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d
s
o
f
in
f
o
r
m
a
tio
n
s
e
c
u
r
it
y
is
s
i
m
ila
r
i
n
th
e
s
e
n
s
e
t
h
a
t i
m
p
le
m
e
n
ta
tio
n
b
e
g
in
w
i
th
s
ecu
r
i
n
g
p
r
o
ces
s
t
o
co
v
er
t
h
e i
m
p
o
r
t
an
t
d
at
a i
n
o
r
d
er
t
o
h
i
d
e t
h
e
h
i
d
d
e
n i
nf
o
r
m
a
t
i
o
n o
r
s
e
c
ur
i
n
g t
he
a
v
a
ila
b
ilit
y
d
a
ta
.
I
n
t
h
e p
r
ev
i
o
u
s
r
es
ear
ch
,
t
h
e s
ecu
r
i
n
g
p
r
o
ces
s
es
ar
e
m
o
s
t
l
y
i
n
t
h
e
f
o
r
m
o
f
e
n
co
d
i
n
g
,
en
cr
y
p
t
i
n
g
a
n
d
e
m
b
ed
d
i
n
g
p
r
o
ces
s
.
A
f
t
er
w
ar
d
s
,
t
h
e l
as
t
i
m
p
l
e
m
en
t
at
i
o
n
m
o
s
t
l
y
i
s
h
o
w
t
o
g
e
n
er
at
e t
h
e
s
e
cu
r
ed
d
at
a b
as
ed
o
n
d
at
a b
ef
o
r
e t
h
e s
ecu
r
i
n
g
p
r
o
ces
s
.
T
h
i
s
i
n
cl
u
d
es
d
eco
d
i
n
g
,
d
ecr
y
p
t
i
n
g
,
an
d
ex
t
r
act
i
n
g
t
h
e s
ecr
et
t
ex
t
o
r
m
e
s
sa
g
e
s.
T
h
e r
em
ai
n
d
er
o
f
t
h
i
s
p
ap
er
i
s
o
r
g
an
i
zed
as
f
o
l
l
o
w
s
.
S
ect
i
o
n
2
p
r
es
en
t
s
t
h
e r
e
v
i
e
w
cat
eg
o
r
y
o
f
t
h
e
da
t
a
h
i
di
ng
s
c
h
e
m
e
s
,
S
e
c
t
i
on
3 pr
e
s
en
t
s
t
h
e t
r
en
d
s
o
f
t
h
e d
at
a h
i
d
i
n
g
i
n
t
er
p
r
et
ed
s
ch
e
m
e
s
,
S
ect
i
o
n
4
p
r
es
en
t
s
t
h
e p
r
ef
er
r
ed
d
at
a h
i
d
i
n
g
s
ch
e
m
es
a
n
d
f
i
n
al
l
y
S
ect
i
o
n
5
d
i
s
cu
s
s
es
t
h
e r
ev
i
e
w
s
a
n
d
co
n
cl
u
d
es
t
h
e p
ap
er
.
2.
RE
VI
E
W
C
AT
E
G
O
RY
T
h
i
s
p
ap
er
r
ev
i
e
w
s
d
i
f
f
er
en
t
t
y
p
es
o
f
d
at
a
h
i
d
i
n
g
s
c
h
e
m
es
t
h
a
t
c
ons
i
s
t
v
i
e
w
s
f
r
o
m
de
c
odi
n
g
,
d
ecr
y
p
t
i
n
g
a
n
d
e
x
t
r
act
i
n
g
p
r
o
ces
s
.
I
n
f
o
r
m
at
i
o
n
d
eco
d
i
n
g
i
s
t
h
e
p
r
o
ces
s
t
o
co
n
v
er
t
a
c
y
p
h
er
ed
t
ex
t
b
ac
k
t
o
p
la
in
-
t
ex
t
w
h
i
l
e d
ecr
y
p
t
i
n
g
i
s
t
ak
i
n
g
an
en
cr
y
p
t
ed
t
ex
t
an
d
co
n
v
er
t
i
n
g
i
t
b
ac
k
i
n
t
o
o
r
i
g
i
n
al
t
ex
t
.
Mean
w
h
i
l
e,
ex
t
r
act
i
ng i
s
t
he
p
r
o
c
e
s
s
o
f
c
o
nve
r
t
i
n
g t
he
c
i
p
he
r
t
e
xt
i
nt
o
t
h
e
p
l
a
i
n t
e
xt
b
y
us
i
n
g a
s
e
c
r
e
t
ke
y
.
T
a
b
l
e
1
s
ho
w
s
t
h
e cl
as
s
i
f
i
cat
i
o
n
o
f
s
c
h
e
m
e
s
b
as
ed
o
n
t
h
e l
i
t
er
at
u
r
e f
r
o
m
t
h
e
l
as
t
d
ecad
e.
T
a
b
le
1
.
C
la
s
s
if
ic
a
tio
n
o
f
S
ch
e
m
es
T
yp
e
S
c
h
e
m
e
s
S
ym
b
o
l
R
e
pr
e
se
nt
a
ti
on
De
c
odi
n
g
S
c
h
e
m
e
s
N
e
u
r
a
l
-
ba
se
d P
o
e
tr
y
Ge
ne
r
a
tio
n
[
4
]
ne
ur
a
l
B
Ar
b
it
r
a
r
y
Algor
i
t
h
m
Enc
r
y
p
ti
on
[
5]
AAE
En
c
odin
g Hidi
n
g
th
e
M
e
ss
a
ge
in
t
o A
n
E
x
c
e
l
G
r
a
ph
[
6]
EXC
ELg
R
J
DA Algor
it
hm
[
7
]
R
J
DA
Alp
h
a
b
e
t
I
nd
e
x
M
a
t
r
ix (
En
glish
&
M
a
la
y
a
la
m
)
[8
]
AL
P
HAi
M
En
c
odin
g of
Hi
ndi
Te
xt
[
9
]
En
Hind
i
T
Vi
su
a
l C
r
y
p
t
ogr
a
ph
y
S
c
h
e
m
e
s
[
10
]
V
Cry
p
S
Hom
om
or
ph
i
c
Enc
r
y
p
ti
on
S
c
h
e
m
e
[
1
1
]
HES
A B
oot
s Tr
a
p
pa
b
le
Enc
r
y
p
ti
on
S
c
h
e
m
e
[
1
2
]
t
r
a
p
EnS
Hu
f
f
m
a
n
C
o
d
in
g Algor
i
thm
[
1
3
]
HC
A
Elli
p
ti
c
C
ur
ve
C
r
y
pt
ogr
a
ph
y
(
Ec
c
)
[
1
4
]
EC
C
DWT Dom
a
in
of
A C
a
r
r
i
e
r
I
m
a
ge
[
1
5
]
DWT
W
a
t
e
r
m
a
r
k
[
1
6
]
W
s
E
nc
a
p
sul
a
tio
n S
c
he
m
e
s
[
17
]
ENC
AP
s
De
c
r
y
p
t
in
g
S
c
h
e
m
e
H
y
br
id S
c
he
m
e
[
1
8
]
–
[
21
]
[
1
8
]
HS
A
dv
a
n
c
e
E
nc
r
y
pt
io
n S
ta
n
da
r
d
(
AES
)
[
2
2
]
–
[
2
5
]
AES
R
iv
e
st
-
S
h
a
mi
r
-
Ad
le
m
a
Algor
i
th
m
(
R
S
A
)
[
11
]
,
[
18
]
,
[
1
9]
,
[
26
]
R
SA
D
a
ta
E
nc
r
y
p
tio
n S
ta
n
da
r
d (
D
E
S
)
[
2
3
]
,
[
2
7
]
DES
L
S
B
[
5]
,
[
12]
,
[
2
8]
L
S
B
Hom
om
or
ph
i
c
Enc
r
y
p
ti
on
S
c
h
e
m
e
[
2
1]
,
[
2
2]
,
[
26]
HES
C
on
ve
n
ti
ona
l En
c
r
y
p
t
i
o
n
Algor
it
hm
s B
l
owf
i
s
h
[
2
3
]
C
EAB
W
B
in
a
r
y
R
S
A E
n
c
r
y
p
ti
on Algor
i
th
m
(
B
R
EA)
[
19
]
BRE
A
S
y
m
m
e
tr
i
c
K
e
y
E
nc
r
y
pt
io
n
[
2
3
]
,
[
2
9
]
,
[
3
0
]
S
KE
R
DH S
c
h
e
m
e
s
[
31]
R
DH
H
u
f
f
m
a
n
Enc
odi
n
g
Algor
i
th
m
[
28
]
HEA
Tr
a
ns
p
o
s
iti
on C
r
y
p
t
ogr
a
ph
y
Algor
i
t
h
m
[
3
2
]
TC
A
A B
oot
s tr
a
p
pa
b
le
En
c
r
y
p
t
i
o
n
S
c
he
m
e
[
1
2
]
BT
RS
EC
C
De
c
r
y
pt
i
o
n
[
1
4
]
EC
C
EC
R
(
E
n
c
r
y
p
ti
on with
C
ove
r
Te
xt
a
nd
R
e
or
de
r
in
g)
[
33
]
EC
R
E
xtr
a
c
ti
ng
S
c
h
e
m
e
s
ST
C (S
y
n
d
ro
me
-
T
r
e
l
l
i
s
C
o
d
e)
S
ch
em
e
[
3
4
]
S
TC
C
om
p
r
e
ssi
on
Algor
ith
m
[
35
]
CA
R
a
n
d
o
m
C
h
a
r
a
c
t
e
r
S
c
h
e
m
e
[
36
]
RC
Hi
de
Te
x
t
-
I
n
-
Te
x
t
M
e
ss
a
ge
s
[
3
7
]
HTTM
W
e
b T
e
x
t E
xt
r
a
c
tio
n
[
3
8
]
WTE
Ex
t
r
a
c
t
The
C
hin
e
se
Te
xt
[
3
8
]
EC
T
Hy
b
r
i
d
Algor
it
hm
[
3
9
]
HA
R
DH S
c
h
e
m
e
[
4
0
]
R
DH
B
lowf
i
s
h
Algor
it
hm
[
4
0
]
B
W
A
B
wt
(
B
ur
r
ows
W
h
e
e
le
r
Tr
a
ns
f
or
m
)
B
W
T
HHK En
c
odin
g (
Hindi
He
x
a
d
e
c
i
m
a
l M
o
d
i
f
i
e
d Ka
ta
pa
y
a
d
i
E
n
c
o
d
in
g)
S
c
h
e
m
e
[
4
1
]
HHK
Ad
va
nc
e
d
Da
t
a
E
n
c
r
y
pt
(
AES
)
[
42
]
AES
D
a
ta
E
nc
r
y
p
tio
n S
ta
n
da
r
d (
D
E
S
)
[
3
6
]
DES
R
iv
e
st
-
S
h
a
mi
r
-
Ad
le
m
a
n Algor
i
th
m
[
4
3
]
R
SA
L
-
R
S
c
h
e
m
es
[
4
4
]
L
-
R
S
i
m
p
le
Te
xt
Em
b
e
dd
in
g
S
c
h
e
m
e
With
R
e
ve
r
sib
i
lit
y
[
43
]
S
TES
R
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SSN
:
25
02
-
4752
I
nd
o
ne
s
i
a
n J
E
l
e
c
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&
C
o
m
p
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c
i
,
V
o
l.
11
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A
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t
2018
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68
–
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B
as
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ab
l
e 1
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t
h
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p
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r
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u
p
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3.
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NDS
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CH
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M
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m
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e r
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3
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e
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o
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Sc
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F
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r
e
2
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s
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u
m
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o
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nt
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l
2017.
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h
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b
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F
i
gur
e
1
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a
t
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t
h
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num
be
r
of
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o
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o
d
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m
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ni
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i
l
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t
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s
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h
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u
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h
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t
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al
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m
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ch
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r
e
s
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a
r
c
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nc
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ng s
c
he
m
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s
b
e
gi
n f
r
o
m
E
N
C
A
P
s
(2
0
0
1
),
W
s
(
20
06)
,
D
W
T
(
2
007)
,
H
C
A
(
2010)
,
E
C
C
(
2010)
,
H
E
S
(
20
11)
,
t
r
a
p
E
n
s
(
2011)
,
V
C
r
y
pS
(
201
2)
,
E
n
H
i
n
di
T
(
201
4)
,
A
L
P
H
A
i
M
(
2015)
,
A
A
E
(
2016)
,
E
X
C
E
L
g
(
2016)
,
R
J
D
A
(
2016)
,
a
nd
f
i
na
l
l
y t
he
l
at
es
t
s
c
h
e
m
e cal
l
ed
ne
ur
a
l
B
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2
0
1
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.
F
i
g
ur
e
1
.
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re
n
d
s
o
f
d
e
c
o
d
i
ng s
c
he
m
e
s
F
u
r
t
h
er
m
o
r
e,
F
i
g
u
r
e 1
d
e
m
o
n
s
t
r
at
e
s
t
h
at
t
h
e r
e
s
ear
ch
o
n
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eco
d
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t
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w
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t
h
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h
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s
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i
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r
e
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ES
[
1]
R
. F
. M
a
n
s
o
u
r
, W
. F
.
A
w
w
a
d
,
a
n
d
A
.
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.
M
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d,
“
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M
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o D
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t
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f
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m
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s
,
”
v
ol
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20
12
,
n
o.
A
pr
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l
,
pp
.
91
–
9
5,
20
12.
[
2]
S
.
D
e
y
a
nd A
.
A
br
a
ha
m
,
“
D
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P
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m
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a
nd N
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l
N
um
be
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s
,
”
pp
.
1
–
45
.
[
3]
H
.
T
u,
“
A
S
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t
y
E
nha
nc
e
d
P
a
s
s
w
or
d
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c
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t
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n a
n
d
U
p
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at
e S
ch
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as
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n
E
l
l
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p
t
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c C
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r
v
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pt
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r
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phy
,
”
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ol
.
12,
n
o.
10,
p
p.
7
35
3
–
7
36
0,
20
14
.
[
4]
Y
.
L
uo a
nd
Y
.
H
ua
ng
,
“
T
e
x
t
S
t
e
g
a
nog
r
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phy
w
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t
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g
h E
m
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R
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,
”
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5t
h A
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I
nf
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H
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di
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M
u
l
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m
ed
.
S
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r
.
-
I
H
MMSe
c
’
1
7
,
p
p
.
9
9
–
10
4,
20
17
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SSN
:
25
02
-
4752
I
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ng
&
C
o
m
p
S
c
i
,
V
o
l.
11
, N
o
.
2
,
A
ug
us
t
2018
:
7
68
–
7
74
774
[
5]
I
.
Az
a
d
,
“
A N
e
w
M
e
t
hod f
or
T
e
x
t
H
i
di
ng
i
n t
he
I
m
a
ge
by
U
s
i
ng
L
S
B
,
”
v
ol
.
7
,
n
o.
4,
pp
.
1
26
–
13
2,
201
6
.
[
6]
F
.
A
k
ht
e
r
,
“
A
S
e
c
ur
e
d W
or
d by
W
or
d G
r
a
ph S
t
e
g
a
nog
r
a
phy
us
i
n
g
H
uf
f
m
a
n E
nc
o
di
ng
,
”
p
p.
9
–
12
,
201
6.
[
7]
O
.
W
.
L
i
a
ng
a
nd V
.
I
r
a
nm
a
ne
s
h,
“
I
nf
or
m
a
t
i
on H
i
di
ng
us
i
ng
W
hi
t
e
s
pa
c
e
T
e
c
hn
i
que
i
n M
i
c
r
os
of
t
W
or
d,
”
2
01
6.
[
8]
P
.
M
.
V
i
dhy
a
a
nd V
.
P
a
ul
,
“
A
m
e
t
hod f
or
t
e
x
t
s
t
e
ganogr
ap
hy
us
i
ng m
al
ay
al
am
t
e
x
t
,
”
P
r
oc
e
di
a
C
o
m
put
.
S
c
i
.
,
v
ol
.
46,
no
.
I
c
i
c
t
2
01
4,
pp
.
5
24
–
53
1,
20
1
5.
[
9]
R
.
S
ha
h
a
nd
Y
.
S
.
C
h
ou
ha
n,
“
E
nc
odi
ng
of
H
i
ndi
T
e
x
t
U
s
i
ng
S
t
e
g
a
n
og
r
a
phy
T
e
c
hn
i
que
,
”
no.
1,
p
p.
2
2
–
28
,
2
01
4.
[
1
0]
K
.
T
s
a
n a
nd L
.
A
ut
hor
,
“
B
a
s
e
d o
n B
i
na
r
y
E
nc
odi
ng
M
e
t
h
ods
a
n
d
V
i
s
ua
l
C
r
y
pt
og
r
a
phy
S
c
he
m
e
s
t
o H
i
de
D
a
t
a
,
”
pp
.
4
–
7,
20
12
.
[
1
1]
M
.
H
ong
,
W
.
Z
ha
o,
a
nd
P
.
W
a
n
g
,
“
H
o
m
o
m
or
phi
c
E
nc
r
y
pt
i
on
S
c
he
m
e
B
a
s
e
d on E
l
l
i
pt
i
c
C
ur
v
e
C
r
y
pt
og
r
a
ph
y
f
or
P
ri
v
a
c
y
P
r
ot
e
c
t
i
o
n
of
C
l
oud
C
om
put
i
ng
,
”
2
01
6.
[
1
2]
Z
.
B
r
a
k
e
r
s
k
i
,
“
E
f
f
i
c
i
e
nt
F
ul
l
y
H
om
o
m
or
phi
c
E
nc
r
y
pt
i
on f
r
om
(
S
t
a
nda
r
d )
L
W
E
,
”
pp.
97
–
10
6,
20
11
.
[
1
3]
K
.
N
e
g
r
a
t
,
R
.
S
m
k
o,
a
nd A
.
A
l
m
a
r
i
m
i
,
“
V
a
r
i
a
bl
e
L
e
ng
t
h E
nc
odi
ng
i
n M
u
l
t
i
p
l
e
F
r
e
que
nc
y
D
om
a
i
n S
t
e
g
a
nog
r
a
phy
,
”
pp.
30
5
–
3
09
,
2
01
0.
[
1
4]
P
.
B
h
,
D
.
C
ha
n
dr
a
v
a
t
hi
,
a
n
d
P
.
P
.
R
oj
a
,
“
E
nc
o
di
ng
A
nd
D
e
c
odi
ng
of
a
M
e
s
s
a
g
e
i
n t
he
I
m
pl
e
m
e
nt
a
t
i
on
of
E
l
l
i
pt
i
c
C
ur
v
e
C
r
y
pt
og
r
a
phy
us
i
ng
K
obl
i
t
z
’
s
M
e
t
ho
d,
”
v
ol
.
2
,
n
o.
5,
pp
.
1
904
–
19
07
,
2
01
0.
[
1
5]
S
.
Y
a
ng
,
“
T
e
x
t
I
nf
or
m
a
t
i
on H
i
di
ng
M
e
t
hod B
a
s
e
d on C
ha
o
t
i
c
M
a
p a
nd B
C
H
C
ode
i
n D
W
T
D
o
m
a
i
n of
A
C
a
r
r
i
e
r
I
m
ag
e,
” p
p
.
2
3
9
–
24
1,
20
07
.
[
1
6]
M
.
A
.
Q
ad
i
r
an
d
I
.
A
h
m
ad
,
“D
i
g
i
t
al
T
ex
t
W
at
er
m
ar
k
i
n
g
:
S
ecu
r
e
C
o
n
t
en
t
D
el
i
v
er
y
an
d
D
at
a
H
i
d
i
n
g
i
n
D
i
g
i
t
al
D
oc
um
e
nt
s
,
”
no.
N
ov
e
m
be
r
,
pp.
18
–
2
1,
20
06
.
[
1
7]
P
. R
. B
e
l
l
a
r
e
, M
i
h
i
r
, “
E
n
c
o
d
e
-
th
en
-
e
nc
i
phe
r
e
nc
r
y
pt
i
on:
H
ow
t
o
e
x
pl
oi
t
no
nc
e
s
or
r
e
du
nda
nc
y
i
n pl
a
i
nt
e
x
t
s
f
or
e
f
f
i
c
i
e
nt
c
r
y
pt
og
r
a
phy
,
”
200
1.
[
1
8]
D
.
J
pdl
o
,
F
.
R
.
P
.
G
hr
ov
dw
y
hhu,
a
nd J
.
F
r
p,
“
A
H
y
br
i
d T
e
c
hni
q
ue
of
C
r
y
pt
og
r
a
phy
a
nd W
a
t
e
r
m
a
r
k
i
ng
f
or
D
a
t
a
E
nc
r
y
pt
i
on a
n
d D
e
c
r
y
pt
i
on.
”
[
1
9]
D
.
J
oh
n a
n
d L
.
M
a
r
t
i
n
,
“
B
i
na
r
y
r
s
a
e
nc
r
y
pt
i
on a
l
g
or
i
t
hm
,
”
pp.
1
78
–
181
,
2
01
6.
[
2
0]
A
.
K
ha
n,
K
.
K
.
M
i
s
hr
a
,
N
.
S
a
nt
hi
,
a
nd J
.
J
a
y
a
k
u
m
a
r
i
,
“
A
N
e
w
H
ybr
i
d T
e
c
hni
que
f
or
D
a
t
a
E
nc
r
y
pt
i
on,
”
no
.
G
c
c
t
,
pp.
92
5
–
92
9,
20
15
.
[
2
1]
W
. U
. X
i
n
g
-
h
u
i
,
“R
es
ear
ch
o
f
t
h
e D
at
ab
as
e E
n
cr
y
p
t
i
o
n
T
ech
n
i
q
u
e
B
a
s
e
d on H
y
br
i
d,
”
p
p.
82
–
8
5,
20
10.
[
2
2]
S
.
R
a
o,
“
A
N
ov
e
l
a
nd H
i
g
hl
y
S
e
c
ur
e
E
nc
r
y
pt
i
on M
e
t
h
od
ol
o
gy
us
i
ng
a
C
o
m
bi
na
t
i
o
n of
A
E
S
a
nd
V
i
s
ua
l
C
r
y
pt
og
r
a
phy
,
”
pp.
16
82
–
16
88
,
20
1
6.
[
2
3]
R
.
Y
e
g
i
r
e
ddi
,
“
A
s
ur
v
e
y
on C
onv
e
nt
i
o
na
l
E
nc
r
y
pt
i
on
A
l
g
or
i
t
hm
s
of
C
r
y
pt
og
r
a
phy
,
”
2016.
[
2
4]
A.
A
zo
u
g
ag
h
e,
Z
.
K
ar
t
i
t
,
M
.
H
ed
ab
o
u
i
,
M
.
B
el
k
as
m
i
,
an
d
M
.
E
.
L
.
M
ar
r
ak
i
,
“
A
n
e
f
f
i
ci
en
t
al
g
o
r
i
t
h
m
f
o
r
d
at
a
s
e
c
ur
i
t
y
i
n c
l
oud s
t
or
a
g
e
,
”
201
6.
[
2
5]
A
.
J
a
i
n,
“
E
nc
r
y
pt
e
d R
e
v
e
r
s
i
bl
e
D
a
t
a
H
i
di
ng
o
n C
om
pr
e
s
s
e
d I
m
a
g
e
,
”
v
ol
.
6
9,
no.
2
5,
pp.
1
–
5,
2
01
3.
[
2
6]
R
.
M
in
n
i,
K
.
S
u
l
ta
n
ia
,
S
.
M
i
s
h
r
a
,
P
.
D
ur
a
i
,
a
nd R
.
V
i
nc
e
nt
,
“
A
n A
l
g
or
i
t
hm
t
o E
n
ha
nc
e
S
e
c
ur
i
t
y
i
n R
S
A
,
”
pp.
4
–
7
,
201
3.
[
2
7]
B
.
K
a
r
t
hi
k
e
y
a
n,
A
.
I
t
,
a
nd V
.
C
o
l
l
e
g
e
,
“
A
C
o
m
bi
ne
d A
ppr
oa
c
h of
S
t
e
g
a
nog
r
a
phy
w
i
t
h
L
S
B
E
nc
odi
ng
t
e
c
hni
q
ue
a
nd D
E
S
A
l
g
or
i
t
hm
,
”
pp.
1
–
4,
2
0
17.
[
2
8]
M
.
V
K
al
e an
d
P
.
S
.
A
.
P
a
t
i
l
,
“
T
e
x
t
H
i
di
ng
I
n M
ul
t
i
m
e
di
a
B
y
H
uf
f
m
a
n E
nc
odi
ng
A
l
gor
i
t
hm
U
s
i
ng
S
t
e
g
a
nog
r
a
phy
,
”
v
ol
.
2,
n
o.
1,
pp
.
1
–
5,
20
16.
[
2
9]
R
.
S
ul
t
a
na
a
nd
T
.
M
.
K
um
a
r
i
,
“
A
n A
S
C
I
I
V
a
l
ue
ba
s
e
d O
pt
i
m
i
z
e
d T
e
x
t
da
t
a
,
”
pp.
6
65
0
–
66
56,
2
01
6.
[
3
0]
U
.
S
i
n
g
h
an
d
U
.
G
ar
g
,
“
A
n
A
S
C
I
I
v
al
u
e b
as
ed
t
e
x
t
da
t
a
e
nc
r
y
pt
i
on
S
y
s
t
e
m
,
”
v
ol
.
3,
no.
1
1,
pp.
1
–
5,
201
3.
[
3
1]
F
.
H
ua
ng
,
J
.
H
ua
ng
,
a
n
d Y
.
S
hi
,
“
N
e
w
F
r
a
m
e
w
or
k
f
or
R
e
v
e
r
s
i
bl
e
D
a
t
a
H
i
di
ng
i
n E
nc
r
y
pt
e
d D
om
a
i
n,
”
v
ol
.
1
1,
n
o.
12,
pp
.
2
77
7
–
2
78
9,
20
16
.
[
3
2]
N
.
B
ho
pa
l
,
“
T
r
a
ns
pos
i
t
i
on
C
r
y
pt
og
r
a
phy
A
l
g
or
i
t
hm
us
i
ng
T
r
e
e
D
a
t
a
S
t
r
uc
t
ur
e
,
”
no.
9
78,
2
01
4.
[
3
3]
S
. K
a
t
a
r
i
a
, T
.
K
u
m
a
r
, K
. S
i
n
g
h
, a
n
d
M
. S
. N
e
h
r
a
,
“
E
C
R
(
e
nc
r
y
pt
i
on w
i
t
h c
ov
e
r
t
e
x
t
and r
e
or
de
r
i
ng)
b
as
e
d t
e
x
t
s
t
e
gan
ogr
a
phy
,
”
2
01
3 I
E
E
E
2n
d
I
nt
.
C
onf
.
I
m
a
ge
I
nf
.
P
r
oc
e
s
s
.
I
E
E
E
I
C
I
I
P
201
3,
pp
.
6
12
–
61
6,
20
13
.
[
3
4]
M
.
Y
.
E
l
m
a
hi
a
nd M
.
H
.
S
a
y
e
d,
“
T
e
x
t
S
t
e
g
a
nog
r
a
phy
U
s
i
ng
C
o
m
pr
e
s
s
i
on a
n
d R
a
n
dom
N
um
be
r
G
e
ne
r
a
t
or
s
,
”
v
ol
.
6,
n
o.
6,
pp
.
2
59
–
26
3,
20
17
.
[
3
5]
S
.
C
ha
u
dha
r
y
a
nd M
.
D
a
v
e
,
“
A
n E
l
uc
i
da
t
i
on
on
S
t
e
g
a
nog
r
a
phy
a
nd C
r
y
pt
og
r
a
phy
,
”
pp.
3
–
8,
20
16
.
[
3
6]
[
A
.
P
.
Ka
u
r
a
n
d
G
.
S
i
n
g
h
,
“
I
NT
E
R
NAT
I
ON
AL
JOUR
N
AL
F
O
R A
D
V
A
N
CE
RE
S
E
A
RCH
IN
E
N
G
IN
E
E
RIN
G
A
N
D
T
E
C
H
N
O
L
O
G
Y
D
e
s
i
g
ni
ng
a
nd
P
e
r
f
or
m
a
nc
e
E
v
a
l
ua
t
i
on o
f
T
e
x
t
D
a
t
a
H
i
di
ng
T
e
c
hni
que
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s
i
ng
S
e
que
nt
i
a
l
E
nc
od
i
ng
a
nd
D
e
c
odi
ng
T
e
c
hni
q
ue
,
”
v
ol
.
3,
no.
I
i
,
pp.
6
–
1
1,
20
15.
[
3
7]
A
.
H
a
m
a
r
s
he
h,
“
E
x
pl
oi
t
i
ng
O
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