p
e
r
ato
r
s
)
o
f
Fallu
jah
d
am
s
tatio
n
ar
e
in
ter
v
iewe
d
a
n
d
ac
q
u
ir
e
d
to
f
ill
o
u
t
th
e
q
u
esti
o
n
n
air
es.
T
h
ey
f
ac
e
m
a
n
y
tech
n
ical,
s
ec
u
r
ity
,
an
d
o
r
g
an
izatio
n
al
ch
allen
g
es a
s
s
u
m
m
ar
ized
in
T
ab
le
1.
W
h
er
e
th
e
n
u
m
b
e
r
1
r
ep
r
esen
ts
s
tr
o
n
g
ly
d
is
ag
r
ee
,
2
:
d
is
ag
r
ee
,
3
:
m
ed
iu
m
,
4
:
ag
r
ee
,
5
:
s
tr
o
n
g
ly
a
g
r
ee
.
Q
u
esti
o
n
n
a
ir
es
an
d
r
esp
o
n
s
es
wh
ich
a
r
e
a
d
d
r
ess
ed
r
ef
e
r
th
at
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ata
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g
r
atio
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am
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o
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k
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a
n
d
m
an
ag
er
s
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e
s
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te
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e
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s
e
o
f
I
T
s
y
s
tem
s
,
esp
ec
ially
i
n
r
elatio
n
to
d
ata
m
a
n
ag
em
en
t
r
eq
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ir
em
en
ts
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an
d
th
e
s
o
lv
in
g
o
f
th
ese
is
s
u
es.
Fig
u
r
e
1
.
G
e
n
e
ra
l
sy
ste
m
d
e
sig
n
d
y
n
a
m
ic en
c
ry
p
ti
o
n
T
ab
le
1
.
Su
m
m
a
r
y
o
f
h
ig
h
lig
h
ts
ad
d
r
ess
ed
v
ia
th
e
p
ilo
t stu
d
y
in
Fallu
jah
d
am
I
ssu
e
s
Q
u
e
st
i
o
n
1
2
3
4
5
Te
c
h
n
i
c
a
l
i
ssu
e
s
I
s a
sp
e
c
i
a
l
i
n
f
o
r
ma
t
i
o
n
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e
m
u
se
d
t
o
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r
a
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e
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a
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t
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c
h
n
o
l
o
g
y
h
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l
p
o
r
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z
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o
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-
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o
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3.
O
VE
RVI
E
W
O
F
CRYP
T
O
G
RAP
H
Y
C
r
y
p
to
g
r
ap
h
y
is
de
f
in
ed
b
y
W
illi
am
Stalli
n
g
s
a
s
“th
e
ty
p
e
o
f
o
p
er
atio
n
s
u
s
ed
f
o
r
tr
an
s
f
o
r
m
in
g
p
lain
tex
t
to
cip
h
e
r
tex
t,
th
e
n
u
m
b
er
o
f
k
ey
s
u
s
ed
,
a
n
d
th
e
way
in
wh
ich
th
e
p
lain
tex
t
is
p
r
o
ce
s
s
ed
”
[
1
4
]
.
T
h
e
ty
p
es o
f
en
c
r
y
p
tio
n
alg
o
r
ith
m
s
ar
e
d
iv
id
e
d
in
to
s
ev
er
al
g
r
o
u
p
s
[
1
5
]
,
as sh
o
wn
i
n
th
e
Fig
u
r
e
2
.
Fig
u
r
e
2
.
C
r
y
p
to
s
y
s
tem
’
s
class
if
icatio
n
3
.
1
.
Sy
m
m
e
t
ric
blo
ck
cipher
s
B
lo
ck
cip
h
er
co
n
v
er
ts
p
lain
te
x
t
to
a
f
ix
ed
len
g
th
s
ize,
k
n
o
wn
as
th
e
b
lo
ck
s
ize.
I
f
t
h
e
le
n
g
th
o
f
th
e
p
lain
tex
t
is
g
r
ea
ter
th
an
th
e
s
p
ec
if
ied
b
lo
ck
s
ize,
it
is
d
iv
id
ed
in
to
s
ev
er
al
eq
u
al
b
lo
ck
s
.
A
b
lo
ck
cip
h
er
is
b
ased
p
r
im
ar
ily
o
n
a
s
y
m
m
et
r
ic
k
ey
.
T
h
e
s
a
m
e
s
ec
r
et
k
ey
is
u
s
ed
f
o
r
en
cr
y
p
tio
n
a
n
d
d
ec
r
y
p
tio
n
[
7
]
.
T
h
er
e
ar
e
s
ev
er
al
s
y
m
m
etr
ic
b
lo
ck
cip
h
er
alg
o
r
ith
m
s
,
T
DE
S,
R
C
2
,
A
E
S,
T
wo
f
is
h
,
Ser
p
en
t.
T
h
ese
alg
o
r
ith
m
s
wo
r
k
i
n
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
d
o
n
esian
J
E
lec
E
n
g
&
C
o
m
p
Sci
I
SS
N:
2502
-
4
752
Da
ta
s
ec
u
r
ity
u
s
in
g
r
a
n
d
o
m
d
yn
a
mic
s
a
ltin
g
a
n
d
A
E
S
b
a
s
ed
o
n
ma
s
ter
-
s
la
ve
ke
ys fo
r
…
(
Hu
s
s
a
m
J.
A
li
)
1021
d
if
f
er
en
t
o
p
e
r
atin
g
m
o
d
es
i
n
en
cr
y
p
tin
g
ea
c
h
b
l
o
ck
,
th
e
m
o
s
t
f
am
o
u
s
o
f
wh
ich
ar
e:
C
ip
h
e
r
b
l
o
ck
ch
ain
in
g
(
C
B
C
)
,
elec
tr
o
n
ic
co
d
e
b
o
o
k
(
E
C
B
)
,
an
d
cip
h
er
f
ee
d
b
ac
k
(
C
FB
)
I
n
th
is
r
esear
ch
wi
ll
ad
o
p
t
th
e
C
B
C
o
p
er
atin
g
m
o
d
e
with
AE
S
b
ec
au
s
e
it
h
as
a
h
i
g
h
-
p
er
f
o
r
m
an
c
e
s
p
ee
d
co
m
p
ar
e
d
to
with
C
FB
[
8
]
,
e
ac
h
b
lo
c
k
is
also
u
n
iq
u
ely
e
n
cr
y
p
ted
[
1
6
]
,
o
n
th
e
o
th
er
h
a
n
d
,
it is
s
af
er
th
an
E
C
B
[
1
7
]
.
3
.
1
.
1
.
T
riple
DE
S (
T
DE
S)
T
DE
S
is
d
ev
elo
p
ed
to
s
o
lv
e
ap
p
ar
e
n
t
wea
k
n
ess
es
in
DE
S
with
o
u
t
b
u
ild
in
g
a
f
u
lly
n
ew
cr
y
p
to
s
y
s
tem
.
T
h
e
co
n
ce
p
t
o
f
T
DE
S
is
b
ased
o
n
ex
ten
d
i
n
g
th
e
s
ize
o
f
t
h
e
DE
S
k
ey
th
r
ee
t
im
es
b
y
ex
ec
u
tin
g
th
e
alg
o
r
ith
m
i
n
s
er
ies
with
th
r
ee
d
if
f
e
r
en
t
k
e
y
s
[
1
8
]
.
T
h
e
len
g
th
o
f
o
n
e
k
ey
is
5
6
b
its
an
d
th
e
s
u
m
o
f
th
e
len
g
th
o
f
th
e
th
r
ee
k
ey
s
is
1
6
8
b
its
,
T
h
e
g
o
al
o
f
d
ev
el
o
p
in
g
T
DE
S
is
to
war
d
o
f
f
attac
k
s
tar
g
etin
g
DE
S
b
y
g
iv
in
g
a
r
elativ
ely
s
im
p
le
way
to
in
cr
ea
s
e
th
e
k
e
y
s
ize
[
1
9
]
.
3
.
1
.
2
.
Riv
est
cipher
(
RC2
)
T
h
e
R
C
2
is
d
ev
elo
p
ed
b
y
R
o
n
R
ev
is
t
1
9
8
7
to
r
ep
lace
DE
S
[
1
4
]
.
T
h
e
d
ata
b
l
o
ck
s
ize
o
f
R
C
2
is
6
4
b
its
,
wh
ile
th
e
k
ey
s
ize
r
an
g
es
f
r
o
m
4
0
to
1
0
2
4
b
its
(5
-
1
2
8
b
y
te)
.
T
h
e
k
ey
s
ize
g
r
ad
u
ally
in
cr
ea
s
es
b
y
8
b
its
f
r
o
m
th
e
p
r
e
v
io
u
s
s
ize.
On
th
e
o
th
er
h
an
d
,
m
ess
ag
es
en
cr
y
p
t
ed
in
R
C
2
ca
n
b
e
b
r
o
k
en
in
s
h
o
r
t
tim
e
b
y
u
s
in
g
a
b
r
u
te
f
o
r
ce
attac
k
,
s
o
it
is
co
n
s
id
er
ed
u
n
s
ec
u
r
e
d
.
I
n
R
C
2
T
h
e
k
ey
is
co
m
p
o
u
n
d
f
r
o
m
an
i
n
itializatio
n
v
ec
to
r
(
IV
)
an
d
KE
Y
[
1
4
]
.
3
.
1
.
3
.
Adv
a
nced
encr
y
ptio
n sta
nd
er
d
(
AE
S)
T
h
e
s
tan
d
ar
d
(
AE
S)
is
b
ased
o
n
a
s
y
m
m
etr
ic
b
l
o
ck
cip
h
er
d
ef
i
n
ed
b
y
th
e
Natio
n
al
I
n
s
titu
te
o
f
Stan
d
ar
d
s
an
d
T
ec
h
n
o
lo
g
y
(
N
I
ST)
in
2
0
0
1
[
8
]
.
I
t
s
u
p
p
o
r
ts
b
lo
ck
s
ize
1
2
8
b
its
o
f
d
ata,
a
n
d
it
h
an
d
les
th
r
ee
s
izes
o
f
k
ey
s
1
2
8
,
1
9
2
,
2
5
6
b
i
ts
[
2
0
]
.
T
h
e
m
ax
im
u
m
n
u
m
b
er
o
f
r
o
u
n
d
s
p
r
o
ce
s
s
ed
b
y
AE
S
is
1
4
,
an
d
th
e
n
u
m
b
er
o
f
r
o
u
n
d
s
d
e
p
en
d
s
o
n
th
e
s
ize
o
f
th
e
k
ey
u
s
ed
,
wh
e
r
e
th
e
k
e
y
s
ize
1
2
8
co
r
r
esp
o
n
d
s
to
1
0
r
o
u
n
d
s
th
at
ar
e
p
r
o
ce
s
s
ed
,
wh
ile
1
9
2
b
its
co
r
r
esp
o
n
d
to
1
2
r
o
u
n
d
s
,
f
in
all
y
2
5
6
co
r
r
esp
o
n
d
s
to
1
4
r
o
u
n
d
s
[
7
]
.
3
.
1
.
4
.
T
wo
f
is
h
T
h
e
alg
o
r
ith
m
o
f
th
e
two
f
is
h
is
p
u
r
ch
ased
in
1
9
9
8
b
y
B
r
u
ce
Sch
n
eier
.
I
t
d
ep
en
d
s
o
n
t
h
e
ty
p
e
o
f
b
lo
ck
cip
h
e
r
an
d
u
s
es
k
ey
s
with
s
izes
1
2
8
,
1
9
2
,
an
d
2
5
6
as
a
m
ax
im
u
m
,
a
n
d
th
e
d
ata
b
lo
c
k
is
1
2
8
b
its
,
an
d
it
is
co
n
s
id
er
ed
o
n
e
o
f
t
h
e
f
iv
e
f
in
al
co
n
ten
d
e
r
s
with
R
ijn
d
ae
l,
b
u
t
d
o
es
n
o
t
r
ea
ch
th
e
f
ir
s
t
lev
el
an
d
is
co
n
s
id
er
ed
alm
o
s
t c
o
m
p
lex
,
e
x
ce
p
t I
t w
o
r
k
s
with
d
if
f
er
e
n
t e
n
cr
y
p
tio
n
m
o
d
es
[
2
1
]
.
3
.
1
.
5
.
Serpent
T
h
e
s
er
p
en
t
alg
o
r
ith
m
is
a
b
lo
ck
cip
h
er
.
I
t
h
as
h
ig
h
s
e
cu
r
ity
,
as
it
co
m
p
etes
with
R
ijn
d
ae
l's
alg
o
r
ith
m
.
T
h
is
is
b
ec
au
s
e
Ser
p
en
t'
s
alg
o
r
ith
m
was
co
m
p
eti
n
g
with
AE
S,
b
u
t
its
s
lo
w
s
p
e
ed
ca
u
s
ed
it
n
o
t
to
b
e
ad
o
p
ted
,
s
o
R
ijn
d
ae
l
was
ch
o
s
en
as
AE
S.
Alth
o
u
g
h
th
er
e
ar
e
m
an
y
ap
p
licatio
n
s
o
f
th
e
s
er
p
en
t
alg
o
r
ith
m
;
As
an
ex
am
p
le,
im
ag
es a
r
e
en
cr
y
p
ted
with
it
[
2
2
]
.
3
.
2
.
H
a
s
h
f
un
ct
io
ns
I
t
is
also
k
n
o
wn
as
o
n
e
-
way
en
cr
y
p
tio
n
o
r
m
ess
ag
e
d
ig
est
s
,
h
ash
in
g
is
u
s
ed
to
p
r
o
d
u
ce
a
u
n
iq
u
e,
f
ix
ed
-
s
ize
v
alu
e
to
r
ep
r
esen
t
a
v
ar
iab
le
am
o
u
n
t
o
f
d
ata,
an
d
n
o
n
ee
d
f
o
r
a
k
ey
,
as
th
e
r
ef
er
en
ce
r
ep
r
esen
ts
th
e
k
ey
its
elf
.
T
h
ey
a
r
e
wid
ely
u
s
ed
in
s
to
r
in
g
p
ass
wo
r
d
s
,
d
i
g
ital
s
ig
n
atu
r
es,
as
th
ey
wo
r
k
to
m
atch
th
e
h
ash
v
alu
es o
f
two
s
ets o
f
r
e
f
er
en
ce
s
an
d
if
th
ey
m
atch
,
th
e
r
esu
lt
is
tr
u
e
[
2
3
]
.
On
e
o
f
t
h
e
co
m
m
o
n
h
ash
in
g
m
eth
o
d
s
in
c
r
y
p
t
o
g
r
ap
h
y
is
k
n
o
wn
as
SHA
-
1
,
w
h
ich
p
r
o
d
u
ce
s
h
ash
v
alu
es
o
f
1
6
0
b
its
[
2
4
]
eq
u
i
v
ale
n
t
to
4
0
d
i
g
its
lo
n
g
as
h
ex
ad
ec
im
al
(
2
0
b
y
tes)
[
2
5
]
,
th
at
p
u
b
lis
h
ed
in
FIPS
180
-
1
[
2
6
]
.
An
o
th
e
r
ty
p
e
o
f
h
ash
alg
o
r
ith
m
wh
ich
w
ill
b
e
u
s
ed
in
th
is
wo
r
k
to
d
er
iv
e
k
ey
s
is
H
MA
C
-
S
HA
-
512
an
d
u
s
ed
as
an
HM
AC
o
r
h
ash
-
b
ased
m
ess
ag
e
au
th
e
n
ticatio
n
co
d
e
[
2
7
]
.
T
h
e
HM
AC
p
r
o
ce
s
s
m
ix
es
m
ess
ag
e
d
ata
with
th
e
s
ec
r
et
k
ey
,
h
ash
es
th
e
o
u
t
p
u
t
with
th
e
h
ash
f
u
n
ctio
n
,
an
d
r
ep
ea
t
m
i
x
es
th
e
o
u
t
p
u
t
h
as
h
v
alu
e
with
th
e
s
ec
r
et
k
e
y
,
a
n
d
th
en
im
p
lem
en
ts
th
e
h
ash
f
u
n
ctio
n
a
g
ain
[
2
8
]
.
T
h
e
o
u
tp
u
t
len
g
th
o
f
t
h
e
h
ash
v
alu
e
is
512
b
it
s
.
HM
AC
-
S
H
A
-
512
is
a
b
etter
ch
o
ice
to
ac
h
iev
e
s
ec
u
r
ity
an
d
to
en
s
u
r
e
d
ata
co
n
f
id
en
tiality
an
d
p
er
f
ec
tio
n
o
f
th
e
s
ec
u
r
ity
alg
o
r
ith
m
[
2
9
]
.
3
.
3
.
Ra
nd
o
m
nu
m
bers g
ener
a
t
o
r
(
RNG
)
R
an
d
o
m
n
u
m
b
er
g
en
e
r
ato
r
(
R
NG)
alo
n
g
with
en
cr
y
p
tio
n
alg
o
r
ith
m
is
th
e
b
asis
o
f
cr
y
p
to
g
r
a
p
h
y
s
y
s
tem
s
[
3
0
]
.
So
it
is
co
n
s
id
e
r
ed
th
at
n
o
m
atter
h
o
w
co
m
p
l
ex
en
cr
y
p
ti
o
n
alg
o
r
ith
m
s
ar
e
im
p
lem
en
ted
,
th
ey
b
ec
o
m
e
wea
k
with
o
u
t
th
e
r
an
d
o
m
n
u
m
b
er
g
en
er
ato
r
p
r
esen
t
in
th
e
r
o
o
t
o
f
th
is
s
y
s
tem
a
n
d
also
to
s
ay
th
at
th
e
R
NG
i
s
th
e
b
as
is
o
f
cy
b
er
s
ec
u
r
ity
as
a
wh
o
le.
T
h
er
f
o
r
e
,
it
is
ex
t
r
em
ely
im
p
o
r
tan
t
to
en
s
u
r
e
th
e
q
u
ality
o
f
a
m
ec
h
an
is
m
f
o
r
g
en
er
atin
g
co
m
p
letely
r
an
d
o
m
n
u
m
b
er
s
.
T
h
is
r
esear
ch
will
u
s
e
th
e
R
NG
i
m
p
lem
en
ted
b
y
th
e
cr
y
p
to
g
r
ap
h
ic
s
er
v
ice
p
r
o
v
id
e
r
(
C
SP
)
lib
r
ar
y
wh
ich
g
en
er
at
es
r
an
d
o
m
n
u
m
b
er
s
with
h
ig
h
q
u
ality
an
d
n
o
way
to
p
r
ed
ict
o
r
r
ep
r
o
d
u
ce
k
e
y
s
eq
u
en
ce
[
3
1
]
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
5
0
2
-
4
7
5
2
I
n
d
o
n
esian
J
E
lec
E
n
g
&
C
o
m
p
Sci,
Vo
l.
23
,
No
.
2
,
Au
g
u
s
t 2
0
2
1
:
1
0
1
8
-
1
0
2
9
1022
3
.
4
.
P
B
K
DF
2
Pas
s
wo
r
d
-
b
ased
k
ey
d
er
iv
ati
o
n
f
u
n
ctio
n
ality
(
PB
KDF2
)
v
er
s
io
n
2
th
at
I
m
p
le
m
en
te
d
th
r
o
u
g
h
R
f
c2
8
9
8
Der
iv
e
B
y
tes
[
3
1
]
,
b
y
u
s
in
g
a
r
an
d
o
m
n
u
m
b
er
g
en
er
ato
r
b
ased
o
n
HM
AC
-
S
HA
-
512
.
T
o
p
r
o
v
i
d
e
ef
f
ec
tiv
e
p
r
o
tectio
n
ag
ain
s
t
b
r
u
te
-
f
o
r
ce
attac
k
s
,
PB
KD
F2
p
r
o
f
f
e
r
s
C
PU
-
in
ten
s
iv
e
o
p
er
atio
n
s
.
T
h
e
b
asis
o
f
th
ese
o
p
er
atio
n
s
ar
e
b
ased
o
n
th
e
iter
ated
o
f
a
p
s
eu
d
o
-
r
an
d
o
m
n
u
m
b
e
r
s
g
en
er
ato
r
f
u
n
ctio
n
th
at
ass
ig
n
s
in
p
u
t
v
alu
es to
a
d
er
i
v
ed
k
e
y
[
3
2
]
.
F
ig
u
r
e
3
,
s
h
o
ws
th
e
th
r
ee
m
ain
in
p
u
ts
o
f
PB
KDF2
alg
o
r
ith
m
.
Fig
u
r
e
3
.
Pas
s
wo
r
d
-
b
ased
k
ey
d
er
iv
atio
n
f
u
n
ctio
n
ality
4.
M
E
T
H
O
D
AND
M
AT
E
R
I
A
L
Fro
m
th
e
a
f
o
r
em
e
n
tio
n
ed
tec
h
n
ical
an
d
s
ec
u
r
ity
h
ig
h
lig
h
t
s
,
two
r
esear
ch
q
u
esti
o
n
s
ar
e
p
o
s
ed
t
o
s
o
lv
e:
“Ho
w
d
o
es
t
h
e
m
a
n
ag
em
en
t
o
f
Fallu
jah
d
am
i
m
p
r
o
v
e
tech
n
ically
to
war
d
an
ef
f
ec
tiv
e
d
am
m
an
ag
em
en
t
s
y
s
tem
?”
,
An
d
“Ho
w
ca
n
th
e
d
ata
s
ec
u
r
ity
o
f
th
is
d
am
m
an
a
g
em
en
t
s
y
s
tem
b
e
s
u
f
f
icien
tly
en
r
ich
ed
?
T
h
is
s
ec
tio
n
will a
n
s
wer
th
ese
two
q
u
esti
o
n
s
b
y
p
r
esen
tin
g
th
e
d
esig
n
an
d
im
p
le
m
en
tatio
n
o
f
a
d
am
m
an
ag
em
en
t
s
y
s
tem
an
d
r
ec
o
m
m
en
d
in
g
a
m
u
lti
-
tier
s
ec
u
r
e
m
o
d
el
to
m
ain
tain
d
ata
in
teg
r
ity
b
y
en
cr
y
p
tin
g
d
ata
v
ia
AE
S
alg
o
r
ith
m
with
r
an
d
o
m
g
en
er
ati
ng
o
f
th
e
d
y
n
am
ic
s
alt
v
alu
e,
an
d
th
is
alg
o
r
ith
m
is
ch
o
s
en
f
o
r
th
eir
g
o
o
d
p
er
f
o
r
m
a
n
ce
af
ter
an
an
aly
s
is
o
f
p
r
ac
tical
co
m
p
ar
is
o
n
o
f
s
ev
er
al
al
g
o
r
ith
m
s
u
s
in
g
C
r
y
p
to
o
l
1
.
4
.
4
an
d
C
h
ilk
at
lib
r
ar
ies,
b
ef
o
r
e
a
n
d
af
ter
m
er
g
in
g
d
y
n
am
ic
s
al
t p
r
o
ce
s
s
.
4
.
1
.
Desig
n o
f
da
m
m
a
na
g
e
m
ent
s
y
s
t
em
T
h
e
s
ch
em
a
wh
ic
h
is
s
u
g
g
est
ed
f
o
r
DM
S
in
th
is
p
a
p
er
,
i
n
clu
d
e
s
th
e
f
o
llo
win
g
c
o
m
p
o
n
en
ts
:
u
s
er
in
f
o
r
m
atio
n
,
d
a
m
d
ata,
r
ea
l
-
tim
e
d
am
h
y
d
r
o
lo
g
ical
d
ata,
teleg
r
ap
h
s
,
wate
r
h
is
to
r
y
d
ata,
an
d
e
m
p
lo
y
ee
m
o
v
em
en
t
h
is
to
r
y
,
s
ee
Fig
u
r
e
4
.
Fig
u
r
e
4
.
C
o
n
ce
p
tu
al
d
esig
n
o
f
d
am
r
elatio
n
al
s
ch
em
a
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
d
o
n
esian
J
E
lec
E
n
g
&
C
o
m
p
Sci
I
SS
N:
2502
-
4
752
Da
ta
s
ec
u
r
ity
u
s
in
g
r
a
n
d
o
m
d
yn
a
mic
s
a
ltin
g
a
n
d
A
E
S
b
a
s
ed
o
n
ma
s
ter
-
s
la
ve
ke
ys fo
r
…
(
Hu
s
s
a
m
J.
A
li
)
1023
4
.
2
.
M
ulti
-
T
ier
s
ec
ure
m
o
del
T
o
m
ee
t
all
s
ec
u
r
ity
is
s
u
es
o
f
d
ata
in
teg
r
ity
an
d
u
s
er
s
p
r
iv
a
cy
p
r
o
tectio
n
,
it
is
h
ig
h
ly
r
ec
o
m
m
en
d
ed
to
co
n
s
id
er
th
e
f
o
llo
win
g
m
u
lti
-
tier
s
ec
u
r
e
m
o
d
el
p
r
o
p
o
s
ed
as
s
h
o
wn
in
Fig
u
r
e
5
,
with
th
e
co
m
p
o
n
en
ts
o
f
m
o
d
el.
Fig
u
r
e
5
.
T
h
e
m
u
lti
-
tier
s
ec
u
r
e
m
o
d
el
f
o
r
d
a
m
m
an
a
g
em
en
t s
y
s
tem
4
.
3
.
E
ncry
ptio
n
/
decr
y
ptio
n pro
po
s
ed
s
chem
e
T
h
is
s
ec
tio
n
ex
p
lai
n
s
th
e
m
a
in
s
tag
es
o
f
th
e
p
r
o
p
o
s
ed
m
o
d
el
f
o
r
t
h
e
en
c
r
y
p
tio
n
a
n
d
d
ec
r
y
p
tio
n
p
r
o
ce
s
s
o
f
th
e
tex
t,
in
th
e
f
ir
s
t
s
tag
e
th
e
p
ar
am
eter
s
an
d
b
asic
v
alu
es
o
f
th
e
s
alt
s
ize
ar
e
in
itialized
,
th
e
in
itial
p
r
im
ar
y
k
e
y
s
tr
in
g
is
in
itializ
ed
f
r
o
m
th
e
p
ass
wo
r
d
g
en
er
at
ed
th
r
o
u
g
h
R
NG,
th
e
n
ex
t
s
ta
g
e
is
th
e
p
r
o
ce
s
s
o
f
g
en
er
atin
g
th
e
s
alt
v
alu
e
also
th
r
o
u
g
h
R
NG,
af
ter
th
at
t
h
e
s
tag
e
o
f
d
er
iv
in
g
th
e
en
cr
y
p
tio
n
k
ey
t
h
r
o
u
g
h
PB
KD
F2
,
th
en
co
m
es
th
e
s
tag
e
o
f
en
cr
y
p
tio
n
th
e
te
x
t
th
r
o
u
g
h
AE
S
,
an
d
f
i
n
ally
th
e
s
tag
e
o
f
g
en
er
atin
g
th
e
s
ec
o
n
d
ar
y
k
ey
a
n
d
p
r
o
tectin
g
th
e
s
alt
v
alu
e
th
r
o
u
g
h
XOR
Pro
cc
ess
.
Fig
u
r
e
6
illu
s
tr
ate
s
th
e
s
tag
es
o
f
th
e
en
cr
y
p
tio
n
an
d
d
ec
r
y
p
tio
n
p
r
o
ce
s
s
in
d
etail
.
T
h
e
n
ex
t su
b
s
ec
tio
n
s
d
escr
ib
e
th
ese
s
tag
es.
4
.
3
.
1
.
I
nitia
liza
t
io
n
ba
s
ic
pa
ra
m
et
er
s
a
nd
v
a
lues
s
t
a
g
e
I
n
th
e
p
r
o
p
o
s
ed
m
o
d
el,
p
d
en
o
tes
f
o
r
p
lain
tex
t,
C
is
th
e
cip
h
er
tex
t,
S
is
th
e
s
alt
v
alu
e,
wh
ile
SK
is
th
e
s
ec
o
n
d
ar
y
k
ey
.
T
h
is
s
tag
e
is
im
p
lem
en
ted
th
r
o
u
g
h
th
e
f
o
llo
win
g
s
tep
s
:
-
Step
1
: A
s
s
ig
n
th
e
p
ass
wo
r
d
s
tr
in
g
.
-
Step
2
: I
n
itialize
S
len
g
th
to
a
f
ix
ed
s
ize
(
3
2
b
y
tes).
-
Step
3
: Co
n
v
er
t p
lain
te
x
t to
A
s
cii
an
d
th
en
to
d
ec
im
al
an
d
s
et
len
g
th
p
b
y
te
f
r
o
m
th
e
p
lain
t
ex
t le
n
g
th
.
-
Step
4
: I
n
itialize
v
alu
es o
f
p
b
y
te
[
0
-
(i
-
1
)
]
f
r
o
m
th
e
d
ec
im
al
v
alu
s
p
r
o
d
u
ce
d
i
n
s
tep
3
.
4
.
3
.
2
.
G
ener
a
t
ing
t
he
s
al
t
v
a
lue
s
t
hro
ug
h RN
G
cr
y
pto
s
er
v
ice
pro
v
ider
s
t
a
g
e
T
h
e
r
an
d
o
m
s
alt
ch
ain
ac
h
iev
e
d
th
r
o
u
g
h
t
h
e
f
o
llo
win
g
s
tep
s
:
-
Step
1
: Set
len
g
th
o
f
s
alt
[
I
]
=3
2
f
r
o
m
S len
g
th
t
h
at
in
itialized
f
r
o
m
t
h
e
f
ir
s
t stag
e.
-
Step
2
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C
r
y
p
to
alg
o
r
ith
m
im
p
lem
en
ts
u
n
d
er
s
a
lt[
I
]
len
g
th
d
e
f
in
ed
.
4
.
3
.
3
.
D
er
iv
ing
t
he
e
ncry
pti
o
n
k
ey
t
hro
ug
h P
B
K
DF
2
T
h
e
PB
KDF2
alg
o
r
ith
m
's
r
o
b
u
s
tn
ess
an
d
ef
f
icien
cy
in
d
er
i
v
in
g
an
u
n
p
r
e
d
ictab
le
cip
h
er
k
ey
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ep
e
n
d
o
n
th
e
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r
ag
m
en
tatio
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f
th
e
elem
en
tar
y
elem
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d
th
e
ex
ec
u
tio
n
o
f
th
e
HM
AC
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SHA
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512
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ash
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o
r
ith
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n
u
m
b
er
o
f
r
o
u
n
d
s
r
a
n
g
i
n
g
f
r
o
m
1
to
m
o
r
e
th
an
1
0
,
0
0
0
r
o
u
n
d
s
.
I
n
t
h
is
p
ap
er
,
o
n
ly
8
r
o
u
n
d
s
ar
e
ap
p
li
ed
d
u
e
to
less
tim
e
co
n
s
u
m
p
tio
n
an
d
a
t
th
e
s
am
e
tim
e,
to
o
b
tain
a
co
m
p
letely
s
ec
u
r
e
h
ash
k
ey
.
T
h
e
f
o
llo
win
g
s
tep
s
ex
p
lain
th
e
im
p
lem
en
tati
o
n
o
f
th
is
s
tag
e
f
o
r
th
e
f
ir
s
t r
o
u
n
d
:
-
Step
1
: T
ak
in
g
a
r
an
d
o
m
s
alt,
an
d
f
lip
b
its
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g
iv
in
g
K
1
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-
Step
2
:
C
alcu
latin
g
th
e
SHA
-
5
1
2
h
ash
o
f
K1
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lu
s
p
ass
wo
r
d
s
tr
in
g
,
g
iv
i
n
g
H1
.
-
Step
3
: I
ter
atio
n
s
co
u
n
t =
co
u
n
t++
.
All step
s
ab
o
v
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til
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e
co
n
d
itio
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als tr
u
e
,
th
en
co
m
p
u
t
in
g
th
e
f
in
al
h
ash
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
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N
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I
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d
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J
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p
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No
.
2
,
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g
u
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t 2
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r
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f
i
g
u
r
atio
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in
itialize
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ec
to
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an
d
cip
h
er
m
o
d
e,
a
f
ter
t
h
at
th
e
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cr
y
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tio
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p
r
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ce
s
s
b
eg
in
s
as th
e
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llo
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g
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s
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Step
1
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n
itialize
k
ey
B
y
te
(
)
r
a
n
g
ed
(
0
-
3
1
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f
r
o
m
th
e
h
ash
k
e
y
th
at
p
r
o
d
u
ce
s
in
s
tag
e
3
.
-
Step
2
: Set
I
V
len
g
th
=
1
2
8
/
8
=>
1
6
b
y
te
-
Step
3
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n
i
tialize
th
e
v
alu
e
o
f
I
VB
y
te
(
0
-
1
5
)
f
r
o
m
th
e
h
ash
k
ey
.
-
Step
4
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ate
E
n
cr
y
p
t
o
r
(
b
y
te
(
ar
r
ay
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k
ey
B
y
te,
b
y
te(
ar
r
a
y
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I
VB
y
te)
.
-
Step
5
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cip
h
er
m
o
d
e
=
C
B
C
.
-
Step
6
:
Seg
m
en
tatio
n
p
b
yte(
a
r
r
a
y)
to
B
lo
ck
Size(
0
-
1
5
)
ar
r
a
y
an
d
m
a
k
e
tr
an
s
f
o
r
m
atio
n
p
r
o
ce
s
s
to
cip
h
er
tex
t
C
(
ar
r
ay
)
r
a
n
g
ed
[
k
0
-
(k
-
1
)
]
.
(
a)
(
b
)
Fig
u
r
e
6
.
P
r
o
p
o
s
ed
m
et
h
o
d
of
;
(
a)
e
n
cr
y
p
tio
n
p
r
o
ce
s
s
an
d
(
b
)
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ec
r
y
p
tio
n
p
r
o
ce
s
s
4
.
3
.
5
.
I
nitia
lizing
t
he
ind
epe
nd
ent
s
la
v
e
k
ey
T
h
e
b
en
ef
it
o
f
th
e
in
d
e
p
en
d
en
t
k
ey
is
to
p
r
o
tect
th
e
v
alu
e
o
f
th
e
s
alt,
an
d
wh
en
r
etr
iev
in
g
th
e
en
cr
y
p
ted
d
ata
f
r
o
m
t
h
e
d
ata
b
ase,
th
e
v
alu
e
o
f
t
h
e
s
alt
is
r
etr
iev
ed
with
th
is
k
ey
,
wh
i
ch
was
p
r
ev
io
u
s
ly
g
en
er
ated
b
y
R
NG
in
d
ep
e
n
d
e
n
tly
with
a
s
ize
o
f
3
2
b
y
tes,
an
d
th
e
f
o
llo
win
g
s
tep
s
ex
p
lain
t
h
is
s
tag
e:
-
Step
1
:
I
n
itializin
g
r
an
d
o
m
s
al
t
(
ar
r
ay
)
v
alu
e
th
at
g
en
er
ated
v
ia
R
NG
alg
o
r
ith
m
in
s
tag
e
2
.
-
Step
2
: I
n
itializin
g
SK
(
ar
r
a
y
)
v
alu
es r
an
g
e
d
(
0
-
31
)
.
-
Step
3
:
C
o
m
p
u
te
f
in
al
s
alt
(
ar
r
ay
)
b
y
XORed
with
SK
(
ar
r
ay
)
,
an
d
a
p
p
en
d
ed
with
cip
h
er
tex
t
ar
r
ay
,
as
s
h
o
wn
in
Fig
u
r
e
7
.
-
S
tep
4:
T
h
e
f
in
al
ci
p
h
er
tex
t e
n
cr
y
p
ted
th
r
o
u
g
h
th
e
B
ase6
4
alg
o
r
ith
m
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
d
o
n
esian
J
E
lec
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n
g
&
C
o
m
p
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u
r
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ec
u
r
ity
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o
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e
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o
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th
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le
n
g
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o
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th
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e
alg
o
r
ith
m
b
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o
m
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im
m
u
n
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o
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o
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4
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ey
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ac
e
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u
s
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e
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ter
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2
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3
5
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en
g
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o
f
th
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n
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e
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ap
e
r
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its
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e
k
ey
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ac
e
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b
e
2
256
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.
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x
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th
e
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o
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o
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f
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al
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ey
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ac
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u
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=
2
[
]
+
[
]
(
1
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=
2
256
+
256
=
2
512
(
2
)
Fro
m
th
e
ab
o
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e
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atio
n
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h
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ac
e
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f
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2
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iv
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Go
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er
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en
s
i
tiv
e
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y
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ec
r
et
k
ey
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an
g
es
[
3
3
]
.
T
a
b
le
2
,
d
is
p
lay
s
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lain
t
ex
t
with
a
s
ize
o
f
6
1
ch
ar
ac
ter
s
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ter
en
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y
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tio
n
it
with
two
v
er
y
litt
le
d
if
f
er
en
t
k
ey
s
,
th
e
cip
h
er
tex
t
will
ap
p
ea
r
co
m
p
letely
d
if
f
er
en
t
an
d
th
er
e
ar
e
n
o
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ata
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o
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d
with
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e
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lain
te
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t,
s
o
th
e
p
r
o
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o
s
ed
en
cr
y
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tio
n
m
o
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el
h
as a
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ig
h
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en
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itiv
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y
c
h
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g
es in
th
e
s
ec
r
et
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ey
s
.
T
ab
le
2
.
Key
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en
s
itiv
ity
ex
am
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P
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a
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e
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C
i
p
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G
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4
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p
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Fig
u
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1
1
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co
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1
5
item
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.
T
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r
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lts
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L
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le
with
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ca
lcu
latio
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o
f
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m
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ea
n
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