I
nte
rna
t
io
na
l J
o
urna
l o
f
I
nfo
r
m
a
t
ics a
nd
Co
mm
u
n
ica
t
io
n T
ec
hn
o
lo
g
y
(
I
J
-
I
CT
)
Vo
l.
8
,
No
.
2
,
A
u
g
u
s
t
201
9
,
p
p
.
77
~
86
I
SS
N:
2252
-
8776
,
DOI
: 1
0
.
1
1
5
9
1
/i
j
ict.
v
8
i2
.
p
p
7
7
-
86
77
J
o
ur
na
l ho
m
ep
a
g
e
:
h
ttp
:
//ia
e
s
co
r
e.
co
m/jo
u
r
n
a
ls
/in
d
ex
.
p
h
p
/
I
JI
C
T
A secure
dedu
plic
a
tion sche
m
e
for
encryp
ted
data
Vis
ha
l P
a
s
s
ric
ha
1
,
Ash
i
s
h C
ho
pra
2
,
P
o
o
j
a
Sh
a
r
m
a
3
,
Sh
u
bh
a
ns
hi Sin
g
ha
l
4
1,
2
A
ss
istan
t
P
r
o
f
e
ss
o
r,
Na
ti
o
n
a
l
In
sti
tu
te o
f
T
e
c
h
n
o
lo
g
y
,
In
d
ia
3
L
e
c
tu
re
r,
G
o
v
e
rn
m
e
n
t
Co
ll
e
g
e
fo
r
W
o
m
e
n
,
In
d
ia
4
A
s
sista
n
t
P
ro
f
e
ss
o
r,
T
ERi
i.
,
Ku
r
u
k
sh
e
tr
a
Un
iv
e
rsity
,
In
d
ia
Art
icle
I
nfo
AB
ST
RAC
T
A
r
ticle
his
to
r
y:
R
ec
eiv
ed
No
v
2
2
,
2
0
1
8
R
ev
i
s
ed
Ma
r
2
5
,
2
0
1
9
A
cc
ep
ted
A
p
r
20
,
2
0
1
9
Clo
u
d
sto
ra
g
e
(CS
)
is
g
a
in
in
g
m
u
c
h
p
o
p
u
larity
n
o
w
a
d
a
y
s
b
e
c
a
u
s
e
it
o
f
f
e
rs
lo
w
-
c
o
st
a
n
d
c
o
n
v
e
n
ien
t
n
e
tw
o
rk
sto
ra
g
e
s
e
rv
ic
e
s.
In
th
is
b
ig
d
a
ta
e
ra
,
th
e
e
x
p
lo
siv
e
g
ro
w
th
in
d
ig
it
a
l
d
a
ta
m
o
v
e
s
th
e
u
se
rs
to
w
a
rd
s
CS
to
sto
re
th
e
ir
m
a
ss
iv
e
d
a
ta.
T
h
is
e
x
p
lo
siv
e
g
ro
w
th
o
f
d
a
ta
c
a
u
se
s
a
l
o
t
o
f
sto
ra
g
e
p
re
ss
u
re
o
n
CS
s
y
ste
m
s
b
e
c
a
u
se
a
lar
g
e
v
o
lu
m
e
o
f
th
is
d
a
ta
is
re
d
u
n
d
a
n
t.
Da
ta
d
e
d
u
p
li
c
a
ti
o
n
is
a
m
o
st
-
e
ff
e
c
ti
v
e
d
a
ta
re
d
u
c
ti
o
n
tec
h
n
i
q
u
e
t
h
a
t
id
e
n
ti
f
ies
a
n
d
e
li
m
in
a
tes
th
e
re
d
u
n
d
a
n
t
d
a
ta.
D
y
n
a
m
i
c
n
a
tu
re
o
f
d
a
ta
m
a
k
e
s
se
c
u
rit
y
a
n
d
o
w
n
e
rsh
ip
o
f
d
a
ta
a
s
a
v
e
r
y
im
p
o
rtan
t
issu
e
.
P
r
o
o
f
-
of
-
o
w
n
e
rsh
ip
sc
h
e
m
e
s
a
re
a
ro
b
u
st
w
a
y
to
c
h
e
c
k
th
e
o
w
n
e
rsh
ip
c
laim
e
d
b
y
a
n
y
o
w
n
e
r.
Ho
w
e
v
e
r
to
p
ro
tec
t
th
e
p
riv
a
c
y
o
f
d
a
ta,
m
a
n
y
u
se
rs
e
n
c
r
y
p
t
it
b
e
f
o
re
sto
rin
g
in
CS
.
T
h
is
m
e
th
o
d
a
f
f
e
c
ts
th
e
d
e
d
u
p
li
c
a
ti
o
n
p
ro
c
e
ss
b
e
c
a
u
se
e
n
c
ry
p
ti
o
n
m
e
t
h
o
d
s
h
a
v
e
v
a
r
y
in
g
c
h
a
ra
c
teristics
.
Co
n
v
e
rg
e
n
t
e
n
c
ry
p
ti
o
n
(CE)
sc
h
e
m
e
is
w
id
e
ly
u
se
d
f
o
r
se
c
u
re
d
a
ta
d
e
d
u
p
l
ica
ti
o
n
,
b
u
t
it
d
e
stro
y
s
th
e
m
e
ss
a
g
e
e
q
u
a
li
ty
.
A
lt
h
o
u
g
h
,
Du
p
L
ES
S
p
r
o
v
id
e
s
stro
n
g
p
riv
a
c
y
b
y
e
n
h
a
n
c
in
g
CE,
b
u
t
it
is
a
lso
f
o
u
n
d
in
su
f
f
icie
n
t.
T
h
e
p
ro
b
lem
w
it
h
t
h
e
CE
-
b
a
se
d
sc
h
e
m
e
is
th
a
t
th
e
u
se
r
c
a
n
d
e
c
r
y
p
t
th
e
c
l
o
u
d
d
a
ta
w
h
il
e
h
e
h
a
s
lo
st
h
is
o
w
n
e
rsh
ip
.
T
h
is
p
a
p
e
r
a
d
d
re
ss
e
s
th
e
p
ro
b
lem
o
f
o
w
n
e
rsh
ip
re
v
o
c
a
ti
o
n
b
y
p
ro
p
o
si
n
g
a
se
c
u
re
d
e
d
u
p
li
c
a
ti
o
n
sc
h
e
m
e
f
o
r
e
n
c
ry
p
t
e
d
d
a
ta.
T
h
e
p
r
o
p
o
se
d
sc
h
e
m
e
e
n
h
a
n
c
e
s
th
e
se
c
u
rit
y
a
g
a
in
st
u
n
a
u
t
h
o
r
ize
d
e
n
c
ry
p
ti
o
n
a
n
d
p
o
is
o
n
a
tt
a
c
k
o
n
th
e
p
re
d
icte
d
se
t
o
f
d
a
ta.
K
ey
w
o
r
d
s
:
C
lo
u
d
Sto
r
ag
e
C
o
n
v
er
g
e
n
t E
n
cr
y
p
t
io
n
Ded
u
p
licatio
n
P
r
o
o
f
-
of
-
O
w
n
er
s
h
ip
Co
p
y
rig
h
t
©
2
0
1
9
In
stit
u
te o
f
A
d
v
a
n
c
e
d
E
n
g
i
n
e
e
rin
g
a
n
d
S
c
ien
c
e
.
Al
l
rig
h
ts re
se
rv
e
d
.
C
o
r
r
e
s
p
o
nd
ing
A
uth
o
r
:
Sh
u
b
h
a
n
s
h
i Si
n
g
h
al,
Dep
ar
t
m
en
t o
f
C
o
m
p
u
ter
Scie
n
ce
an
d
E
n
g
i
n
ee
r
in
g
,
T
ec
h
n
o
lo
g
y
E
d
u
ca
tio
n
an
d
R
e
s
ea
r
ch
I
n
te
g
r
ated
I
n
s
ti
tu
te,
Ku
r
u
k
s
h
etr
a,
Har
y
a
n
a,
I
n
d
ia.
E
m
ail: S
h
u
b
h
a
n
s
h
i1
7
@
g
m
ail.
co
m
1.
I
NT
RO
D
UCT
I
O
N
I
n
t
h
is
d
i
g
ital
er
a,
th
e
d
ata
is
g
r
o
w
i
n
g
at
a
n
e
n
o
r
m
o
u
s
r
ate
h
en
ce
th
e
w
o
r
d
‘
B
ig
Data
’
i
s
in
tr
o
d
u
ce
d
.
So
cial
n
et
w
o
r
k
s
a
n
d
m
o
b
ile
co
m
p
u
ti
n
g
s
y
s
te
m
s
ar
e
m
aj
o
r
p
la
y
er
s
in
g
en
er
ati
n
g
B
ig
Data
.
T
h
e
1
6
.
1
Z
B
o
f
d
ata
w
a
s
p
r
o
d
u
ce
d
in
2
0
1
6
,
an
d
it
i
s
esti
m
a
ted
th
at
n
ea
r
l
y
1
6
3
.
2
Z
B
o
f
d
ata
w
il
l
b
e
p
r
o
d
u
ce
d
i
n
2
0
2
5
[
1
]
.
T
o
s
to
r
e
th
is
h
u
g
e
v
o
l
u
m
e
o
f
d
ata,
clo
u
d
s
er
v
ices
p
r
o
v
id
e
th
e
clo
u
d
s
to
r
ag
e
(
C
S)
th
at
ar
e
s
et
-
u
p
at
d
if
f
er
en
t
g
eo
g
r
ap
h
ical
lo
ca
tio
n
s
.
C
S
is
h
i
g
h
l
y
p
r
e
v
ale
n
t n
o
w
ad
a
y
s
b
ec
a
u
s
e
it
o
f
f
er
s
lo
w
-
co
s
t
a
n
d
lo
ca
t
io
n
i
n
d
ep
en
d
en
t
v
ir
t
u
al
s
to
r
ag
e
an
d
p
r
o
ce
s
s
in
g
r
eso
u
r
ce
s
[
2
]
.
T
h
e
v
o
lu
m
e
o
f
d
ata
i
s
r
is
i
n
g
ex
p
o
n
en
tiall
y
.
He
n
ce
,
clo
u
d
s
er
v
ice
p
r
o
v
id
er
s
(
C
SP
)
ar
e
r
eq
u
ir
ed
to
ad
o
p
t
s
o
m
e
tec
h
n
iq
u
es
f
o
r
m
an
a
g
i
n
g
d
is
k
s
p
ac
e
an
d
en
h
a
n
ci
n
g
r
eliab
ilit
y
.
Data
d
ed
u
p
licatio
n
is
a
tech
n
iq
u
e
t
h
at
id
en
t
if
ie
s
an
d
eli
m
i
n
ate
s
th
e
r
ed
u
n
d
an
t
d
ata
an
d
s
to
r
es
an
o
n
l
y
s
in
g
le
in
s
ta
n
ce
o
f
it.
I
t
i
m
p
r
o
v
es
b
o
t
h
s
a
v
i
n
g
s
o
f
s
to
r
ag
e
s
p
ac
e
a
n
d
n
et
w
o
r
k
b
an
d
w
id
t
h
[
3
-
5
]
.
Dr
o
p
b
o
x
[
6
]
,
Go
o
g
le
Dr
iv
e
[
7
]
,
an
d
I
Dr
iv
e
[
8
]
h
av
e
also
ad
o
p
ted
d
ed
u
p
licatio
n
tec
h
n
iq
u
es to
r
ed
u
ce
r
eso
u
r
ce
co
n
s
u
m
p
tio
n
.
C
S
s
ec
u
r
it
y
i
s
also
a
c
h
alle
n
g
in
g
is
s
u
e.
C
S
ad
o
p
ts
v
ar
io
u
s
d
ata
in
te
g
r
it
y
ch
ec
k
i
n
g
s
c
h
e
m
e
s
f
o
r
s
ec
u
r
it
y
,
b
u
t
clien
t
-
s
id
e
d
ed
u
p
licatio
n
al
w
a
y
s
ar
is
e
s
s
ec
u
r
it
y
i
s
s
u
es.
M
alicio
u
s
u
s
er
s
m
a
y
d
o
w
n
lo
ad
a
n
y
f
ile
b
y
c
h
ea
tin
g
th
e
clo
u
d
s
er
v
er
(
C
SS
)
.
P
r
o
o
f
-
of
-
o
w
n
er
s
h
ip
is
t
h
e
h
ig
h
l
y
ad
ap
tab
le
ap
p
r
o
ac
h
f
o
r
s
ec
u
r
e
clie
n
t
-
s
id
e
d
ed
u
p
licatio
n
.
B
y
th
i
s
,
th
e
o
wn
er
ca
n
ef
f
ec
t
iv
el
y
p
r
o
v
e
to
clo
u
d
s
er
v
er
h
i
s
o
w
n
er
s
h
ip
th
at
h
e
in
d
ee
d
h
o
ld
s
t
h
e
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
2
5
2
-
8776
I
n
t J
I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
,
Vo
l.
8
,
No
.
2,
A
u
g
u
s
t
201
9
:
77
–
86
78
w
h
o
le
f
ile.
T
h
e
cu
s
to
m
er
u
s
u
all
y
e
n
cr
y
p
t
s
h
is
p
r
iv
ate
d
at
a
w
it
h
h
i
s
o
w
n
en
cr
y
p
tio
n
k
e
y
an
d
u
p
lo
ad
s
th
e
en
cr
y
p
ted
d
ata
to
C
S
to
p
r
eser
v
e
h
i
s
p
r
iv
ac
y
.
R
an
d
o
m
iza
tio
n
in
e
n
cr
y
p
tio
n
,
i.e
.
,
d
if
f
e
r
en
t
k
e
y
s
g
e
n
er
ate
d
if
f
er
e
n
t c
ip
h
er
te
x
t
f
o
r
th
e
s
a
m
e
d
ata
lead
s
to
in
f
ea
s
ib
ilit
y
i
n
d
ed
u
p
licatio
n
.
C
o
n
v
er
g
e
n
t
en
cr
y
p
t
io
n
(
C
E
)
is
a
g
o
o
d
s
o
lu
tio
n
to
th
is
p
r
o
b
le
m
.
I
n
C
E
,
th
e
en
cr
y
p
tio
n
k
e
y
is
d
er
iv
ed
f
r
o
m
th
e
d
ata
its
el
f
f
o
r
en
cr
y
p
t
io
n
[
9
]
.
T
h
er
ef
o
r
e,
ev
er
y
u
s
er
h
av
i
n
g
th
e
s
a
m
e
d
ata
w
ill
g
e
t
th
e
s
a
m
e
cip
h
er
te
x
t.
B
y
t
h
i
s
,
d
ed
u
p
licatio
n
o
f
e
n
cr
y
p
ted
d
ata
is
m
ad
e
p
o
s
s
ib
le.
T
h
e
m
aj
o
r
s
ec
u
r
it
y
f
la
w
i
n
C
E
is
th
at
k
e
y
d
er
iv
a
tio
n
p
r
o
ce
s
s
is
d
eter
m
in
i
s
tic,
i.e
.
,
s
a
m
e
f
ile
s
al
w
a
y
s
d
er
iv
e
t
h
e
s
a
m
e
e
n
cr
y
p
tio
n
k
e
y
.
I
f
attac
k
er
s
g
e
t
t
h
e
k
e
y
,
th
e
n
C
E
b
ec
o
m
es
w
o
r
t
h
les
s
[
9
]
.
T
h
e
p
r
o
b
lem
o
f
C
E
is
s
o
l
v
ed
b
y
D
u
p
L
E
S
S
[
1
0
]
b
y
p
r
o
v
id
in
g
a
r
o
b
u
s
t
s
ec
u
r
it
y
s
ch
e
m
e.
Ho
w
e
v
er
,
in
ea
r
l
y
p
r
o
p
o
s
ed
C
E
s
ch
e
m
e
s
in
cl
u
d
i
n
g
Du
p
L
E
SS
,
a
u
s
er
m
a
y
d
ec
r
y
p
t
th
e
d
ata
af
ter
lo
s
in
g
h
is
o
w
n
er
s
h
ip
o
f
u
p
lo
ad
ed
d
ata,
i.e
.
,
o
w
n
er
s
h
ip
r
ev
o
ca
tio
n
.
I
n
th
is
p
ap
er
,
a
s
ec
u
r
e
d
ed
u
p
licatio
n
s
ch
e
m
e
is
p
r
o
p
o
s
ed
to
s
to
r
e
en
cr
y
p
ted
d
a
ta.
I
t
e
n
s
u
r
es
th
e
au
th
o
r
ized
ac
ce
s
s
to
t
h
e
s
h
ar
ed
d
ata
w
h
ic
h
i
s
e
x
a
m
in
ed
a
s
a
m
aj
o
r
ch
allen
g
e
f
o
r
s
ec
u
r
e
a
n
d
e
f
f
icien
t
C
S
s
er
v
ice
s
[
1
1
]
.
T
h
e
o
w
n
er
s
h
ip
ch
an
g
es
d
y
n
a
m
ical
l
y
h
e
n
ce
ea
ch
o
w
n
er
s
h
ip
g
r
o
u
p
is
h
an
d
led
b
y
a
g
r
o
u
p
k
ey
m
an
a
g
e
m
en
t
m
ec
h
a
n
i
s
m
.
T
h
e
p
r
o
p
o
s
ed
s
ch
e
m
e
g
u
ar
an
tee
s
n
o
lea
k
i
n
g
o
f
an
y
co
n
f
id
en
tia
l
in
f
o
r
m
a
tio
n
.
T
h
e
p
ap
er
is
o
r
g
an
ized
as
f
o
llo
w
s
:
r
elate
d
w
o
r
k
is
g
i
v
en
in
s
ec
tio
n
2
.
Se
ctio
n
3
d
escr
ib
es
t
h
e
s
y
s
te
m
m
o
d
el
a
n
d
s
ec
u
r
it
y
r
eq
u
ir
e
m
en
ts
.
C
h
ap
ter
4
ex
p
lain
s
t
h
e
p
r
eli
m
i
n
ar
ies
an
d
n
o
tat
io
n
s
.
T
h
e
p
r
o
p
o
s
ed
s
ec
u
r
e
d
e
d
u
p
licatio
n
s
c
h
e
m
e
is
d
em
o
n
s
tr
ated
in
s
ec
tio
n
5
.
T
h
e
s
ec
u
r
it
y
r
esu
lt
s
o
f
th
e
p
r
o
p
o
s
ed
s
ch
e
m
e
ar
e
d
escr
ib
ed
i
n
s
ec
tio
n
6
.
Fin
all
y
,
s
ec
tio
n
7
co
n
cl
u
d
es th
e
p
ap
er
.
2.
RE
L
AT
E
D
WO
RK
Data
d
ed
u
p
licatio
n
i
s
an
ad
v
an
ce
d
d
ata
co
m
p
r
ess
io
n
tec
h
n
iq
u
e
w
h
ic
h
id
en
ti
f
ie
s
t
h
e
r
ed
u
n
d
a
n
t
d
ata
b
y
co
m
p
ar
i
n
g
t
h
e
h
a
s
h
v
alu
e
s
o
f
d
ata
ch
u
n
k
s
.
I
t
s
to
r
es
o
n
l
y
t
h
e
u
n
iq
u
e
co
p
y
an
d
cr
ea
tes
lo
g
ical
lin
k
s
f
o
r
r
ed
u
n
d
a
n
t
co
p
ies
in
s
tead
o
f
s
to
r
in
g
t
h
e
m
[
9
,
1
2
]
.
B
y
th
i
s
,
it
r
ed
u
ce
s
t
h
e
v
o
lu
m
e
o
f
d
ata
s
to
r
ed
an
d
as
a
r
esu
lt,
t
h
e
r
u
n
n
in
g
co
s
t
o
f
th
e
s
y
s
te
m
d
ec
r
ea
s
e
s
.
Gen
er
all
y
,
it
is
ap
p
lied
w
h
er
e
th
e
d
ata
is
s
to
r
e
d
o
r
t
r
an
s
m
itt
ed
in
C
S
[
1
3
]
.
I
t
is
s
u
cc
e
s
s
f
u
ll
y
ad
o
p
ted
b
y
b
ac
k
u
p
s
to
r
ag
e
in
clo
u
d
s
to
m
an
a
g
e
p
h
y
s
ical
ca
p
ac
it
y
a
n
d
n
e
t
w
o
r
k
tr
af
f
ic
[
1
4
,
1
5
]
.
I
t
ca
n
b
e
d
iv
id
ed
in
to
t
w
o
ca
teg
o
r
ies:
d
ed
u
p
licatio
n
o
v
er
u
n
en
cr
y
p
ted
d
ata
a
n
d
d
ed
u
p
licatio
n
o
v
er
en
cr
y
p
ted
d
ata.
Data
p
r
iv
ac
y
is
al
s
o
an
i
m
p
o
r
t
an
t
is
s
u
e
i
n
C
S.
I
t
p
r
o
tects
th
e
d
ata
f
r
o
m
m
alicio
u
s
attac
k
er
s
o
u
ts
id
e
an
d
in
s
id
e
th
e
C
S.
Har
n
ic
k
et
al.
[
1
6
]
u
s
e
d
ata
d
ed
u
p
licatio
n
as
a
s
id
e
ch
an
n
el
to
r
ev
ea
l
in
f
o
r
m
a
tio
n
to
attac
k
er
s
.
T
h
e
y
u
s
e
a
r
an
d
o
m
ized
th
r
es
h
o
ld
to
p
er
f
o
r
m
an
at
tack
o
n
C
S
s
er
v
ices
.
W
h
en
a
m
alicio
u
s
u
s
er
te
m
p
o
r
ar
ily
e
m
b
r
ac
e
s
a
s
er
v
er
an
d
g
ets
t
h
e
h
as
h
v
al
u
e
s
o
f
d
ata
in
C
S,
th
e
n
h
e
ca
n
d
o
w
n
lo
ad
all
th
ese
d
ata.
A
s
i
m
ila
r
attac
k
s
ce
n
ar
io
w
a
s
b
r
o
u
g
h
t
f
o
r
w
ar
d
o
n
C
S
t
h
at
u
s
es
d
ed
u
p
lica
tio
n
ac
r
o
s
s
m
u
ltip
le
u
s
er
s
.
He
n
ce
b
y
o
b
ta
in
i
n
g
a
n
o
n
l
y
h
as
h
v
alu
e
f
o
r
a
s
p
ec
if
ic
d
ata,
th
e
m
alicio
u
s
u
s
er
b
ec
o
m
e
s
s
o
p
o
w
er
f
u
l
th
at
h
e
ca
n
ac
ce
s
s
all
d
ata
th
at
is
s
to
r
ed
in
C
S.
Dr
o
p
b
o
x
w
a
s
ac
ce
s
s
ed
u
s
in
g
m
a
n
ip
u
latio
n
o
f
th
e
h
as
h
v
alu
e
a
ttack
b
y
Mu
llaza
n
i
e
t
a
l.
[
1
1
]
.
He
s
h
o
w
ed
th
at
if
t
h
e
m
al
icio
u
s
u
s
er
r
etr
iev
es
th
e
S
H
A
-
2
5
6
h
ash
v
al
u
e
s
o
f
f
ile
'
s
c
h
u
n
k
s
t
h
en
o
th
er
Dr
o
p
b
o
x
u
s
er
’
s
d
ata
m
a
y
b
e
ac
ce
s
s
ed
b
y
s
p
o
o
f
in
g
t
h
e
h
a
s
h
v
al
u
e
attac
k
.
T
h
e
n
o
tio
n
o
f
p
r
o
o
f
-
of
-
o
w
n
er
s
h
ip
is
p
r
o
p
o
s
ed
b
y
Hale
v
i
et
a
l
.
[
1
7
]
to
o
v
er
co
m
e
t
h
ese
at
tac
k
s
.
I
n
t
h
is
,
th
e
f
ile
is
h
eld
u
s
i
n
g
Me
r
k
le
tr
ee
s
in
s
tead
o
f
h
a
s
h
v
al
u
e.
Ded
u
p
licatio
n
o
v
er
u
n
e
n
cr
y
p
ted
d
ata
s
to
r
es
t
h
e
p
lai
n
d
ata
in
C
S a
n
d
p
lain
d
ata
is
s
e
n
t
to
th
e
u
s
er
af
ter
v
er
if
y
i
n
g
h
i
s
o
w
n
er
s
h
ip
h
e
n
ce
C
S s
h
o
u
ld
b
e
tr
u
s
ted
.
So
u
s
er
s
ar
e
al
w
a
y
s
m
o
r
e
co
n
ce
r
n
ab
o
u
t
th
e
ir
p
r
iv
ac
y
.
T
o
k
ee
p
th
eir
d
ata
p
r
iv
ac
y
,
u
s
er
s
m
a
y
e
n
cr
y
p
t
t
h
eir
d
ata
b
ef
o
r
e
s
to
r
in
g
to
C
S.
Di
f
f
er
en
t
u
s
er
s
u
s
e
d
i
f
f
er
e
n
t
m
ec
h
a
n
i
s
m
s
to
en
cr
y
p
t
t
h
e
d
ata.
Du
e
to
th
is
,
d
if
f
er
en
t
cip
h
er
tex
t
s
ar
e
g
en
er
ated
f
o
r
th
e
s
a
m
e
d
at
a
w
h
ic
h
m
a
k
es
t
h
e
d
ed
u
p
licati
o
n
in
f
ea
s
ib
le.
T
o
o
v
er
co
m
e
t
h
i
s
p
r
o
b
lem
,
Do
u
ce
u
r
et
al.
[
5
]
p
r
o
p
o
s
ed
a
n
e
w
ap
p
r
o
ac
h
k
n
o
w
n
as
co
n
v
er
g
e
n
t
e
n
cr
y
p
tio
n
.
I
n
C
E
,
d
ata
o
w
n
er
g
en
er
ates
its
o
w
n
k
e
y
f
r
o
m
th
e
d
ata
M
,
()
K
H
M
w
h
er
e
H
b
e
a
h
ash
f
u
n
ctio
n
.
T
h
e
k
ey
K
an
d
d
ata
M
ar
e
m
ap
p
ed
in
to
cip
h
er
tex
t
(
,
)
C
E
K
M
,
w
h
er
e
E
is
a
b
lo
ck
cip
h
er
.
T
h
en
o
n
l
y
K
is
m
ain
tain
ed
,
M
is
d
elete
d
an
d
C
is
u
p
lo
ad
ed
t
o
C
S.
I
f
a
n
o
th
er
u
s
er
en
cr
y
p
t
s
th
e
s
a
m
e
d
ata
th
e
n
t
h
e
s
a
m
e
cip
h
er
tex
t
w
ill
b
e
g
e
n
er
ated
.
Hen
c
e
if
C
S
r
ec
ei
v
es
t
h
e
C
f
r
o
m
an
o
t
h
er
u
s
er
th
e
n
C
S
w
il
l
n
o
t
s
to
r
e
it,
o
n
l
y
m
eta
-
d
ata
w
i
ll
b
e
u
p
d
ated
.
On
l
y
a
u
t
h
o
r
ized
u
s
er
s
ca
n
r
eq
u
est an
d
d
o
w
n
lo
ad
cip
h
er
te
x
t
C
an
d
d
ec
r
y
p
t
it
w
it
h
K
.
Ho
w
e
v
er
,
C
E
s
u
f
f
er
s
f
r
o
m
t
h
e
p
o
is
o
n
attac
k
[
1
8
]
.
I
t
m
ai
n
l
y
ar
is
es
th
e
ta
g
co
n
s
i
s
ten
c
y
p
r
o
b
lem
i
n
w
h
ic
h
m
alic
io
u
s
u
s
er
u
p
lo
ad
s
m
alicio
u
s
l
y
g
e
n
er
ated
cip
h
er
tex
t
an
d
its
tag
.
W
h
e
n
an
o
t
h
er
u
s
er
tr
ies
to
s
to
r
e
h
is
cip
h
er
tex
t;
th
e
s
er
v
er
f
i
n
d
s
t
h
e
s
a
m
e
tag
a
n
d
d
elete
s
it.
W
h
e
n
a
u
s
er
d
o
w
n
lo
ad
s
th
i
s
cip
h
er
tex
t a
n
d
d
ec
r
y
p
t
s
it,
th
e
m
es
s
ag
e
is
n
o
t
f
o
u
n
d
o
r
ig
in
al.
B
y
th
is
,
t
h
e
i
n
te
g
r
it
y
o
f
d
ata
an
d
C
S
i
s
lo
s
t.
C
E
d
o
es
n
o
t
o
f
f
er
r
eq
u
ir
ed
s
ec
u
r
it
y
,
an
d
it
is
f
o
u
n
d
v
u
l
n
e
r
ab
le
to
p
o
is
o
n
attac
k
[
5
]
.
T
h
is
s
ec
u
r
it
y
f
la
w
is
r
eso
lv
ed
b
y
o
b
liv
io
u
s
p
s
eu
d
o
-
r
an
d
o
m
f
u
n
ctio
n
(
O
-
P
R
F)
b
a
s
ed
Du
p
L
E
SS
[
1
0
]
.
I
t
r
ep
lac
ed
th
e
d
ata
d
er
iv
ed
en
cr
y
p
tio
n
k
e
y
w
it
h
t
h
e
k
e
y
g
en
er
ated
b
y
th
e
in
ter
ac
tio
n
b
e
t
w
ee
n
t
h
e
k
e
y
s
er
v
er
a
n
d
th
e
u
s
er
.
I
t
p
r
o
v
id
es
s
ec
u
r
it
y
a
g
a
i
n
s
t
p
o
is
o
n
attac
k
,
b
u
t
th
e
k
e
y
is
s
till
d
eter
m
in
i
s
tic.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J
I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
I
SS
N:
2252
-
8776
A
s
ec
u
r
e
d
ed
u
p
lica
tio
n
s
ch
em
e
fo
r
en
cryp
ted
d
a
t
a
(
V
is
h
a
l P
a
s
s
r
ich
a
)
79
3.
SYST
E
M
M
O
DE
L
AND
S
E
CURI
T
Y
RE
Q
U
I
R
E
M
E
NT
I
n
th
i
s
s
ec
tio
n
,
d
ata
d
ed
u
p
lic
atio
n
ar
ch
itect
u
r
e
an
d
s
ec
u
r
it
y
r
eq
u
ir
e
m
e
n
t
s
ar
e
d
escr
ib
ed
.
B
ased
o
n
g
r
an
u
lar
it
y
,
d
ed
u
p
licatio
n
m
o
d
els
ar
e
d
iv
id
ed
in
to
t
w
o
ca
teg
o
r
ies:
c
o
u
r
s
e
g
r
ain
ed
an
d
f
in
e
g
r
ain
ed
.
Fo
r
th
e
s
ak
e
o
f
s
i
m
p
l
icit
y
,
co
ar
s
e
-
g
r
ain
ed
d
ed
u
p
licatio
n
is
p
r
ef
er
r
ed
.
3
.
1
.
Sy
s
t
em
De
s
cr
iptio
n
Fig
u
r
e
1
s
h
o
w
s
th
e
s
y
s
te
m
m
o
d
el
o
f
th
e
d
ata
d
ed
u
p
licati
o
n
s
y
s
te
m
f
o
r
clo
u
d
s
to
r
ag
e,
h
av
i
n
g
th
e
f
o
llo
w
in
g
e
n
titi
e
s
:
Fig
u
r
e
1
.
T
h
e
m
o
d
el
o
f
d
ata
d
ed
u
p
licatio
n
s
y
s
te
m
i.
Data
o
w
n
er
:
T
h
e
d
ata
o
w
n
er
u
p
lo
ad
s
th
e
d
ata
t
o
C
S.
He
m
a
y
en
cr
y
p
t
h
is
d
ata
b
ef
o
r
e
u
p
lo
ad
in
g
a
n
d
u
p
lo
ad
s
cip
h
er
tex
t
to
C
S w
it
h
its
in
d
e
x
in
f
o
r
m
atio
n
.
I
f
t
h
e
d
ata
u
p
lo
ad
ed
b
y
d
ata
o
w
n
er
d
o
n
o
t
a
lr
ea
d
y
r
e
s
id
e
in
C
S,
th
en
d
ata
o
w
n
er
is
k
n
o
w
n
a
s
in
itia
l
u
p
lo
ad
er
o
th
er
w
is
e
h
e
is
ca
lled
as
th
e
s
u
b
s
eq
u
e
n
t
u
p
lo
ad
er
.
An
o
w
n
er
s
h
ip
g
r
o
u
p
is
a
g
r
o
u
p
o
f
d
ata
o
w
n
er
s
w
h
o
s
h
ar
e
th
e
s
a
m
e
d
ata
in
C
S.
ii.
C
lo
u
d
Ser
v
er
(
C
SS
)
:
C
lo
u
d
s
er
v
er
an
d
clo
u
d
s
to
r
ag
e
a
r
e
t
w
o
d
if
f
er
en
t
en
t
ities
.
C
S
S
p
er
f
o
r
m
s
t
h
e
d
ed
u
p
licatio
n
p
r
o
ce
s
s
o
n
u
p
lo
ad
ed
d
ata
an
d
if
th
is
d
ata
is
n
o
t
p
r
esen
t
in
C
S
th
en
C
SS
s
to
r
es
th
is
in
C
S.
I
t
m
an
a
g
e
s
t
h
e
li
s
t
o
f
o
w
n
er
s
f
o
r
s
to
r
ed
d
ata
an
d
also
co
n
tr
o
ls
th
e
ac
ce
s
s
of
s
to
r
ed
d
ata
u
s
i
n
g
t
h
e
li
s
t
o
f
o
w
n
er
s
h
ip
.
I
t
is
a
g
r
o
u
p
k
ey
au
th
o
r
it
y
t
h
at
m
a
in
ta
in
s
g
r
o
u
p
k
ey
f
o
r
ea
ch
o
w
n
er
s
h
ip
g
r
o
u
p
.
I
t
ex
ec
u
tes
ass
i
g
n
ed
tas
k
s
h
o
n
e
s
tl
y
b
u
t
lea
r
n
s
as m
u
c
h
i
n
f
o
r
m
atio
n
ab
o
u
t
th
e
en
cr
y
p
ted
co
n
te
n
ts
a
s
p
o
s
s
ib
le.
W
h
en
t
h
e
d
ata
o
w
n
er
s
r
eq
u
est
to
d
o
w
n
lo
ad
a
f
ile,
af
ter
au
th
e
n
ticat
in
g
th
e
o
w
n
er
’
s
id
en
t
it
y
,
it
p
r
o
v
id
es
t
h
e
f
ile
’
s
ac
ce
s
s
.
iii.
C
lo
u
d
Sto
r
ag
e
(
C
S):
C
S i
s
a
lo
g
ical
s
er
v
er
m
a
n
ag
e
d
b
y
t
h
e
cl
o
u
d
s
er
v
ice
p
r
o
v
id
er
o
v
er
th
e
i
n
ter
n
et.
I
t
o
f
f
er
s
s
i
m
ilar
f
u
n
ctio
n
al
it
y
as
a
tr
ad
itio
n
al
s
er
v
er
.
I
t
o
f
f
er
s
d
is
tr
ib
u
ted
s
to
r
ag
e
w
it
h
i
m
m
ed
i
ate
ac
ce
s
s
.
I
t is
h
ig
h
l
y
co
n
f
i
g
u
r
ab
le
an
d
i
n
ter
c
h
an
g
ea
b
le.
3
.
2
.
Securit
y
Require
m
e
nts
T
h
e
f
o
llo
w
i
n
g
s
ec
u
r
it
y
r
eq
u
ir
e
m
en
ts
ar
e
tr
ied
to
ac
h
iev
e
i
n
t
h
is
p
ap
er
.
Data
C
o
n
f
id
en
tialit
y
:
T
h
e
u
n
a
u
th
o
r
ized
an
d
m
alicio
u
s
u
s
er
s
h
o
u
ld
b
e
r
estricte
d
to
ch
an
g
e
an
d
k
n
o
w
ab
o
u
t
th
e
en
cr
y
p
ted
d
ata.
I
f
d
ata
s
to
r
ed
in
C
S
ar
e
m
alicio
u
s
l
y
m
o
d
i
f
ied
,
th
en
it
s
in
te
g
r
it
y
m
a
y
b
e
l
o
s
t.
T
h
e
d
ed
u
p
licatio
n
alg
o
r
it
h
m
s
s
h
o
u
ld
b
e
ab
le
to
p
r
o
tect
it f
r
o
m
an
y
p
o
is
o
n
attac
k
s
.
I
t o
n
l
y
allo
ws au
t
h
en
tic
u
s
er
s
to
ac
ce
s
s
d
ata
an
d
g
u
ar
an
tee
s
th
a
t th
e
d
ata
u
p
lo
ad
ed
in
C
S
ar
e
n
o
t a
lter
ed
.
C
o
llu
s
io
n
R
esi
s
ta
n
ce
: T
h
e
d
ata
o
w
n
er
s
w
an
t to
k
ee
p
th
eir
p
r
iv
ac
y
.
Ho
w
e
v
er
,
m
al
icio
u
s
u
s
er
s
w
h
o
d
o
n
o
t
h
a
v
e
v
alid
o
w
n
er
s
h
ip
o
f
d
ata
m
a
y
ac
ce
s
s
it f
r
o
m
C
S.
He
n
ce
C
SS
m
u
s
t
r
estrict
t
h
e
m
to
d
ec
r
y
p
t
o
r
ac
ce
s
s
it.
B
ac
k
w
ar
d
an
d
Fo
r
w
ar
d
Secr
ec
y
:
T
o
r
estrict
an
y
u
s
er
f
r
o
m
a
cc
ess
i
n
g
p
lai
n
tex
t
o
f
th
e
o
u
t
s
o
u
r
ce
d
d
ata
b
ef
o
r
e
u
p
l
o
ad
in
g
i
s
k
n
o
w
n
a
s
b
ac
k
w
ar
d
s
ec
r
ec
y
.
T
o
r
estrict
an
y
u
s
er
,
w
h
o
h
as
d
elete
d
o
r
m
o
d
i
f
ied
t
h
e
d
ata
in
C
S
f
r
o
m
ac
ce
s
s
in
g
t
h
e
o
u
ts
o
u
r
ce
d
d
ata
af
ter
d
eletio
n
o
r
m
o
d
if
icatio
n
is
k
n
o
w
n
a
s
f
o
r
w
ar
d
s
ec
r
ec
y
.
4.
P
RE
L
I
M
I
NARIE
S
I
n
th
is
s
ec
tio
n
,
t
h
e
b
asic
d
e
f
i
n
it
io
n
s
o
f
a
s
ec
u
r
e
d
ed
u
p
licatio
n
s
ch
e
m
e
f
o
r
en
cr
y
p
ted
d
ata
ar
e
d
escr
ib
ed
.
4
.
1
.
No
t
a
t
io
ns
T
h
e
r
an
d
o
m
an
d
u
n
if
o
r
m
s
ele
ctio
n
o
f
th
e
ele
m
e
n
t
x
f
r
o
m
t
h
e
f
in
ite
s
e
t
S
is
d
en
o
ted
by
S
x
.
I
t
m
ea
n
s
o
n
e
v
al
u
e
f
r
o
m
S
is
r
an
d
o
m
l
y
ass
ig
n
ed
to
x
.
1
(
,
...
,
)
n
Al
y
x
x
is
d
en
o
ted
as
an
alg
o
r
ith
m
Al
w
h
ic
h
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
2
5
2
-
8776
I
n
t J
I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
,
Vo
l.
8
,
No
.
2,
A
u
g
u
s
t
201
9
:
77
–
86
80
r
u
n
s
o
n
th
e
in
p
u
t
s
et
1
(
,
.
.
.
,
)
n
xx
an
d
its
r
esu
lt
is
as
s
ig
n
ed
to
y
.
1
m
ea
n
s
a
s
tr
in
g
o
f
len
g
th
h
av
in
g
all
1
s
.
T
h
e
co
n
ca
ten
atio
n
o
f
t
w
o
s
tr
in
g
s
a
an
d
b
is
ex
p
r
ess
ed
as
ab
.
1
(
,
.
.
.
,
)
n
uu
is
a
w
o
r
ld
o
f
u
s
er
d
en
o
ted
b
y
U
.
T
h
e
id
en
tit
y
o
f
th
e
i
th
u
s
er
i
u
is
d
ef
in
ed
as
i
ID
.
L
et
a
GU
is
a
g
r
o
u
p
o
f
u
s
er
s
h
a
v
i
n
g
d
at
a
a
M
an
d
,
{}
a
aa
L
T
G
is
t
h
e
o
w
n
er
s
h
ip
li
s
t
of
a
M
.
Her
e
a
T
d
en
o
tes
t
h
e
tag
an
d
C
S
S
m
ai
n
tai
n
s
t
h
e
o
w
n
er
s
h
ip
lis
t.
G
a
K
is
an
o
w
n
er
s
h
ip
g
r
o
u
p
k
e
y
,
g
en
er
all
y
s
h
ar
ed
b
y
v
alid
o
w
n
er
s
o
f
a
G
.
4
.
2
.
Def
ini
t
io
ns
A
s
ec
u
r
e
d
ed
u
p
licatio
n
s
c
h
e
m
e
f
o
r
en
cr
y
p
ted
d
ata
is
d
ef
in
e
d
in
th
is
s
ec
t
io
n
.
T
h
e
alg
o
r
ith
m
s
u
s
ed
in
th
is
s
ch
e
m
e
ar
e
d
escr
ib
ed
b
elo
w
:
a.
()
K
E
Y
K
E
Y
G
e
n
u
:
T
h
e
s
et
o
f
u
s
er
u
is
g
iv
e
n
as
in
p
u
t
to
th
e
(
)
K
EY
Ge
n
alg
o
r
it
h
m
.
I
t
g
e
n
er
ates
K
E
Ys
co
r
r
esp
o
n
d
in
g
to
ea
ch
u
s
er
s
et
o
f
u
f
o
r
s
ec
u
r
e
o
w
n
er
s
h
i
p
g
r
o
u
p
k
e
y
d
is
tr
ib
u
tio
n
.
b.
(
,
1
)
i
C
E
n
c
M
:
T
h
e
d
ata
M
an
d
s
ec
u
r
it
y
p
ar
am
e
ter
is
g
i
v
en
as
in
p
u
t
to
(
)
E
n
c
f
u
n
ctio
n
to
en
cr
y
p
t
it in
to
th
e
co
r
r
esp
o
n
d
in
g
cip
h
e
r
tex
t
i
C
.
i
C
is
co
m
p
o
s
ed
o
f
en
cr
y
p
t
ed
d
ata
an
d
tag
in
f
o
r
m
ati
o
n
i
n
d
ex
in
g
.
c.
'
R
e
(
,
)
ii
C
E
n
c
C
G
:
T
h
e
cip
h
er
tex
t
i
C
an
d
o
w
n
er
s
h
ip
g
r
o
u
p
G
is
g
iv
en
as
in
p
u
t
t
o
R
e
(
)
Enc
f
o
r
m
ap
p
in
g
t
h
e
cip
h
er
te
x
t
i
C
in
to
co
r
r
esp
o
n
d
in
g
e
n
cr
y
p
ted
cip
h
er
tex
t
'
i
C
.
T
h
e
ch
ar
ac
ter
is
tic
o
f
e
n
cr
y
p
ted
cip
h
er
tex
t
'
i
C
is
th
at
v
alid
o
w
n
er
s
in
G
o
n
l
y
d
o
its
d
ec
r
y
p
tio
n
.
d.
'
(
,
,
)
i
M
D
e
c
C
K
P
k
:
T
h
e
en
cr
y
p
ted
cip
h
er
tex
t
'
i
C
,
m
ess
a
g
e
en
cr
y
p
tio
n
k
e
y
K
,
an
d
a
s
et
o
f
k
e
y
s
Pk
is
s
u
p
p
lied
as
in
p
u
t
to
(
)
D
e
c
f
u
n
cti
o
n
to
d
ec
r
y
p
t
'
i
C
in
to
th
e
co
r
r
es
p
o
n
d
in
g
m
ess
a
g
e
M
.
No
te
th
at
K
s
h
o
u
ld
b
e
d
er
iv
ed
f
r
o
m
d
ata
M
.
5.
P
RO
P
O
SE
D
DE
DUP
L
I
CA
T
I
O
N
SCH
E
M
E
I
n
th
is
p
ap
er
,
a
s
ec
u
r
e
d
ed
u
p
licatio
n
s
ch
e
m
e
f
o
r
en
cr
y
p
te
d
d
ata
is
p
r
o
p
o
s
ed
th
at
o
f
f
er
s
d
y
n
a
m
ic
o
w
n
er
s
h
ip
m
a
n
a
g
e
m
en
t
ca
p
a
b
ilit
y
.
R
a
n
d
o
m
ized
C
E
alg
o
r
ith
m
[
1
9
]
is
ap
p
lied
in
th
e
p
r
o
p
o
s
ed
s
ch
e
m
e
to
r
an
d
o
m
ize
th
e
e
n
cr
y
p
ted
d
ata.
I
t
p
o
w
er
ed
th
e
p
r
o
p
o
s
ed
s
y
s
te
m
to
d
ef
e
n
d
ag
ai
n
s
t
p
o
is
o
n
at
t
ac
k
s
.
R
e
-
e
n
cr
y
p
tio
n
m
o
d
u
le
is
also
co
m
b
in
ed
in
th
e
p
r
o
p
o
s
ed
s
ch
e
m
e
f
o
r
o
w
n
er
r
ev
o
ca
tio
n
.
T
h
e
o
u
ts
o
u
r
ce
d
cip
h
er
tex
t
is
r
e
-
en
cr
y
p
ted
u
s
i
n
g
t
h
is
m
o
d
u
le
f
o
r
o
w
n
er
r
ev
o
ca
tio
n
.
I
t
also
d
i
s
tr
ib
u
tes
t
h
e
r
e
-
en
cr
y
p
tio
n
k
e
y
to
au
th
e
n
tic
o
w
n
er
s
u
s
i
n
g
C
SS
.
Fig
u
r
e
2
ill
u
s
tr
ate
s
t
h
e
ar
ch
itec
tu
r
e
o
f
t
h
e
p
r
o
p
o
s
ed
s
ch
e
m
e.
T
h
e
o
w
n
er
s
h
ip
lis
t
f
o
r
ea
ch
d
ata
is
m
ai
n
tai
n
ed
b
y
th
e
C
SS
to
h
a
n
d
le
d
y
n
a
m
ic
o
w
n
er
s
h
ip
m
a
n
ag
e
m
e
n
t.
A
s
C
SS
g
et
s
o
w
n
er
s
h
ip
lis
t,
it
d
o
es
n
o
t
d
is
o
b
ey
th
e
s
ec
u
r
it
y
r
eq
u
ir
e
m
en
t.
I
t
o
n
l
y
al
lo
w
s
t
h
e
r
e
-
en
cr
y
p
ted
cip
h
er
tex
t,
an
d
r
est
in
f
o
r
m
at
io
n
r
e
g
ar
d
in
g
d
ata
en
cr
y
p
tio
n
is
m
ea
n
i
n
g
le
s
s
.
Fig
u
r
e
2
.
Sch
e
m
e
o
v
er
v
ie
w
a
n
d
co
r
r
esp
o
n
d
in
g
s
ec
u
r
it
y
5
.
1
.
Sy
s
t
em
Co
n
s
t
ruct
io
n
L
et
()
K
EM
d
en
o
tes
s
y
m
m
etr
ic
en
cr
y
p
tio
n
[
2
0
]
w
it
h
t
h
e
k
e
y
K
o
f
d
a
t
a
M
w
h
er
e
()
K
E
is
a
b
lo
ck
cip
h
er
.
A
cr
y
p
to
g
r
ap
h
ic
h
as
h
f
u
n
ct
io
n
:
0
,
1
{}
k
H
is
u
s
ed
to
d
er
iv
e
an
en
cr
y
p
tio
n
k
e
y
a
n
d
tag
f
r
o
m
t
h
e
m
e
s
s
a
g
e
an
d
k
d
en
o
tes th
e
le
n
g
th
o
f
th
e
k
e
y
K
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J
I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
I
SS
N:
2252
-
8776
A
s
ec
u
r
e
d
ed
u
p
lica
tio
n
s
ch
em
e
fo
r
en
cryp
ted
d
a
t
a
(
V
is
h
a
l P
a
s
s
r
ich
a
)
81
K
ey
Gen
era
tio
n
:
T
h
e
K
E
Ys
f
o
r
th
e
u
s
er
s
i
n
u
ar
e
g
en
er
ated
b
y
C
SS
b
y
r
u
n
n
in
g
()
K
E
Y
G
e
n
u
.
I
n
itiall
y
,
a
b
in
ar
y
K
E
Y
tr
ee
is
d
esi
g
n
ed
f
o
r
th
e
w
o
r
ld
o
f
u
s
er
s
u
b
y
C
SS
.
Fig
u
r
e
3
s
h
o
w
s
th
e
b
i
n
ar
y
K
E
Y
tr
ee
an
d
u
s
er
s
u
ar
e
g
ettin
g
o
w
n
er
s
h
ip
g
r
o
u
p
k
e
y
s
th
r
o
u
g
h
th
is
tr
ee
.
E
ac
h
u
s
er
(
n
o
d
e)
j
v
h
as
a
K
E
Y
,
r
ep
r
es
en
ted
as
K
E
Y
j
.
P
ath
k
e
y
s
ar
e
th
e
s
et
o
f
k
e
y
s
f
r
o
m
leaf
to
r
o
o
t,
an
d
it
is
s
ep
ar
atel
y
m
ai
n
tai
n
ed
b
y
ea
ch
u
s
er
(
n
o
d
e)
.
Fig
u
r
e
3
s
h
o
w
s
h
o
w
3
u
k
ee
p
s
K
E
Y
6
,
K
E
Y
3
,
an
d
K
E
Y
1
as
its
p
at
h
k
e
y
s
3
Pk
.
Fo
r
j
u
U
,
th
e
p
ath
k
e
y
s
of
j
u
is
d
en
o
te
d
by
j
Pk
.
C
SS
co
n
s
tr
u
c
ts
t
h
e
K
E
Y
tr
ee
in
th
e
f
o
llo
w
i
n
g
m
a
n
n
er
s
:
1.
E
ac
h
u
s
er
of
U
g
et
s
a
leaf
n
o
d
e.
R
an
d
o
m
l
y
g
en
er
ated
k
e
y
s
ar
e
ass
i
g
n
ed
to
ea
ch
n
o
d
e
o
f
th
e
tr
ee
.
2.
E
ac
h
u
s
er
j
u
U
g
et
s
s
ec
u
r
el
y
t
h
e
p
ath
k
e
y
j
Pk
.
I
n
th
e
re
-
en
cr
y
p
tio
n
p
h
ase,
C
SS
u
s
e
s
t
h
e
p
ath
k
e
y
s
as
K
E
Y
s
to
en
cr
y
p
t t
h
e
o
w
n
er
s
h
ip
g
r
o
u
p
k
e
y
s
.
Fig
u
r
e
3
.
KE
Y
tr
ee
f
o
r
o
w
n
er
s
h
ip
g
r
o
u
p
k
e
y
d
is
tr
ib
u
tio
n
Da
ta
E
n
cryp
tio
n
:
I
f
a
d
ata
o
w
n
er
j
u
w
an
t
s
to
u
p
lo
ad
d
ata
M
to
C
S th
en
h
e
r
u
n
s
(
,
1
)
E
n
c
M
m
o
d
u
le
to
en
cr
y
p
t
M
.
()
{
0
,
1
}
k
L
d
en
o
tes
th
e
r
an
d
o
m
e
n
cr
y
p
tio
n
k
e
y
an
d
al
g
o
r
it
h
m
()
k
d
r
iv
es
th
e
le
n
g
th
o
f
t
h
e
en
cr
y
p
tio
n
k
e
y
.
()
aa
K
H
M
is
co
m
p
u
te
d
f
r
o
m
a
M
.
I
t
is
u
s
ed
to
en
cr
y
p
t
m
e
s
s
a
g
e
en
cr
y
p
tio
n
k
e
y
L
.
()
aa
T
H
K
is
co
m
p
u
ted
f
r
o
m
a
K
as
in
d
ex
in
g
in
f
o
r
m
atio
n
o
f
d
ata.
1
()
a
L
a
i
C
E
M
an
d
2
aa
i
C
L
K
e
n
cr
y
p
t
th
e
d
ata
an
d
e
n
cr
y
p
tio
n
k
e
y
r
e
s
p
ec
tiv
el
y
.
T
h
e
cip
h
er
te
x
t
a
i
C
is
c
o
n
s
tr
u
cted
b
y
co
n
ca
te
n
atio
n
o
f
1
a
i
C
an
d
2
a
i
C
,
i.e
.
,
12
a
a
a
i
i
i
C
C
C
.
Af
ter
g
en
er
atio
n
o
f
1
a
i
C
,
a
a
a
i
u
p
lo
a
d
s
T
C
I
D
ar
e
s
en
t
to
C
S.
Af
ter
t
h
at
a
M
is
d
elete
d
to
s
a
v
e
s
to
r
a
g
e
s
p
ac
e
an
d
a
K
is
k
ep
t.
If
a
u
is
th
e
f
ir
s
t
u
p
lo
ad
er
th
en
clo
u
d
s
er
v
er
em
b
ed
s
a
ID
in
to
a
G
an
d
g
en
er
ates
,}
{
aa
a
L
T
G
,
an
d
s
to
r
e
a
i
C
in
C
S o
th
er
w
i
s
e
it
e
m
b
ed
s
a
ID
to
a
G
an
d
d
is
ca
r
d
s
a
i
C
.
Da
ta
R
e
-
E
n
cryp
tio
n
:
C
lo
u
d
s
er
v
er
r
u
n
s
(
,
)
Re
a
a
i
CG
E
n
c
to
r
e
-
en
cr
y
p
t
th
e
cip
h
er
tex
t
a
i
C
u
s
in
g
th
e
o
w
n
er
s
h
ip
g
r
o
u
p
in
f
o
r
m
atio
n
b
ef
o
r
e
s
h
ar
in
g
.
T
h
e
m
a
in
o
b
j
e
ctiv
e
o
f
t
h
e
re
-
en
cr
y
p
tio
n
al
g
o
r
ith
m
is
to
co
n
tr
o
l
th
e
d
y
n
a
m
icall
y
co
n
tr
o
lled
o
w
n
er
s
o
f
o
u
t
s
o
u
r
ce
d
d
ata.
T
h
e
r
e
-
en
cr
y
p
tio
n
i
s
d
o
n
e
in
t
h
e
f
o
l
lo
w
i
n
g
s
tep
s
:
1.
11
'
()
a
Gk
aa
ii
C
E
C
is
g
e
n
er
ated
b
y
r
e
-
en
cr
y
p
tin
g
th
e
cip
h
er
te
x
t
1
a
i
C
w
it
h
th
e
r
a
n
d
o
m
o
w
n
er
s
h
ip
g
r
o
u
p
a
Gk
.
2.
Select
th
e
r
o
o
t
n
o
d
es
i
n
s
u
c
h
a
w
a
y
t
h
at
it
s
h
o
u
ld
co
v
er
all
le
af
n
o
d
es
a
s
s
o
ciate
d
w
it
h
u
s
er
s
in
a
G
.
()
a
K
E
Y
G
r
ep
r
esen
ts
a
s
et
o
f
K
E
Ys
o
f
r
o
o
t
n
o
d
es
o
f
s
u
b
tr
ee
s
of
a
G
.
I
n
F
ig
u
r
e
3
,
if
1
3
4
{
,
,
}
a
G
u
u
u
th
e
n
4
3
(
)
,
a
K
E
Y
G
K
E
Y
K
E
Y
.
I
t
is
b
ec
au
s
e
r
o
o
t
n
o
d
es
34
,
()
vv
co
v
er
all
th
e
m
e
m
b
er
s
of
a
G
.
A
ll
t
h
e
u
s
er
s
i
n
a
G
ar
e
co
v
er
ed
b
y
th
i
s
s
et
.
No
u
s
e
r
ex
ce
p
t
a
uG
ca
n
n
o
t
k
n
o
w
ab
o
u
t a
n
y
K
E
Y
in
()
a
K
E
Y
G
.
3.
Der
iv
e
3
()
{
(
)
}
a
k
K
E
Y
G
ai
k
C
E
G
k
o
w
n
er
s
h
ip
g
r
o
u
p
k
e
y
ar
e
en
cr
y
p
ted
b
y
th
i
s
al
g
o
r
ith
m
b
ef
o
r
e
d
is
tr
ib
u
ti
n
g
to
v
alid
o
w
n
er
s
.
W
h
en
a
u
s
er
j
u
r
eq
u
ests
th
e
d
ata
th
en
q
u
er
y
f
o
r
jj
T
I
D
is
r
ec
eiv
ed
b
y
t
h
e
C
S
S.
C
SS
v
alid
ate
s
j
L
an
d
th
e
n
'
j
j
i
TC
is
s
e
n
t to
th
e
u
s
er
o
t
h
er
w
is
e
r
eq
u
e
s
t
d
ec
lin
ed
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
2
5
2
-
8776
I
n
t J
I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
,
Vo
l.
8
,
No
.
2,
A
u
g
u
s
t
201
9
:
77
–
86
82
Da
ta
Dec
r
yp
tio
n
:
I
f
aa
uG
,
th
e
n
th
e
m
o
d
u
le
'
(
,
,
)
aa
a
i
C
K
P
k
D
e
c
is
r
u
n
to
d
ec
r
y
p
t
th
e
cip
h
er
tex
t
a
i
C
w
h
ic
h
is
r
ec
eiv
ed
b
y
t
h
e
u
s
er
a
u
f
r
o
m
th
e
C
SS
.
Her
e
o
w
n
er
s
h
ip
g
r
o
u
p
k
e
y
d
ec
r
y
p
tio
n
is
al
s
o
p
er
f
o
r
m
ed
b
y
p
ar
s
in
g
a
i
C
in
to
1
2
3
,
,
,
a
a
a
a
i
i
i
T
C
C
C
.
T
h
e
o
w
n
er
s
h
ip
g
r
o
u
p
k
e
y
i
s
e
x
tr
ac
ted
by
3
(
(
)
)
()
K
E
Y
K
E
Y
G
P
k
aa
aa
i
G
k
D
C
.
On
l
y
t
h
e
v
alid
o
w
n
er
ca
n
d
ec
r
y
p
t t
h
e
o
w
n
er
s
h
ip
g
r
o
u
p
k
e
y
a
Gk
b
y
f
o
r
m
u
la
()
aa
K
E
Y
K
E
Y
G
P
k
.
I
f
th
e
u
s
er
a
u
is
n
o
t
a
m
e
m
b
er
o
f
a
G
th
en
,
h
e
ca
n
n
o
t
d
ec
r
y
p
t
a
Gk
.
W
h
en
a
Gk
is
r
etr
iev
ed
,
th
e
cip
h
er
tex
t
is
d
ec
r
y
p
ted
in
to
a
m
ess
a
g
e
u
s
i
n
g
f
o
r
m
u
la.
1
'
()
a
G
k
a
a
ii
DC
C
,
2
i
i
a
i
L
C
K
,
1
()
a
a
L
i
M
D
C
,
1
()
i
a
T
H
M
An
y
m
o
d
i
f
icatio
n
m
ad
e
b
y
p
o
is
o
n
attac
k
is
d
etec
ted
b
y
v
al
i
d
atin
g
ta
g
.
I
f
1
aa
TT
,
th
en
it
m
ea
n
s
tag
in
co
n
s
is
te
n
c
y
is
p
r
ese
n
t
s
o
d
r
o
p
th
e
m
e
s
s
a
g
e
o
th
er
w
i
s
e
a
M
is
th
e
o
r
ig
i
n
al
d
ata
o
u
ts
o
u
r
ce
d
b
y
h
i
m
,
a
n
d
it
i
s
ac
ce
p
ted
.
I
t
is
to
b
e
n
o
ted
th
at
if
a
v
alid
o
w
n
er
r
eq
u
ests
th
e
clo
u
d
s
er
v
er
to
d
elete
an
d
m
o
d
if
y
h
i
s
d
ata
in
C
S,
th
en
h
is
o
w
n
er
s
h
ip
m
u
s
t
b
e
ca
n
ce
led
o
u
t
f
r
o
m
th
e
o
w
n
er
s
h
ip
lis
t
an
d
r
estrict
h
i
m
to
ac
ce
s
s
th
e
d
ata.
B
y
th
is
s
tep
,
f
o
r
w
ar
d
s
ec
r
ec
y
is
m
a
i
n
tain
ed
.
W
h
e
n
t
h
e
s
u
b
s
eq
u
en
t
u
s
er
u
p
lo
ad
s
th
e
s
a
m
e
d
ata.
I
t
is
r
e
-
en
cr
y
p
ted
to
o
f
f
er
b
ac
k
w
ar
d
s
ec
r
ec
y
.
B
y
th
i
s
,
s
u
b
s
eq
u
e
n
t
u
s
er
s
ar
e
p
r
ev
en
ted
f
r
o
m
ac
ce
s
s
in
g
p
r
ev
io
u
s
l
y
e
n
cr
y
p
ted
d
ata.
T
h
e
w
o
r
k
i
n
g
p
r
o
ce
d
u
r
e
o
f
th
e
p
r
o
p
o
s
ed
s
ec
u
r
e
s
ch
e
m
e
s
h
o
w
n
in
Fig
u
r
e
4
.
Fig
u
r
e
4
.
T
h
e
w
o
r
k
in
g
p
r
o
ce
d
u
r
e
o
f
th
e
p
r
o
p
o
s
ed
s
ec
u
r
e
s
ch
e
m
e
R
e
qu
e
s
t
∥
1
′
=
′
3
=
∈
′
=
1
∥
2
∥
3
′
,
,
∥
′
in
to
,
1
′
,
2
,
3
=
∈
∩
3
C
h
oos
e
a
r
a
n
do
m
ow
n
e
r
s
hi
p
g
r
o
up
ke
y
1
⟵
1
′
⟵
2
⊕
⟵
1
1
⟵
I
f
1
≠
T
a
g
I
n
c
o
n
s
i
s
te
n
c
y
Di
s
c
a
r
d
A
c
c
e
pt
Us
e
r
,
1
℘
0
,
1
⟵
⟵
′
⟵
′
⟵
⊕
⟵
1
∥
2
∥
∥
∥
I
n
s
e
r
t
int
o
=
C
on
s
t
r
u
c
t
B
inar
y
KE
Y
T
r
e
e
=
,
I
f
a
lr
e
a
d
y
exi
s
t
S
t
or
e
C
l
o
ud
S
e
r
v
e
r
C
l
o
ud
S
tor
a
g
e
Di
s
ca
r
d
R
e
tr
i
e
v
e
Ye
s
No
No
Ye
s
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J
I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
I
SS
N:
2252
-
8776
A
s
ec
u
r
e
d
ed
u
p
lica
tio
n
s
ch
em
e
fo
r
en
cryp
ted
d
a
t
a
(
V
is
h
a
l P
a
s
s
r
ich
a
)
83
6.
SCH
E
M
E
ANALY
SI
S
T
h
is
s
ec
tio
n
p
r
ese
n
t
s
th
e
co
m
p
ar
is
o
n
s
o
f
th
e
p
r
o
p
o
s
ed
s
ch
e
m
e
w
it
h
ea
r
lier
d
ed
u
p
licatio
n
s
ch
e
m
es.
T
ab
le
1
co
m
p
ar
es
th
e
p
r
o
p
o
s
ed
s
ch
e
m
e
w
i
th
C
E
[
5
]
,
w
ea
k
-
lea
k
ag
e
r
esil
ien
t
d
ed
u
p
licatio
n
[
1
8
]
,
r
an
d
o
m
ized
C
E
[
1
9
]
o
v
er
en
cr
y
p
ted
d
ata.
T
h
ese
all
s
ch
e
m
e
g
u
ar
an
tee
t
h
e
d
ata
p
r
iv
ac
y
i
n
C
SS
b
y
a
llo
w
i
n
g
t
h
e
d
ata
o
w
n
er
to
en
cr
y
p
t th
eir
d
ata.
B
u
t th
e
s
e
all
s
ch
e
m
es d
o
n
o
t
m
a
n
a
g
e
d
y
n
a
m
ic
o
w
n
er
s
h
ip
m
a
n
a
g
e
m
e
n
t
.
T
ab
le
1
.
T
h
e
C
o
m
p
ar
is
o
n
o
f
t
h
e
P
r
o
p
o
s
ed
Sch
em
e
i
n
T
er
m
s
Of
E
n
cr
y
p
ted
Ded
u
p
lica
tio
n
,
T
ag
C
o
n
s
is
ten
c
y
,
an
d
D
y
n
a
m
ic
O
w
n
er
s
h
ip
Ma
n
ag
e
m
e
n
t
S
c
h
e
me
En
c
r
y
p
t
e
d
D
e
d
u
p
l
i
c
a
t
i
o
n
T
a
g
C
o
n
si
s
t
e
n
c
y
Dy
n
a
mi
c
O
w
n
e
r
sh
i
p
M
a
n
a
g
e
me
n
t
C
E
[
5
]
Y
ES
NO
NO
W
L
R
[
1
8
]
Y
ES
Y
ES
NO
R
C
E
[
1
9
]
Y
ES
Y
ES
NO
P
r
o
p
o
se
d
Y
ES
Y
ES
Y
ES
T
h
e
n
o
tatio
n
s
u
s
ed
ar
e
as f
o
llo
w
s
:
S
c
: Size
o
f
ac
ce
p
ted
d
ata
S
k
: Size
o
f
a
k
e
y
S
T
: Size
o
f
a
ta
g
S
ID
: Size
o
f
a
n
id
en
ti
t
y
o
f
a
u
s
er
S
r
: Size
o
f
a
n
o
d
e
v
al
u
e
i
n
Me
r
k
le
h
as
h
tr
ee
S
PoW
: Size
o
f
e
x
c
h
an
g
e
m
ess
a
g
e
f
o
r
P
o
S
T
h
e
‘
k
e
y
s
ize
’
an
d
‘
ta
g
s
ize’
a
r
e
u
s
ed
to
ca
lcu
late
th
e
s
to
r
ag
e
o
v
er
h
ea
d
.
T
h
ey
ar
e
th
e
s
ize
o
f
k
e
y
s
an
d
tag
in
f
o
r
m
atio
n
w
h
ic
h
ar
e
s
to
r
ed
b
y
ea
ch
o
w
n
er
r
esp
ec
tiv
e
l
y
.
T
ab
le
2
s
h
o
w
s
th
e
co
m
p
ar
is
o
n
s
o
f
all
th
ese
tech
n
iq
u
es
i
n
ter
m
s
o
f
s
to
r
ag
e
o
v
er
h
ea
d
T
ab
le
2
.
T
h
e
C
o
m
p
ar
is
o
n
o
f
t
h
e
P
r
o
p
o
s
ed
Sch
em
e
i
n
T
er
m
s
o
f
Sto
r
ag
e
Ov
er
h
ea
d
S
c
h
e
me
S
t
o
r
a
g
e
O
v
e
r
h
e
a
d
K
e
y
si
z
e
T
a
g
S
i
z
e
C
E
[
5
]
S
k
S
t
W
L
R
[
1
8
]
2S
k
+S
M
*S
t
S
t
R
C
E
[
1
9
]
S
k
S
t
P
r
o
p
o
se
d
S
c
h
e
me
lo
g
+
1
S
t
T
ab
le
3
s
h
o
w
s
t
h
e
co
m
p
ar
is
o
n
s
o
f
all
th
ese
tech
n
iq
u
e
s
in
ter
m
s
o
f
co
m
m
u
n
icatio
n
o
v
er
h
ea
d
.
T
h
e
co
m
m
u
n
icatio
n
co
s
t o
f
th
e
p
r
o
p
o
s
ed
s
ch
e
m
e
i
s
ev
al
u
ated
b
y
n
et
w
o
r
k
s
i
m
u
latio
n
.
T
ab
le
3
.
T
h
e
C
o
m
p
ar
is
o
n
o
f
t
h
e
P
r
o
p
o
s
ed
Sch
em
e
i
n
T
er
m
s
o
f
C
o
m
m
u
n
ica
tio
n
O
v
er
h
ea
d
S
c
h
e
me
C
o
mm
u
n
i
c
a
t
i
o
n
O
v
e
r
h
e
a
d
U
p
l
o
a
d
M
e
ssag
e
S
i
z
e
D
o
w
n
l
o
a
d
M
e
ssag
e
S
i
z
e
C
E
[
5
]
S
c
+ S
r
+
S
ID
S
c
W
L
R
[
1
8
]
S
c
+
3
S
k
+
S
r
+ S
ID
S
c
+ S
po
w
+ S
k
+ S
T
R
C
E
[
1
9
]
S
c
+ S
k
+ S
r
+ S
ID
S
c
+ S
k
+ S
T
P
r
o
p
o
se
d
S
c
h
e
me
S
c
+ S
k
+ S
t
+
S
ID
S
c
+ S
k
+ S
T
Fig
u
r
e
5
s
h
o
w
s
t
h
e
e
n
cr
y
p
tio
n
an
d
d
ec
r
y
p
tio
n
ti
m
e
f
o
r
p
r
o
p
o
s
ed
s
ch
e
m
e
w
.
r
.
t.
d
ata
s
ize
.
Fig
u
r
e
6
s
h
o
w
s
t
h
e
e
n
cr
y
p
tio
n
ti
m
e
o
f
t
h
e
p
r
o
p
o
s
ed
s
ch
e
m
e
f
o
r
lar
g
e
s
ize
d
ata
ch
u
n
k
s
f
o
r
d
if
f
er
e
n
t
a
ttrib
u
tes
a
n
d
F
ig
u
r
e
7
s
h
o
w
s
t
h
e
d
ec
r
y
p
tio
n
ti
m
e
o
f
th
e
p
r
o
p
o
s
ed
s
ch
e
m
e
f
o
r
lar
g
e
s
ize
d
ata
ch
u
n
k
s
f
o
r
d
if
f
er
e
n
t a
ttrib
u
tes.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
2
5
2
-
8776
I
n
t J
I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
,
Vo
l.
8
,
No
.
2,
A
u
g
u
s
t
201
9
:
77
–
86
84
Fig
u
r
e
5
.
E
n
cr
y
p
tio
n
a
n
d
d
ec
r
y
p
t
io
n
ti
m
e
w
.
r
.
t.
s
ize
o
f
d
ata
f
o
r
th
e
p
r
o
p
o
s
ed
s
ch
em
e
Fig
u
r
e
6
.
E
n
cr
y
p
tio
n
p
r
o
ce
s
s
(
d
ata
s
ize
vs
ti
m
e)
Fig
u
r
e
7
.
Dec
r
y
p
tio
n
ti
m
e
(
d
ata
s
ize
vs
ti
m
e
)
6
.
1
.
Securit
y
T
h
e
p
r
o
p
o
s
ed
s
ch
e
m
e
is
p
r
o
v
e
d
m
o
r
e
s
ec
u
r
e
in
ter
m
s
o
f
d
ata
co
n
f
id
e
n
tialit
y
,
co
llu
s
io
n
r
e
s
is
tan
ce
,
an
d
b
ac
k
w
ar
d
&
f
o
r
w
ar
d
s
ec
r
ec
y
.
Da
ta
C
o
n
fid
en
tia
lity:
I
n
th
e
p
r
o
p
o
s
ed
s
ch
e
m
e,
th
e
C
S
S
is
n
o
t
f
u
ll
y
tr
u
s
ted
ev
en
i
f
h
o
n
e
s
t.
So
th
er
e
is
a
n
ee
d
to
k
ee
p
p
lai
n
d
ata
s
ec
r
et
f
r
o
m
th
e
C
S
S
a
n
d
u
n
au
th
o
r
i
ze
d
u
s
er
s
.
W
it
h
o
u
t
lo
s
s
o
f
g
e
n
er
alit
y
,
a
m
alicio
u
s
u
s
er
m
a
y
r
eq
u
e
s
t
f
o
r
d
ata
i
M
w
it
h
a
tag
i
T
an
d
a
v
alid
u
s
er
’
s
id
en
ti
t
y
ti
I
D
G
.
He
g
ets
th
e
cip
h
er
tex
t
1
'
2
3
i
i
i
i
T
C
C
C
.
I
f
a
m
alicio
u
s
u
s
er
is
n
o
t
t
h
e
o
w
n
er
o
f
d
ata
i
M
th
en
it
is
i
m
p
o
s
s
ib
le
f
o
r
h
i
m
to
r
etr
iev
e
i
K
an
d
th
e
d
ata
en
cr
y
p
tio
n
k
e
y
L
b
ec
au
s
e
o
f
th
e
cr
y
p
to
g
r
ap
h
ic
h
as
h
f
u
n
ct
io
n
.
T
h
er
ef
o
r
e,
th
e
p
r
o
p
o
s
ed
s
ch
e
m
e
g
u
ar
a
n
tees d
ata
co
n
f
id
en
tialit
y
ag
ain
s
t u
n
a
u
t
h
o
r
ized
u
s
er
s
.
C
o
llu
s
io
n
R
esis
ta
n
ce
:
T
h
e
u
n
a
u
th
o
r
ized
u
s
er
s
w
ith
o
u
t
v
al
id
o
w
n
er
s
h
ip
s
h
o
u
ld
b
e
r
estricte
d
t
o
d
ec
r
y
p
t
d
ata
ev
en
if
t
h
e
y
co
ll
u
d
e
.
I
n
th
is
m
o
d
el,
th
e
d
ata
en
cr
y
p
tio
n
k
e
y
L
an
d
o
w
n
er
s
h
ip
g
r
o
u
p
k
e
y
K
G
ar
e
n
ec
ess
ar
y
to
d
ec
r
y
p
t
cip
h
er
tex
t
in
to
p
lain
d
ata.
L
u
ck
il
y
,
a
m
alicio
u
s
us
er
m
a
y
g
et
th
e
en
cr
y
p
ted
k
e
y
L
b
u
t
K
G
,
th
e
o
w
n
er
s
h
ip
g
r
o
u
p
is
n
o
t p
o
s
s
ib
l
e
to
g
et.
Hen
ce
,
th
e
p
r
o
p
o
s
ed
s
ch
e
m
e
o
f
f
er
s
p
r
o
p
er
s
ec
u
r
it
y
ag
ain
s
t c
o
ll
u
s
io
n
.
B
a
ck
w
a
r
d
a
n
d
F
o
r
w
a
r
d
S
ec
u
r
ity:
I
f
a
u
s
er
tr
ies
to
u
p
lo
ad
alr
ea
d
y
u
n
lo
ad
ed
d
ata
in
C
S,
t
h
e
o
w
n
er
s
h
ip
0
5
10
15
20
25
30
35
40
1
2
4
6
8
10
T
i
m
e
(
m
s)
S
i
z
e
o
f
D
a
t
a
(
M
B
)
En
c
r
y
p
t
i
o
n
D
e
c
r
y
p
t
i
o
n
0
1
2
3
4
5
6
7
8
9
10
64
1
2
8
2
5
6
5
1
2
1
0
2
4
Ex
e
c
u
t
i
o
n
T
i
me
(
S
e
c
o
n
d
s)
D
a
t
a
S
i
z
e
(
M
B
)
4
0
a
t
t
r
8
0
a
t
t
r
1
2
0
a
t
t
r
0
5
10
15
20
25
30
35
64
1
2
8
2
5
6
5
1
2
1
0
2
4
Ex
e
c
u
ti
o
n
T
im
e
(S
e
c
o
n
d
s)
Da
ta S
ize
(M
B)
4
0
a
tt
r
8
0
a
tt
r
1
2
0
a
t
tr
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J
I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
I
SS
N:
2252
-
8776
A
s
ec
u
r
e
d
ed
u
p
lica
tio
n
s
ch
em
e
fo
r
en
cryp
ted
d
a
t
a
(
V
is
h
a
l P
a
s
s
r
ich
a
)
85
g
r
o
u
p
k
e
y
i
s
u
p
d
ated
r
an
d
o
m
l
y
f
o
r
K
G
to
'
K
G
.
'
K
G
is
s
en
t
co
n
f
id
e
n
ti
all
y
an
d
r
ap
id
l
y
to
th
e
d
ata’
s
o
w
n
er
.
1
1
'
()
Gk
EC
C
is
e
n
cr
y
p
ted
w
it
h
K
G
an
d
in
p
ar
allel
'
C
is
r
e
-
e
n
cr
y
p
ted
w
it
h
t
h
e
u
p
d
ated
o
w
n
er
s
h
ip
g
r
o
u
p
k
e
y
'
K
G
b
y
C
S
S.
Hen
ce
,
t
h
e
u
s
er
ca
n
n
o
t
d
ec
r
y
p
t
th
e
p
r
ev
io
u
s
cip
h
er
tex
t.
B
y
t
h
is
,
t
h
e
p
r
o
p
o
s
ed
alg
o
r
ith
m
o
f
f
er
s
b
ac
k
w
ar
d
an
d
f
o
r
w
ar
d
s
ec
r
ec
y
.
7.
CO
NCLU
SI
O
N
Ded
u
p
licatio
n
is
a
n
ef
f
icie
n
t t
ec
h
n
iq
u
e
th
at
i
s
s
u
cc
e
s
s
f
u
ll
y
e
m
p
lo
y
ed
in
v
ar
io
u
s
lar
g
e
s
ca
le
an
d
clo
u
d
s
to
r
ag
e.
R
ec
en
tl
y
,
t
h
e
co
n
f
lict
s
th
at
ar
is
e
w
h
en
d
ed
u
p
licatio
n
is
ap
p
lied
on
en
cr
y
p
ted
d
ata
h
as
b
ee
n
r
eso
lv
ed
.
Ho
w
e
v
er
,
th
e
o
w
n
er
s
h
ip
of
o
u
ts
o
u
r
ce
d
d
ata
is
s
till
an
i
s
s
u
e
.
Dy
n
a
m
ic
o
w
n
er
s
h
ip
m
an
a
g
e
m
en
t
is
also
a
v
er
y
ch
alle
n
g
i
n
g
i
s
s
u
e.
I
n
t
h
i
s
p
ap
er
,
a
s
ec
u
r
e
d
ed
u
p
licatio
n
s
c
h
e
m
e
f
o
r
en
cr
y
p
ted
d
ata
h
as
b
ee
n
p
r
o
p
o
s
ed
.
T
h
e
r
e
-
en
cr
y
p
t
io
n
tech
n
iq
u
es p
r
o
v
id
e
p
o
w
er
to
m
a
n
a
g
e
a
n
y
o
w
n
er
s
h
ip
ch
a
n
g
es i
n
C
S
S.
A
s
t
h
e
o
w
n
er
s
h
ip
ch
a
n
g
es i
n
th
e
o
w
n
er
s
h
ip
g
r
o
u
p
o
f
o
u
t
s
o
u
r
ce
d
d
ata,
r
a
p
id
ly
t
h
e
d
ata
ar
e
r
e
-
en
cr
y
p
ted
u
s
i
n
g
o
w
n
er
s
h
ip
g
r
o
u
p
k
e
y
,
an
d
t
h
is
k
e
y
i
s
also
u
p
d
ated
am
o
n
g
v
al
id
o
w
n
er
s
.
B
y
t
h
i
s
,
d
ata
co
n
f
i
d
en
tialit
y
in
C
S
i
s
s
tr
e
n
g
th
e
n
e
d
.
T
ag
co
n
s
is
te
n
c
y
is
also
u
s
ed
to
tak
e
ad
v
an
ta
g
e
s
o
f
ef
f
icie
n
t
d
ata
d
ed
u
p
licati
o
n
o
v
er
en
cr
y
p
ted
d
ata.
T
h
e
p
r
o
p
o
s
ed
s
ch
e
m
e
i
s
m
o
r
e
e
f
f
ec
ti
v
e
t
h
a
n
ea
r
lier
s
c
h
e
m
e
s
i
n
ter
m
s
o
f
co
m
m
u
n
ic
atio
n
co
s
t.
T
h
er
ef
o
r
e,
th
e
p
r
o
p
o
s
ed
s
ch
e
m
e
o
f
f
er
s
s
ec
u
r
e
an
d
e
f
f
ic
ien
t d
ata
d
ed
u
p
licatio
n
in
clo
u
d
s
to
r
ag
e.
RE
F
E
R
E
NC
E
S
[1
]
Re
in
se
l
D,
Ga
n
tz
J,
R
y
d
n
in
g
J.
“
Da
ta
A
g
e
2
0
2
5
:
T
h
e
Evo
l
u
ti
o
n
o
f
Da
t
a
to
L
i
fe
-
Criti
c
a
l
”
.
A
n
IDC
W
h
it
e
P
a
p
e
r.
S
e
a
g
a
te,
No
v
e
m
b
e
r
2
0
1
8
.
[2
]
M
ich
a
e
l
A
r
m
b
ru
st,
A
r
m
a
n
d
o
F
o
x
,
Re
a
n
G
ri
ff
it
h
,
A
n
th
o
n
y
D.
Jo
se
p
h
,
Ra
n
d
y
Ka
tz,
A
n
d
y
Ko
n
w
in
sk
i,
G
u
n
h
o
L
e
e
,
Da
v
id
P
a
tt
e
rs
o
n
,
A
riel
Ra
b
k
in
,
I
o
n
S
t
o
ica
,
a
n
d
M
a
tei
Zah
a
ria.
“
A
v
ie
w
o
f
c
lo
u
d
c
o
m
p
u
ti
n
g
.
”
C
o
mm
u
n
.
ACM
,
v
o
l.
53,
no
4
(A
p
ril
2
0
1
0
)
,
p
p
.
50
-
58
.
[3
]
Bo
lo
sk
y
WJ,
Do
u
c
e
u
r
JR,
El
y
D,
T
h
e
im
e
r
M
.
“
F
e
a
sib
il
it
y
o
f
a
s
e
rv
e
rles
s
d
istri
b
u
ted
f
il
e
sy
ste
m
d
e
p
lo
y
e
d
o
n
a
n
e
x
isti
n
g
se
t
o
f
d
e
sk
to
p
.
”
ACM
S
I
GM
ET
RICS
Per
f
o
rm
a
n
c
e
Eva
lu
a
ti
o
n
Rev
iew
.
Vo
l.
2
8
,
n
o
.
1
(
2
0
0
0
)
,
p
p
.
34
-
43.
[4
]
Cle
m
e
n
ts
AT
,
A
h
m
a
d
I,
V
il
a
y
a
n
n
u
r
M
,
L
i
J,
e
d
it
o
rs.
“
De
c
e
n
tra
li
ze
d
De
d
u
p
li
c
a
t
io
n
i
n
S
AN
Clu
ste
r
Fi
le
S
y
ste
ms
.
”
USE
NIX
a
n
n
u
a
l
tec
h
n
ica
l
c
o
n
f
e
re
n
c
e
;
2
0
0
9
;
S
a
n
Die
g
o
.
[5
]
Do
u
c
e
u
r
JR,
A
d
y
a
A
,
Bo
lo
sk
y
W
J,
S
im
o
n
P
,
T
h
e
ime
r
M
.
“
Rec
la
imin
g
sp
a
c
e
fro
m
d
u
p
l
ica
te
f
il
e
s
in
a
se
rv
e
rle
ss
d
istrib
u
ted
f
il
e
s
y
ste
m.
”
2
2
n
d
In
te
rn
a
ti
o
n
a
l
Co
n
f
e
re
n
c
e
o
n
Distrib
u
t
e
d
Co
m
p
u
ti
n
g
S
y
ste
m
s; 2
0
0
2
;
V
i
e
n
n
a
,
A
u
stria.
[6
]
Dro
p
b
o
x
.
w
ww
.
d
ro
p
b
o
x
.
c
o
m
.
2
0
1
4
.
[7
]
G
o
o
g
le Driv
e
.
h
tt
p
s://
d
riv
e
.
g
o
o
g
l
e
.
c
o
m
.
2
0
1
6
.
[8
]
IDRIV
E.
h
tt
p
s://
w
ww
.
id
riv
e
.
c
o
m
.
2
0
1
7
.
[9
]
S
to
re
r
M
W
,
G
re
e
n
a
n
K,
L
o
n
g
DD
,
M
il
ler
EL
,
e
d
it
o
rs.
“
S
e
c
u
re
d
a
t
a
d
e
d
u
p
li
c
a
t
io
n
.
”
4
t
h
A
CM
in
ter
n
a
t
io
n
a
l
w
o
rk
sh
o
p
o
n
S
to
ra
g
e
se
c
u
rit
y
a
n
d
su
rv
iv
a
b
il
it
y
;
2
0
0
8
;
A
lex
a
n
d
ria,
USA
.
[1
0
]
Be
ll
a
re
,
M
ih
ir
&
Ke
e
lv
e
e
d
h
i,
S
riram
&
Risten
p
a
rt,
T
h
o
m
a
s.
(2
0
1
3
).
“
Du
p
L
ES
S
:
S
e
rv
e
r
-
a
id
e
d
e
n
c
ry
p
ti
o
n
fo
r
d
e
d
u
p
li
c
a
te
d
sto
r
a
g
e
.
”
2
2
n
d
USE
NIX
Co
n
f
e
re
n
c
e
o
n
S
e
c
u
rit
y
.
1
7
9
-
1
9
4
.
[1
1
]
M
u
laz
z
a
n
i
M
,
S
c
h
rit
tw
ies
e
r
S
,
Leith
n
e
r
M
,
H
u
b
e
r
M
,
W
e
ip
p
l
ER
,
e
d
it
o
rs.
“
Da
rk
Clo
u
d
s
o
n
t
h
e
Ho
rizo
n
:
Us
i
n
g
Clo
u
d
S
to
ra
g
e
a
s
At
ta
c
k
Vec
to
r
a
n
d
O
n
li
n
e
S
l
a
c
k
S
p
a
c
e
.
”
USE
NI
X
se
c
u
rit
y
s
y
m
p
o
siu
m
;
2
0
1
1
;
S
a
n
F
ra
n
c
isc
o
,
CA
.
[1
2
]
J.
Yu
a
n
a
n
d
S
.
Yu
,
"
S
e
c
u
re
a
n
d
c
o
n
sta
n
t
c
o
st
p
u
b
li
c
c
lo
u
d
st
o
ra
g
e
a
u
d
it
in
g
w
it
h
d
e
d
u
p
li
c
a
ti
o
n
,
"
2
0
1
3
IEE
E
Co
n
fer
e
n
c
e
o
n
Co
mm
u
n
ica
t
io
n
s a
n
d
Ne
tw
o
rk
S
e
c
u
rity (
CNS
)
,
Na
ti
o
n
a
l
Ha
rb
o
r,
M
D,
2
0
1
3
,
p
p
.
1
4
5
-
1
5
3
.
[1
3
]
S
h
in
,
Yo
u
n
g
j
o
o
&
K
o
o
,
Do
n
g
y
o
u
n
g
&
Hu
r,
J
u
n
b
e
o
m
.
“
A
S
u
rv
e
y
o
f
S
e
c
u
re
Da
ta
De
d
u
p
li
c
a
ti
o
n
S
c
h
e
m
e
s
f
o
r
Clo
u
d
S
to
ra
g
e
S
y
ste
m
s.
”
ACM
Co
mp
u
ti
n
g
S
u
rv
e
y
s
.
v
o
l.
4
9
,
n
o
.
7
4
.
p
p
.
1
-
38
.
Ja
n
u
a
ry
2
0
1
7
.
[1
4
]
V
.
Ja
v
a
ra
iah
,
"
Ba
c
k
u
p
f
o
r
c
lo
u
d
a
n
d
d
isa
ste
r
re
c
o
v
e
r
y
f
o
r
c
o
n
su
m
e
rs
a
n
d
S
M
Bs
,"
2
0
1
1
F
if
th
I
E
EE
In
ter
n
a
ti
o
n
a
l
Co
n
fer
e
n
c
e
o
n
Ad
v
a
n
c
e
d
T
e
lec
o
mm
u
n
ica
ti
o
n
S
y
ste
ms
a
n
d
Ne
two
r
k
s (
ANT
S
)
,
Ba
n
g
a
lo
re
,
2
0
1
1
,
p
p
.
1
-
3
.
[1
5
]
Y.
T
a
n
,
H.
Jia
n
g
,
D.
F
e
n
g
,
L
.
T
ian
,
Z.
Ya
n
a
n
d
G
.
Zh
o
u
,
"
S
AM:
A
S
e
m
a
n
ti
c
-
Aw
a
re
M
u
lt
i
-
ti
e
re
d
S
o
u
rc
e
De
-
d
u
p
li
c
a
ti
o
n
F
ra
m
e
w
o
rk
f
o
r
Clo
u
d
Ba
c
k
u
p
,
"
2
0
1
0
3
9
t
h
I
n
ter
n
a
ti
o
n
a
l
Co
n
fer
e
n
c
e
o
n
P
a
ra
ll
e
l
Pro
c
e
ss
in
g
,
S
a
n
Die
g
o
,
CA
,
2
0
1
0
,
p
p
.
6
1
4
-
6
2
3
.
[1
6
]
.
D.
Ha
rn
ik
,
B.
P
i
n
k
a
s
a
n
d
A
.
S
h
u
lm
a
n
-
P
e
leg
,
"
S
id
e
Ch
a
n
n
e
ls
i
n
C
lo
u
d
S
e
rv
ice
s:
De
d
u
p
li
c
a
ti
o
n
i
n
Clo
u
d
S
to
ra
g
e
,
"
in
IEE
E
S
e
c
u
rity &
Priva
c
y
,
v
o
l.
8
,
n
o
.
6
,
p
p
.
4
0
-
4
7
,
N
o
v
.
-
De
c
.
2
0
1
0
.
[1
7
]
Ha
lev
i,
S
h
a
i
&
Ha
rn
ik
,
Da
n
n
y
&
P
in
k
a
s,
Be
n
n
y
&
S
h
u
lm
a
n
-
P
e
leg
,
A
le
x
a
n
d
ra
.
“
Pro
o
fs
o
f
o
wn
e
rs
h
ip
i
n
re
mo
te
sto
ra
g
e
sy
ste
ms
”
.
P
r
o
c
e
e
d
in
g
s
o
f
th
e
A
CM
Co
n
f
e
re
n
c
e
o
n
Co
m
p
u
t
e
r
a
n
d
C
o
m
m
u
n
ica
ti
o
n
s
S
e
c
u
rit
y
.
4
9
1
-
5
0
0
.
2
0
1
1
.
[1
8
]
X
u
,
S
u
sa
n
Jia
,
Ee
-
Ch
ie
n
C
h
a
n
g
a
n
d
Jia
n
y
in
g
Zh
o
u
.
“
W
e
a
k
lea
k
a
g
e
-
re
sili
e
n
t
c
li
e
n
t
-
si
d
e
d
e
d
u
p
li
c
a
ti
o
n
o
f
e
n
c
ry
p
ted
d
a
ta i
n
c
l
o
u
d
sto
ra
g
e
.
”
Asia
CC
S
(
2
0
1
3
).
[1
9
]
Be
ll
a
re
M
,
Ke
e
lv
e
e
d
h
i
S
,
Risten
p
a
rt
T
,
e
d
it
o
rs.
“
M
e
ss
a
g
e
-
lo
c
k
e
d
e
n
c
ry
p
ti
o
n
a
n
d
se
c
u
re
d
e
d
u
p
li
c
a
t
io
n
.
”
In
tern
a
ti
o
n
a
l
Co
n
f
e
re
n
c
e
o
n
th
e
T
h
e
o
ry
a
n
d
A
p
p
li
c
a
ti
o
n
s o
f
Cry
p
to
g
ra
p
h
ic T
e
c
h
n
iq
u
e
s; 2
0
1
3
;
A
th
e
n
s,
G
re
e
c
e
.
[2
0
]
A
.
Ru
ss
e
ll
a
n
d
Ho
n
g
W
a
n
g
,
"
H
o
w
to
f
o
o
l
a
n
u
n
b
o
u
n
d
e
d
a
d
v
e
rsa
r
y
w
it
h
a
sh
o
rt
k
e
y
,
"
in
IEE
E
T
ra
n
sa
c
ti
o
n
s
o
n
In
fo
rm
a
t
io
n
T
h
e
o
ry
,
v
o
l.
5
2
,
n
o
.
3
,
p
p
.
1
1
3
0
-
1
1
4
0
,
M
a
rc
h
2
0
0
6
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
2
5
2
-
8776
I
n
t J
I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
,
Vo
l.
8
,
No
.
2,
A
u
g
u
s
t
201
9
:
77
–
86
86
B
I
O
G
RAP
H
I
E
S
O
F
AUTH
O
RS
V
ish
a
l
P
a
ss
rich
a
re
c
e
iv
e
d
h
is
B.
T
e
c
h
.
w
it
h
h
o
n
o
rs
in
C
o
m
p
u
ter
En
g
in
e
e
rin
g
f
ro
m
Ku
ru
k
sh
e
tra
Un
iv
e
rsit
y
,
In
d
ia,
in
2
0
1
0
,
He
re
c
e
iv
e
d
h
is
M
.
T
e
c
h
.
w
it
h
h
o
n
o
rs
i
n
Co
m
p
u
ter
E
n
g
in
e
e
rin
g
f
ro
m
YMCA
US
T
,
F
a
rid
a
b
a
d
In
d
ia
in
2
0
1
2
.
He
is
c
u
rre
n
tl
y
w
o
rk
in
g
a
s
a
n
a
ss
istan
t
p
ro
f
e
ss
o
r
in
th
e
Co
m
p
u
ter
En
g
in
e
e
rin
g
De
p
a
rtm
e
n
t,
Na
ti
o
n
a
l
In
stit
u
te
o
f
T
e
c
h
n
o
lo
g
y
,
Ku
ru
k
sh
e
tra.
He
is
a
lso
p
u
rsu
i
n
g
P
h
.
D.
f
ro
m
th
e
Co
m
p
u
t
e
r
En
g
i
n
e
e
rin
g
De
p
a
rtm
e
n
t,
Na
ti
o
n
a
l
I
n
stit
u
te
o
f
T
e
c
h
n
o
lo
g
y
,
Ku
ru
k
sh
e
tra.
His c
u
rre
n
t
re
se
a
rc
h
f
o
c
u
se
s o
n
Da
ta d
e
d
u
p
li
c
a
ti
o
n
a
n
d
M
a
c
h
i
n
e
L
e
a
rn
in
g
.
A
sh
ish
Ch
o
p
ra
is
c
u
rre
n
tl
y
a
n
A
s
sista
n
t
P
ro
f
e
ss
o
r
a
t
th
e
Na
ti
o
n
a
l
In
stit
u
te
o
f
T
e
c
h
n
o
lo
g
y
,
Ku
ru
k
sh
e
tra,
I
n
d
ia
.
He
h
o
ld
s
h
is
P
h
.
D.
d
e
g
re
e
a
n
d
M
CA
d
e
g
re
e
in
De
p
a
rtm
e
n
t
o
f
Co
m
p
u
ter
A
p
p
li
c
a
ti
o
n
f
ro
m
th
e
NI
T
,
Ku
ru
k
sh
e
tra
in
2
0
1
3
a
n
d
2
0
0
6
re
sp
e
c
ti
v
e
l
y
.
His
P
h
.
D.
re
se
a
rc
h
w
o
rk
m
a
in
ly
f
o
c
u
se
d
o
n
M
o
b
il
e
A
d
h
o
c
Ne
tw
o
rk
s.
His
c
u
rre
n
t
re
se
a
rc
h
f
o
c
u
se
s
o
n
W
irele
ss
S
e
n
so
r
Ne
tw
o
rk
s a
n
d
Da
ta De
d
u
p
l
ica
ti
o
n
.
P
o
o
ja
S
h
a
rm
a
r
e
c
e
i
v
e
d
h
e
r
Ba
c
h
e
lo
r
o
f
S
c
ien
c
e
in
Co
m
p
u
ter
A
p
p
li
c
a
ti
o
n
f
ro
m
Ku
ru
k
sh
e
tra
Un
iv
e
rsit
y
,
Ku
ru
k
sh
e
tra,
In
d
ia
i
n
2
0
0
9
.
S
h
e
re
c
e
iv
e
d
h
e
r
m
a
ste
r
i
n
c
o
m
p
u
ter
a
p
p
li
c
a
ti
o
n
f
ro
m
Ku
ru
k
sh
e
tra
Un
iv
e
rsity
,
Ku
ru
k
sh
e
tra
in
2
0
1
2
.
S
h
e
is
w
o
rk
in
g
a
s
a
lec
tu
re
r
in
G
o
v
e
rn
m
e
n
t
c
o
ll
e
g
e
f
o
r
W
o
m
e
n
,
Ka
rn
a
l
sin
c
e
A
u
g
u
st
2
0
1
3
.
S
h
e
h
a
s
b
e
e
n
g
u
id
e
d
m
a
n
y
u
n
d
e
rg
ra
d
u
a
tes
a
n
d
p
o
stg
ra
d
u
a
tes
p
r
o
jec
t.
S
h
u
b
h
a
n
s
h
i
S
in
g
h
a
l
re
c
e
iv
e
d
h
e
r
B.
T
e
c
h
in
c
o
m
p
u
ter
sc
ien
c
e
a
n
d
e
n
g
in
e
e
rin
g
f
ro
m
u
tt
e
r
p
ra
d
e
sh
tec
h
n
ica
l
u
n
iv
e
rsit
y
,
L
u
c
k
n
o
w
,
In
d
ia.
S
h
e
d
id
h
e
r
M
a
ste
r
in
T
e
c
h
n
o
lo
g
y
in
Co
m
p
u
ter
En
g
in
e
e
rin
g
f
ro
m
Ku
ru
k
sh
e
tra
Un
iv
e
rsit
y
,
K
u
ru
k
sh
e
tra.
P
re
se
n
tl
y
sh
e
is
w
o
r
k
in
g
a
s
As
sista
n
t
P
ro
f
e
ss
o
r
in
Co
m
p
u
ter
S
c
ien
c
e
a
n
d
E
n
g
in
e
e
ri
n
g
De
p
a
rtm
e
n
t,
T
ERi
i,
Ku
ru
k
sh
e
tra.
He
r
a
re
a
o
f
In
tere
st
is
d
a
ta
d
e
d
u
p
li
c
a
ti
o
n
a
n
d
m
a
c
h
in
e
lea
rn
in
g
.
Evaluation Warning : The document was created with Spire.PDF for Python.