T
E
L
K
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MN
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K
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T
el
eco
m
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t
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o
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t
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E
l
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ro
n
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o
n
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ro
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Vo
l
.
19
, N
o
.
5
,
O
ct
o
b
er
2021
, p
p
.
1535
~
1543
I
S
S
N
:
1693
-
6930,
a
c
c
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e
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t
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d F
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r
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r
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by K
e
m
e
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kdi
kt
i
,
D
e
c
r
e
e
N
o:
21/
E
/
K
P
T
/
2018
D
O
I
:
10.
12928/
T
E
L
K
O
M
N
I
K
A
.
v19i
5.
20403
1535
Jou
r
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page
:
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T
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pro
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nf
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m
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Un
ive
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si
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Nu
sa
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t
a
r
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P
G
R
I
Ke
dir
i,
Ke
dir
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I
nd
one
sia
A
rt
i
cl
e I
n
f
o
AB
S
T
RACT
A
r
tic
le
h
is
to
r
y
:
R
ecei
v
ed
S
e
p 16,
2020
R
ev
i
s
ed
J
ul
15,
2021
A
ccep
t
ed
J
ul
29,
2021
E
-
b
us
ine
ss se
c
ur
i
ty be
c
om
e
s a
n im
p
or
ta
nt
is
sue
i
n
the
de
ve
l
opm
e
nt of
te
c
h
no
lo
gy,
t
o e
n
sur
e
t
he
sa
f
e
ty a
nd c
om
f
or
t
of
tr
a
nsa
c
t
ion
s
in
the
e
xc
ha
nge
of
inf
or
m
a
ti
on i
s pr
i
va
c
y.
T
hi
s stu
dy a
im
s to im
pr
o
ve
s
e
c
ur
i
ty in e
-
b
us
ine
ss
sys
te
m
s
us
in
g a
hybr
id
a
l
gor
it
hm
t
ha
t
c
om
bi
ne
s t
wo t
ype
s of
ke
y
s,
na
m
e
l
y
sym
m
e
tr
ic
a
n
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sym
m
e
tr
ic
ke
y
s.
Enc
r
yp
ti
on a
n
d de
c
r
y
pti
on
of
m
e
ssa
ge
s
or
inf
or
m
a
t
io
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a
r
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m
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tr
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in
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ple
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ym
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R
iv
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st
S
ha
m
ir
Adle
m
a
n
(
R
S
A
)
a
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thm
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he
pr
o
po
se
d
hy
br
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d a
l
gor
it
hm
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e
qu
ir
e
s a
hi
g
h r
u
nn
in
g t
im
e
i
n
the
de
c
r
y
pt
io
n pr
oc
e
ss c
om
pa
r
e
d to t
he
a
p
pl
ic
a
t
io
n of
a
s
ing
le
a
l
gor
it
hm
.
The
le
ve
l of
se
c
ur
it
y i
s s
tr
o
ng
e
r
be
c
a
use
it
im
p
le
m
e
n
ts
t
he
pr
oc
e
ss
of
m
e
s
sa
ge
e
nc
r
y
pt
io
n
te
c
h
ni
que
s
w
it
h
tw
o t
ype
s of
ke
ys s
im
u
lta
ne
ous
ly.
Ke
y
wo
r
d
s
:
C
r
ypt
ogr
a
phy
D
e
c
r
ypt
i
on
E
-
bus
i
ne
s
s
s
e
c
ur
i
t
y
E
nc
r
ypt
i
on
R
S
A
a
l
gor
i
t
hm
S
y
mme
tr
ic
k
e
y
T
his
is
a
n
o
pe
n
ac
c
e
s
s
ar
tic
le
u
nde
r
the
CC
B
Y
-
SA
lic
e
n
se
.
C
or
r
e
s
pon
di
n
g A
u
t
h
or
:
L
S
um
a
r
ya
nt
i
D
ep
ar
t
m
en
t
o
f
I
n
f
o
r
m
at
i
cs
U
n
i
v
e
r
si
t
a
s Mu
sa
m
u
s
K
a
m
i
z
a
un R
oa
d,
M
e
r
a
uke
,
I
ndone
s
i
a
E
ma
il:
li
lik
@
u
n
mu
s
.
a
c
.
id
1.
I
NT
RO
DUC
T
I
O
N
E
-
bus
i
ne
s
s
s
ys
t
e
m
s
ha
ve
a
n i
m
por
t
a
nt
r
o
l
e
i
n
t
r
a
n
s
a
c
t
i
on m
a
na
ge
m
e
nt
a
nd bus
i
ne
s
s
pr
oc
e
s
s
e
s
,
a
nd
can
cr
eat
e a co
m
p
et
i
t
i
v
e ad
v
an
t
ag
e,
t
o
co
m
p
et
e i
n
m
ar
k
et
i
n
g
an
d
cu
s
t
o
m
er
s
er
v
i
ce d
ev
el
o
p
m
en
t
.
R
i
c
e m
i
l
l
i
n
g
bus
i
ne
s
s
i
s
one
of
t
he
pr
oc
e
s
s
i
ng i
ndus
t
r
y c
a
t
e
g
or
y b
u
si
n
e
sse
s
[
1]
w
hi
c
h pr
oduc
e
s
r
i
c
e
pr
oduc
t
i
on t
h
a
t is
r
e
a
dy t
o be
m
a
r
ke
t
e
d,
s
o t
hi
s
bus
i
ne
s
s
ha
s
a
n i
m
por
t
a
nt
r
ol
e
i
n
t
he
a
gr
i
bus
i
ne
s
s
s
ys
t
e
m
i
n r
i
c
e
i
n
I
ndone
s
i
a
[
2]
.
T
he
ne
e
d f
or
i
nc
r
e
a
s
e
d c
us
t
om
e
r
s
e
r
vi
c
e
a
nd t
r
a
ns
a
c
t
i
on s
e
c
ur
i
t
y,
f
or
bus
i
ne
s
s
pr
oc
e
s
s
m
a
na
ge
m
e
nt
a
nd pr
e
s
e
nt
i
ng i
nf
or
m
a
t
i
on i
n
r
e
a
l
-
t
i
m
e
,
ha
s
be
c
om
e
a
ne
w
r
e
vol
ut
i
on a
s
a
br
e
a
kt
hr
ough i
n
u
tiliz
in
g
th
e
c
a
p
a
b
ilitie
s
o
f
in
te
r
n
e
t te
c
h
n
o
lo
g
y
us
i
ng
e
-
bus
i
ne
s
s
[
3]
.
I
n
t
e
r
ne
t
ne
t
w
or
ks
ha
ve
i
nnova
t
e
d
c
i
vi
l
i
z
a
t
i
on f
r
om
a
l
l
di
r
e
c
t
i
ons
,
a
nd
ha
ve
t
r
a
ns
f
or
m
e
d bus
i
ne
s
s
pr
o
ces
s
es
i
n
t
o
a s
er
i
es
o
f
el
ect
r
o
n
i
c
-
b
as
ed
f
i
n
an
ci
al
t
r
an
s
act
i
o
n
s
[
4]
.
E
-
b
u
s
i
n
es
s
s
y
s
t
em
s
acces
s
ed
t
h
r
o
ugh t
he
i
nt
e
r
ne
t
f
o
r
bus
i
ne
s
s
pr
oc
e
s
s
m
a
na
ge
m
e
nt
,
e
l
e
c
t
r
oni
c
c
om
m
e
r
c
e
,
t
r
a
ns
a
c
t
i
ons
be
t
w
e
e
n bus
i
ne
s
s
pa
r
t
ne
r
s
,
c
us
t
om
e
r
s
,
s
uppl
i
e
r
s
,
a
nd ot
he
r
s
t
a
ke
hol
de
r
s
i
n t
he
c
om
pa
ny
[
5]
.
T
he
de
ve
l
opm
e
n
t
of
e
-
bus
i
ne
s
s
s
ys
t
e
m
s
c
a
n i
m
pr
ove
c
us
t
om
e
r
s
e
r
vi
c
e
[
6]
,
bus
i
ne
s
s
e
f
f
i
c
i
e
nc
y,
a
nd pr
ovi
de
i
n
f
or
m
a
t
i
on a
c
c
or
di
ng t
o us
e
r
ne
e
ds
[
7]
,
[
8]
.
T
he
oppor
t
u
ni
t
y f
or
e
-
b
u
si
n
e
ss
[
9]
t
o be
c
om
e
a
m
e
a
ns
of
s
uppor
t
i
ng bus
i
ne
s
s
i
s
t
he
s
t
r
e
ngt
h of
t
he
c
om
pa
ny i
s
c
om
pe
t
i
ng i
n
m
ode
r
n m
a
r
ke
t
s
[
1
0]
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SSN
:
1693
-
6930
T
E
L
KOM
NI
KA
T
el
eco
m
m
u
n
C
om
put
E
l
C
ont
r
o
l
,
Vo
l
.
19
, N
o
.
5
,
O
c
t
obe
r
2021:
1535
-
1543
1536
M
a
na
ge
m
e
nt
of
bus
i
ne
s
s
t
r
a
ns
a
c
t
i
on
s
i
n a
n e
-
b
u
si
n
e
ss sy
st
e
m
c
r
e
a
t
e
s
va
r
i
ous
pr
obl
e
m
s
,
one
of
w
h
ic
h
is
tr
a
n
s
a
c
tio
n
s
e
c
u
r
ity
[
1
1]
.
S
ecu
r
i
t
y
g
u
a
r
an
t
ees
i
n
e
-
bus
i
ne
s
s
s
ys
t
e
m
s
m
us
t
be
pr
ov
i
de
d
[
12]
,
t
o
m
a
i
nt
a
i
n t
he
c
onve
ni
e
nc
e
of
c
us
t
om
e
r
s
a
nd c
om
pa
ni
e
s
i
n c
onduc
t
i
ng
bus
i
ne
s
s
t
r
a
ns
a
c
t
i
ons
.
S
e
c
ur
i
t
y
i
m
pl
e
m
e
nt
a
t
i
on c
a
n be
done
t
hr
ough
va
r
i
ou
s
t
e
c
hni
que
s
s
uc
h a
s
e
nc
r
ypt
i
on w
i
t
h hom
o
m
or
phi
c
a
lg
o
r
ith
ms
[
1
3]
.
R
i
s
k c
ont
r
ol
t
o
e
ns
ur
e
t
r
a
ns
a
c
t
i
on s
e
c
ur
i
t
y
i
n s
ys
t
e
m
de
ve
lo
p
me
n
t
w
ith
e
le
c
tr
o
n
ic
t
r
a
ns
a
c
t
i
ons
us
i
ng a
qua
nt
i
t
a
t
i
ve
m
ode
l
.
D
e
t
e
r
m
i
na
t
i
on of
s
t
a
nda
r
ds
a
nd l
i
m
i
t
s
o
f
t
r
a
ns
a
c
t
i
on s
e
c
ur
i
t
y
i
nvol
vi
ng a
ut
om
a
t
i
c
i
nf
o
r
m
a
t
i
on e
xc
ha
nge
us
i
ng
a
c
he
c
ke
r
m
ode
l
[
1
4]
. E
-
bus
i
ne
s
s
m
a
t
ur
i
t
y i
s
a
c
om
bi
na
t
i
on
of
va
r
i
ous
bus
i
ne
s
s
pr
oc
e
s
s
e
s
t
ha
t
i
nvol
ve
bus
i
ne
s
s
s
t
r
uc
t
ur
e
a
nd a
c
t
i
vi
t
y
m
a
na
ge
m
e
nt
,
w
hi
c
h ut
i
l
i
z
e
t
e
c
hnol
ogy t
o
i
m
pr
ove
s
e
r
vi
c
e
s
a
nd c
onve
ni
e
nc
e
i
n t
r
a
ns
a
c
t
i
ons
[
15]
.
S
ecu
r
i
t
y
i
s
s
u
es
b
eco
m
e a ch
al
l
en
g
e f
o
r
e
l
e
c
t
r
oni
c
t
r
a
ns
a
c
t
i
ons
i
nvol
vi
ng onl
i
ne
c
om
m
uni
c
a
t
i
on,
s
o a
s
ys
t
e
m
t
ha
t
c
a
n pr
ot
e
c
t
a
ga
i
ns
t
a
t
t
a
c
ks
or
m
i
s
u
s
e o
f
d
at
a i
s
n
eed
ed
,
as
a r
es
u
l
t
of
bus
i
ne
s
s
pr
oc
e
s
s
c
om
pl
e
x pr
obl
e
m
s
a
nd i
nf
or
m
a
t
i
on
e
xc
ha
nge
vul
ne
r
a
bi
l
i
t
i
e
s
,
s
o a
s
e
c
ur
i
t
y m
ode
l
w
i
t
h c
r
ypt
ogr
a
phi
c
t
e
c
hni
que
s
i
s
de
ve
l
ope
d
[
16]
.
An
e
-
bus
i
ne
s
s
s
y
s
te
m is
s
a
i
d t
o be
good
i
f
i
t
c
a
n
a
c
c
om
m
oda
t
e
a
l
l
bus
i
ne
s
s
pr
oc
e
s
s
e
s
,
a
nd m
e
e
t
t
he
i
n
f
or
m
a
t
i
on
ne
e
ds
of
i
t
s
u
se
r
s
[
17]
,
s
ha
r
e
i
nf
or
m
a
t
i
on
a
bout
p
r
oduc
t
s
a
nd c
a
n di
r
e
c
t
l
y c
onduc
t
t
r
a
ns
a
c
t
i
ons
.
E
nc
r
ypt
i
on i
n c
r
ypt
og
r
a
phy i
s
a
pr
oc
e
s
s
of
e
nc
odi
ng i
nf
or
m
a
t
i
on t
ha
t
r
e
f
e
r
s
t
o t
he
s
e
c
ur
i
t
y of
c
om
put
e
r
-
ba
s
e
d i
nf
or
m
a
t
i
on c
ont
e
nt
.
T
he
d
i
gi
t
a
l
s
i
gna
t
ur
e
a
ut
he
nt
i
c
a
t
i
on s
ys
t
e
m
us
e
s
t
he
c
o
nc
e
pt
of
a
s
ym
m
e
t
r
i
c
ke
y c
r
ypt
og
r
a
phy,
i
m
pl
e
m
e
nt
i
ng
ha
s
h f
unc
t
i
ons
t
o e
ns
ur
e
doc
um
e
nt
a
ut
he
nt
i
c
i
t
y
a
nd
i
nt
e
gr
i
t
y.
F
act
o
r
s
af
f
ect
i
n
g
t
h
e i
n
s
ecu
r
i
t
y
o
f
i
n
f
o
r
m
at
i
o
n
ex
ch
an
g
e can
ar
i
s
e d
u
e t
o
,
i
n
ex
p
er
i
en
ced
u
s
e
r
s
,
w
eak
pa
s
s
w
or
ds
,
or
i
m
p
r
ope
r
l
y
c
onf
i
gur
e
d
s
e
c
ur
i
t
y s
e
t
t
i
ngs
[
18]
.
T
r
an
s
act
i
o
n
s
ecu
r
i
t
y
i
n
e
-
bus
i
ne
s
s
i
s
c
a
r
r
i
e
d out
ba
s
e
d on t
he
s
e
que
nc
e
of
a
c
t
i
vi
t
i
e
s
.
S
e
c
ur
i
t
y
f
a
c
i
l
i
t
i
e
s
f
or
s
e
l
l
i
ng p
r
oduc
t
s
a
nd i
m
p
r
ovi
ng s
e
r
vi
c
e
s
c
a
n
a
ssi
st
i
n pr
ovi
di
ng
r
e
f
e
r
e
nc
e
s
f
or
i
nf
or
m
a
t
i
on i
m
pr
ove
m
e
nt
.
T
w
o
c
om
m
on m
e
t
hods
a
r
e
us
e
d t
o
s
e
c
ur
e
a
nd pr
ot
e
c
t
t
he
i
nf
or
m
a
t
i
on
,
na
m
e
l
y
c
r
ypt
ogr
a
phy
a
nd s
t
e
ga
nogr
a
phy.
I
nf
or
m
a
t
i
on
s
e
c
ur
i
t
y i
s
ve
r
y
i
m
po
r
t
a
nt
b
e
c
a
us
e
i
t
s
uppor
t
s
t
he
pe
r
f
o
r
m
a
nc
e
of
e
-
bus
i
ne
s
s
s
ys
t
e
m
s
,
i
n i
m
pr
ovi
ng
s
e
r
vi
c
e
s
t
o
c
us
t
om
e
r
s
[
19]
.
C
r
yp
t
ogr
a
phy i
s
a
t
e
c
hni
que
of
m
a
ki
ng
m
e
s
s
a
ge
s
or
i
n
f
or
m
a
t
i
on
s
e
c
r
e
t
a
nd
c
a
n onl
y
be
a
c
c
e
s
s
e
d by a
ut
hor
i
z
e
d
us
e
r
s
t
h
r
ou
gh a
n
e
nc
r
ypt
i
on pr
oc
e
s
s
us
i
ng a
m
a
t
he
m
a
t
i
c
a
l
m
ode
l
t
o
r
e
c
ove
r
s
e
c
r
e
t
ke
ys
f
r
om
c
r
ypt
ogr
a
phi
c
de
vi
c
e
s
[
20]
.
T
h
i
s
s
tu
d
y
a
ims
to
imp
r
o
v
e
s
e
c
u
r
ity
in
th
e
e
-
b
u
s
in
e
s
s
s
y
s
te
m f
o
r
r
ic
e
m
illin
g
s
ma
ll a
n
d
me
d
iu
m
-
s
i
zed
en
t
er
p
r
i
se
s
(
S
ME
s)
by
i
m
pl
e
m
e
nt
i
ng c
r
ypt
ogr
a
phi
c
a
l
go
r
i
t
h
m
s
,
w
hi
c
h c
a
n s
t
r
e
ngt
he
n
pa
s
s
w
or
ds
on us
e
r
a
c
c
ount
s
a
nd
hi
de
t
he
e
xc
ha
nge
o
f
t
r
a
ns
a
c
t
i
on i
nf
o
r
m
a
t
i
on.
D
i
gi
t
a
l
t
r
a
ns
a
c
t
i
on s
e
c
ur
i
t
y
t
r
a
ns
m
i
t
t
e
d ove
r
c
om
put
e
r
ne
t
w
or
ks
c
a
n be
s
e
c
ur
e
d,
us
i
ng c
r
yp
t
ogr
a
phi
c
t
e
c
hni
que
s
,
w
hi
c
h
c
om
bi
ne
s
ym
m
e
t
r
i
c
a
nd
a
s
ym
m
e
t
r
i
c
ke
ys
,
s
o t
ha
t
onl
y
a
ut
hor
i
z
e
d us
e
r
s
c
a
n
a
c
c
e
s
s
a
nd vi
e
w
c
onf
i
de
nt
i
a
l
da
t
a
i
n
f
or
m
a
t
i
on
,
by
i
m
pl
e
m
e
nt
i
ng
a
hyb
r
i
d
a
l
gor
i
t
hm
f
or
m
e
s
s
a
ge
e
nc
odi
ng
[
21]
.
T
he
p
r
o
pos
e
d hybr
i
d a
l
gor
i
t
hm
us
e
s
a
c
om
bi
na
t
i
on of
s
i
m
pl
e
s
y
mme
tr
ic
a
lg
o
r
ith
ms
a
nd
t
he
us
e
of
publ
i
c
a
nd pr
i
va
t
e
ke
ys
by a
ppl
yi
ng
t
he
R
iv
e
s
t S
h
a
mir
A
d
le
ma
n
(
RS
A
)
a
lg
o
r
ith
m.
2.
P
R
OP
OS
E
D
H
YB
RI
D AL
G
O
RI
T
H
M
C
r
ypt
ogr
a
phi
c
t
e
c
hni
que
s
a
r
e
t
he
pr
oc
e
s
s
of
e
n
c
r
ypt
i
ng c
onf
i
de
nt
i
a
l
o
r
pr
i
va
t
e
i
nf
o
r
m
a
t
i
on t
o
ma
in
ta
in
th
e
c
o
n
f
id
e
n
tia
lity
o
f
m
es
s
ag
es
,
e
xc
e
pt
f
o
r
a
ut
hor
i
z
e
d us
e
r
s
.
T
he
r
e
a
r
e
t
w
o
i
m
por
t
a
nt
c
om
po
ne
nt
s
i
n
t
he
da
t
a
e
nc
r
ypt
i
on pr
oc
e
s
s
,
na
m
e
l
y a
l
gor
i
t
hm
s
a
n
d ke
ys
.
A
l
gor
i
t
hm
s
a
r
e
ge
ne
r
a
l
l
y pub
l
i
s
he
d w
hi
l
e
ke
ys
a
r
e
ke
pt
s
e
c
r
e
t
t
o e
ns
ur
e
s
e
c
ur
i
t
y.
T
he
a
ppl
i
c
a
t
i
on of
c
r
ypt
ogr
a
phy
i
s
di
vi
de
d i
nt
o
t
w
o
t
ype
s
of
ke
ys
,
na
m
e
l
y
s
ym
m
e
t
r
i
c
a
l
a
nd a
s
ym
m
e
t
r
i
c
a
l
.
T
hi
s
s
t
udy pr
opos
e
s
a
hybr
i
d a
l
gor
i
t
hm
t
ha
t
c
om
bi
ne
s
t
he
us
e
of
t
he
s
ym
m
e
t
r
i
c
ke
y a
nd a
n a
s
ym
m
e
t
r
i
c
ke
y s
i
m
ul
t
a
ne
ous
l
y t
o e
nc
r
ypt
m
e
s
s
a
ge
s
.
T
he
a
ppl
i
c
a
t
i
on of
s
ym
m
e
t
r
i
c
k
e
y
s
u
s
e
s
a
s
imp
le
s
y
mme
tr
ic
a
lg
or
i
t
hm
,
a
nd
t
he
a
ppl
i
c
a
t
i
on
of
a
s
ym
m
e
t
r
i
c
ke
ys
us
e
s
t
he
R
S
A
a
l
gor
i
t
hm
,
ba
s
e
d on t
w
o
m
a
t
he
m
a
t
i
c
a
l
pr
obl
e
m
s
,
na
m
e
l
y
nu
m
be
r
f
a
c
t
or
i
z
a
t
i
on
a
nd
m
odul
o
ope
r
a
t
i
ons
.
T
he
a
p
pl
i
c
a
t
i
on
of
t
hi
s
a
l
go
r
i
t
hm
pr
oduc
e
s
t
w
o di
f
f
e
r
e
nt
ke
ys
but
c
onne
c
t
e
d m
a
t
he
m
a
t
i
c
a
l
l
y
[
22]
.
T
he
ke
y
f
or
t
he
e
nc
r
ypt
i
on
pr
oc
e
s
s
i
s
know
n a
s
t
he
publ
i
c
ke
y a
nd t
he
ke
y us
e
d f
or
de
c
r
ypt
i
on
i
s
t
he
pr
i
va
t
e
ke
y.
B
ot
h a
r
e
ke
y
pa
i
r
s
t
ha
t
w
i
l
l
be
us
e
d i
n
s
e
c
ur
i
ng m
e
s
s
a
ge
s
or
i
nf
or
m
a
t
i
on
[
23]
,
[
24]
.
T
he
s
t
e
ps
of
t
he
hy
b
r
i
d a
l
go
r
i
t
hm
a
r
e
s
how
n i
n
F
i
gur
e
1,
w
hi
c
h i
s
de
s
c
r
i
be
d a
s
f
ol
l
ow
s
;
−
T
h
e
p
la
in
te
x
t is
o
r
ig
in
a
l o
r
in
itia
l me
s
s
a
g
e
s
lik
e
h
u
ma
n
la
n
g
u
a
g
e
in
g
e
n
e
r
a
l.
−
E
nc
r
ypt
i
on
i
s
t
he
p
r
oc
e
s
s
of
e
nc
odi
ng
a
m
e
s
s
a
ge
pl
a
i
nt
e
xt
i
nt
o
c
i
phe
r
t
e
xt
us
i
ng
a
s
pe
c
i
f
i
c
a
l
gor
i
t
h
m
t
o
g
en
er
a
t
e
a
publ
i
c
ke
y,
r
e
s
ul
t
i
ng i
n
m
e
s
s
a
ge
s
t
ha
t
ha
ve
no m
e
a
ni
ng.
−
D
e
c
r
ypt
i
on i
s
t
he
p
r
oc
e
s
s
of
t
r
a
ns
l
a
t
i
ng
t
he
m
e
s
s
a
ge
e
nc
r
ypt
e
d
(
c
i
phe
r
t
e
xt
)
us
i
ng
a
p
r
i
va
t
e
ke
y
,
t
h
e
r
e
by
pr
oduc
i
ng a
n unde
r
s
t
a
nda
bl
e
m
e
s
s
a
ge
(
pl
a
i
nt
e
xt
)
.
−
C
hi
pe
r
t
e
xt
i
s
a
m
e
s
s
a
ge
t
ha
t
ha
s
be
e
n e
nc
r
ypt
e
d
a
nd c
a
nnot
be
unde
r
s
t
ood by
una
ut
hor
i
z
e
d
or
l
e
gi
t
i
m
a
t
e
u
se
r
s.
I
nf
or
m
a
t
i
on
s
e
c
ur
i
t
y by
a
ppl
yi
ng a
hybr
i
d
a
l
gor
i
t
hm
c
ons
i
s
t
s
of
t
w
o a
c
t
or
s
,
na
m
e
l
y
t
he
s
e
nde
r
a
nd
r
ecei
v
er
o
f
t
h
e m
es
s
ag
e.
T
h
e
m
es
s
ag
e en
co
d
i
n
g
s
t
ag
e b
eg
i
n
s
w
ith
p
la
in
te
x
t
w
h
ic
h
is
th
e
o
r
ig
in
a
l in
f
o
r
ma
tio
n
t
ha
t
w
i
l
l
be
s
e
nt
by t
he
s
e
nde
r
o
f
t
he
m
e
s
s
a
ge
,
t
he
n t
he
s
ym
m
e
t
r
i
c
ke
y
e
nc
r
ypt
i
on
pr
oc
e
s
s
i
s
c
a
r
r
i
e
d
out
us
i
ng
a
s
imp
le
s
y
mme
tr
ic
a
lg
o
r
ith
m
,
th
e
r
e
s
u
lts
o
f
s
y
mme
tr
ic
k
e
y
e
n
c
r
y
p
tio
n
a
r
e
u
s
e
d
in
th
e
a
s
y
mm
e
tr
i
c k
ey
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1537
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ypt
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oc
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ha
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ppl
i
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R
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a
l
gor
i
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hm
[
25]
,
a
nd p
r
oduc
e
s
a
publ
i
c
ke
y.
C
hi
pe
r
t
e
xt
c
a
n be
r
e
a
d by
doi
ng t
he
de
c
r
ypt
i
on
pr
oc
e
s
s
us
i
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p
r
i
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t
e
ke
y
a
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oduc
i
ng
pl
a
i
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xt
t
ha
t
i
s
s
t
i
l
l
e
nc
r
ypt
e
d,
t
he
n t
he
r
e
s
ul
t
s
a
r
e
us
e
d i
n
t
he
de
c
r
ypt
i
on
pr
oc
e
s
s
w
i
t
h
a
s
ym
m
e
t
r
i
c
ke
y
t
o
pr
oduc
i
ng
t
he
or
i
gi
na
l
m
e
s
s
a
ge
or
pl
a
i
nt
e
xt
.
T
he
a
ppl
i
c
a
t
i
on
o
f
t
he
R
S
A
a
l
gor
i
t
hm
c
ons
i
s
t
s
of
t
hr
e
e
m
a
i
n p
r
oc
e
s
s
e
s
,
na
m
e
l
y ke
y ge
ne
r
a
t
i
on,
e
nc
r
ypt
i
on,
a
nd de
c
r
yp
t
i
on
[
26]
.
F
i
gur
e
1.
B
l
oc
k
di
a
gr
a
m
of
t
he
pr
opos
e
d a
l
gor
i
t
hm
2.
1.
Si
m
pl
e
s
ym
m
e
t
r
i
c
al
gor
i
t
h
m
A
ppl
i
c
a
t
i
on of
s
ym
m
e
t
r
i
c
ke
y w
i
t
h
a
n e
nc
r
ypt
i
on
a
nd de
c
r
ypt
i
on
pr
oc
e
s
s
us
i
ng t
he
s
a
m
e
ke
y
[
27]
.
S
e
nde
r
s
a
nd
r
eci
p
i
en
t
s
o
f
m
es
s
ag
es
u
s
e t
h
e s
am
e k
ey
m
o
d
el
t
o
b
e ab
l
e
t
o
acces
s
i
n
f
o
r
m
at
i
o
n
[
2
8]
.
S
y
mme
tr
ic
a
l
gor
i
t
hm
s
a
r
e
m
os
t
c
om
m
onl
y
us
e
d be
c
a
us
e
t
he
y c
a
n be
c
om
bi
ne
d w
i
t
h
ot
he
r
a
l
gor
i
t
hm
s
t
o
i
nc
r
e
a
s
e
s
e
c
ur
i
t
y,
ha
ve
good
h
ar
d
w
ar
e
an
d
s
o
f
t
w
ar
e
p
er
f
o
r
m
an
ce,
ef
f
i
ci
en
cy
,
an
d
f
l
ex
i
b
i
l
i
t
y
[
29]
.
S
y
m
m
et
r
i
c
k
ey
m
ode
l
i
ng a
c
c
or
di
ng
t
o
a
l
pha
be
t
i
c
l
e
t
t
e
r
s
f
r
om
A
t
o
Z
,
a
nd
num
e
r
i
c
f
r
om
0 t
o
9
,
by p
r
ovi
di
n
g i
nt
e
ge
r
i
n
i
t
i
al
i
zat
i
o
n
f
o
r
each
al
p
h
ab
et
an
d
n
u
m
er
i
c
,
s
u
ch
as
A
=1
,
B
=2
…
.
,
9
=3
6
.
M
ean
w
h
i
l
e,
s
p
aces
ar
e i
n
i
t
i
al
i
zed
w
ith
th
e
i
nt
e
ge
r
37.
−
E
nc
r
ypt
i
on
t
e
c
hni
que
a.
M
a
k
e
a
s
imp
le
in
te
g
e
r
in
itia
liz
a
tio
n
f
o
r
e
a
c
h
le
tte
r
o
f
th
e
a
lp
h
a
b
e
t a
n
d
n
u
me
r
ic
,
a
s
s
u
min
g
I
b.
C
hoos
e
a
n i
nt
e
ge
r
r
a
ndom
l
y a
s
s
um
e
i
t
i
s
n
c.
F
i
nd t
he
va
l
ue
n
-
1
us
i
ng t
he
m
od 37
ope
r
a
t
i
on,
a
s
s
um
e
i
t
i
s
k
d.
C
h
o
o
s
e a n
eg
at
i
v
e n
u
m
b
er
as
a s
af
eg
u
ar
d
,
as
s
u
m
e n
a
e.
F
i
nd t
he
va
l
ue
o
f
n
a
-
1
us
i
ng
m
od 37
,
a
s
s
um
e
i
t
i
s
k
1
−
D
e
c
r
ypt
i
on
t
e
c
hni
que
a.
T
h
e
a
s
s
ig
n
me
n
t o
f
a
v
a
lu
e
in
th
e
f
o
r
m
o
f
a
n
in
te
g
e
r
a
c
c
o
r
d
in
g
to
th
e
in
itia
liz
a
tio
n
f
o
r
each
l
et
t
er
i
n
t
h
e
c
ip
h
e
r
te
x
t,
a
s
s
u
me
it is
I
b.
M
ul
t
i
pl
y t
he
va
l
ue
I
by
t
he
r
a
ndom
va
l
ue
s
e
l
e
c
t
e
d i
n t
he
e
nc
r
ypt
i
on
pr
oc
e
s
s
o ge
t
t
he
va
l
ue
s
of
k
a
nd k
1
c.
C
a
l
c
ul
a
t
e
us
i
ng t
he
37 m
odul
o ope
r
a
t
i
on
d.
F
i
nd t
he
pl
a
i
nt
e
xt
w
i
t
h
P
=
(
I
*k*k1)
m
od
37
2.
2.
A
p
p
lic
a
t
io
n
o
f
a
s
y
m
m
et
ri
c k
ey
s
u
s
i
n
g
t
h
e
RS
A
al
gor
i
t
h
m
R
S
A
a
l
gor
i
t
hm
ha
s
a
w
or
ki
ng c
onc
e
pt
t
ha
t
i
s
f
a
c
t
or
i
ng t
w
o l
a
r
ge
i
nt
e
ge
r
s
s
o
th
a
t it b
e
c
o
me
s
a
p
r
o
b
le
m th
a
t is
d
if
f
ic
u
lt a
n
d
c
ha
l
l
e
ngi
ng
,
but
t
he
e
nc
r
ypt
i
on s
t
r
e
ngt
h l
i
e
s
i
n t
he
ke
y l
e
ngt
h,
i
f
w
e
a
dd t
he
l
e
ngt
h or
s
i
z
e o
f
t
h
e
k
ey
i
s
t
h
e
en
cr
y
p
t
i
o
n
l
ev
el
w
i
l
l
al
s
o
i
n
cr
eas
e g
r
ad
u
al
l
y
[
3
0]
.
T
he
m
a
i
n
us
e
of
t
he
R
S
A
al
g
o
r
i
t
h
m
b
ecau
s
e i
t
i
s
t
h
e m
o
s
t
s
ecu
r
e k
ey
ex
ch
an
g
e m
ech
an
i
s
m
[
31]
,
t
he
a
ppr
op
r
i
a
t
e
dom
a
i
n
f
or
t
he
imp
le
me
n
ta
tio
n
o
f
th
is
a
lg
o
r
ith
m is
to
s
e
c
u
r
e
d
ig
ita
l k
e
y
tr
a
n
s
p
o
r
t s
ig
n
a
tu
r
e
s
[
32]
.
T
h
e s
t
ag
es
o
f
t
h
e R
S
A
a
l
gor
i
t
hm
i
s
de
s
c
r
i
be
d a
s
f
ol
l
ow
s
[
33]
.
−
P
r
o
ced
u
r
e f
o
r
g
en
er
at
i
n
g
ke
ys
a.
C
hoos
e
t
w
o
l
a
r
ge
pr
i
m
e
nu
m
be
r
s
a
t
r
a
ndom
p
a
nd
q,
t
he
c
ondi
t
i
on
p≠
q.
b.
C
al
cu
l
at
e t
h
e v
al
u
e o
f
n
=p
×q
.
c.
C
al
cu
l
at
e m
=
(p
-
1
)(q
-
1)
.
d.
S
el
ect
an
i
n
t
eg
er
e
s
u
ch
t
h
at
1
<e<m
Encryption
Descryption
Plaintext
Sender
Chipertext
Network
(
Web page
)
Receiver
Symmetric Key
(
Private Key
)
RSA Public Key
Symmetric
Private Key
RSA Private Key
Plaintext
Evaluation Warning : The document was created with Spire.PDF for Python.
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m
m
u
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put
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l
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19
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o
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5
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c
t
obe
r
2021:
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e.
C
al
cu
l
at
e d
t
o
s
at
i
s
f
y
t
h
e co
n
g
r
u
en
ce
r
el
at
i
o
n
s
h
i
p
d
×e=1
m
o
d
m
;
d
i
s
s
t
o
r
ed
as
a p
r
i
v
at
e k
ey
f.
T
h
e
publ
i
c
ke
y
i
s
(
e
,
n)
a
nd t
he
p
r
i
va
t
e
ke
y
i
s
(
n,
d
)
.
g.
K
e
e
p a
l
l
d,
p,
q a
nd m
va
l
ue
s
c
onf
i
de
nt
i
a
l
.
−
E
nc
r
ypt
i
on p
r
oc
e
s
s
,
i
f
pl
a
i
nt
e
xt
P
<
n,
t
he
n
c
i
phe
r
t
e
xt
C
=
P
e
m
od
n.
−
T
he
de
c
r
ypt
i
on p
r
oc
e
s
s
pr
oduc
e
s
P
l
a
i
nt
e
xt
:
P
=
C
d
m
od n
2.
3.
Hy
b
r
id
al
gor
i
t
h
m
T
he
a
ppl
i
c
a
t
i
on
of
a
hybr
i
d
a
l
gor
i
t
h
m
i
s
ba
s
e
d o
n t
he
c
onc
e
pt
of
w
or
k
i
ng
t
w
o ke
y
t
ype
s
na
m
e
l
y
s
ym
m
e
t
r
i
c
a
nd a
s
ym
m
e
t
r
i
c
ke
ys
.
T
hi
s
a
l
gor
i
t
h
m
c
om
bi
ne
s
t
he
t
w
o ke
ys
s
i
m
ul
t
a
ne
ous
l
y on
m
e
s
s
a
ge
e
nc
r
ypt
i
on a
nd
de
c
r
ypt
i
on
pr
oc
e
s
s
,
t
he
m
e
r
ge
r
o
f
t
w
o ke
y
r
e
a
s
ons
,
i
n
or
de
r
t
o
i
m
pr
ove
t
he
s
e
c
ur
i
t
y
m
e
s
s
a
ge
w
i
t
h t
he
m
odi
f
i
e
d a
l
go
r
i
t
hm
.
S
e
ve
r
a
l
pr
e
vi
ous
s
t
udi
e
s
ha
ve
i
m
pl
e
m
e
nt
e
d s
e
ve
r
a
l
a
l
gor
i
t
hm
mo
d
if
ic
a
tio
n
s
[
34]
t
o
i
m
pr
ove
t
he
s
e
c
ur
i
t
y o
f
i
n
f
or
m
a
t
i
on e
xc
ha
nge
us
i
ng c
r
ypt
ogr
a
phi
c
t
e
c
hni
q
ue
s
.
T
he
pr
opos
e
d a
l
gor
i
t
hm
w
o
r
ks
:
−
E
nc
r
ypt
i
on
p
r
o
ces
s
E
nc
odi
ng t
he
o
r
i
gi
na
l
m
e
s
s
a
ge
i
s
c
a
l
l
e
d "
pl
a
i
nt
e
xt
"
,
done
i
n
t
he
f
ol
l
ow
i
ng s
t
e
ps
;
a.
P
l
a
i
nt
e
xt
e
nc
r
ypt
i
on
us
e
s
a
s
ym
m
e
t
r
i
c
ke
y,
t
h
e
e
nc
r
ypt
i
on t
e
c
hni
que
a
ppl
i
e
s
a
s
i
m
pl
e
s
ym
m
e
t
r
i
c
a
l
gor
i
t
hm
,
w
i
t
h w
or
k
s
t
e
ps
a
s
s
how
n i
n s
ub
-
c
ha
pt
e
r
2.
1
.
b.
G
e
ne
r
a
t
i
ng publ
i
c
a
nd p
r
i
va
t
e
ke
ys
f
or
a
s
ym
m
e
t
r
i
c
ke
ys
us
i
ng t
he
R
S
A
a
l
gor
i
t
hm
.
c.
T
he
e
nc
r
ypt
i
on r
e
s
ul
t
i
n poi
nt
(
a
)
i
s
us
e
d a
s
pl
a
i
nt
e
xt
i
n t
he
ne
xt
e
nc
r
ypt
i
on pr
oc
e
s
s
by a
ppl
yi
ng t
he
R
S
A
a
l
gor
i
t
hm
us
i
ng a
publ
i
c
ke
y
,
t
he
w
or
k s
t
e
ps
a
r
e
s
how
n i
n s
ub
-
c
ha
pt
e
r
2.
2
.
T
hi
s
pr
oc
e
s
s
w
i
l
l
pr
o
duc
e
ci
p
h
er
t
ex
t
.
−
D
e
c
r
ypt
i
on
p
r
o
ces
s
a.
T
he
t
r
a
ns
l
a
t
i
on of
c
i
phe
r
t
e
xt
m
e
s
s
a
ge
s
be
gi
ns
w
i
t
h
a
ppl
yi
ng a
n a
s
ym
m
e
t
r
i
c
ke
y,
na
m
e
l
y
,
de
c
r
ypt
i
on
us
i
ng
t
he
R
S
A
a
l
gor
i
t
hm
w
i
t
h
a
p
r
i
va
t
e
ke
y,
t
he
w
or
k s
t
e
ps
c
a
n be
s
e
e
n i
n s
ub
-
c
ha
pt
e
r
2.
2
.
T
he
r
e
s
ul
t
s
o
f
t
he
de
c
r
ypt
i
on
pr
oc
e
s
s
w
i
l
l
pr
oduc
e
p
l
a
i
nt
e
xt
t
ha
t
w
i
l
l
be
us
e
d i
n t
he
ne
xt
pr
oc
e
s
s
.
b.
D
e
c
r
y
p
tio
n
w
ith
a
s
y
mme
tr
ic
k
e
y
u
s
in
g
a
s
imp
l
e
s
y
mme
tr
ic
a
lg
o
r
ith
m
,
th
e
p
r
o
c
e
s
s
o
f
tr
a
n
s
la
tin
g
th
e
m
e
s
s
a
ge
f
r
om
poi
nt
(
a
)
w
i
t
h
t
he
s
ym
m
e
t
r
i
c
pr
i
va
t
e
ke
y,
w
hi
c
h
pr
oduc
e
s
pl
a
i
nt
e
xt
o
r
t
he
o
r
i
g
i
n
al
m
es
s
ag
e.
3.
R
ES
U
LTS
A
ND ANAL
YS
I
S
3.
1.
S
el
ect
i
o
n
o
f
i
n
t
e
ge
r
val
u
e
f
or
p
l
ai
n
t
e
xt
i
n
i
t
i
al
i
z
at
i
on
I
m
pl
e
m
e
nt
a
t
i
on of
a
s
ym
m
e
t
r
i
c
ke
y
a
l
gor
i
t
hm
be
gi
ns
by s
e
l
e
c
t
i
ng a
n
i
nt
e
ge
r
f
or
e
a
c
h l
e
t
t
e
r
of
t
he
a
l
pha
be
t
a
nd
num
e
r
i
c
.
D
e
t
e
r
m
i
ni
ng
t
he
va
l
ue
of
t
he
i
nt
e
ge
r
w
i
l
l
be
us
e
d i
n
t
he
e
nc
r
ypt
i
on a
nd de
c
r
ypt
i
on
pr
oc
e
s
s
by a
ppl
yi
ng t
he
s
ym
m
e
t
r
i
c
ke
y
.
T
he
i
ni
t
i
a
l
i
z
a
t
i
on s
t
a
ge
s
of
i
nt
e
ge
r
va
l
ue
s
f
or
a
l
pha
be
t
i
c
l
e
t
t
e
r
s
s
t
a
r
t
f
r
om
A
t
o
Z
,
w
i
t
h
i
nt
e
ge
r
va
l
ue
s
r
a
ngi
ng f
r
om
1
t
o 26.
A
n e
xa
m
pl
e
of
i
t
s
a
ppl
i
c
a
t
i
on i
s
s
how
n
i
n T
a
bl
e
1.
T
a
bl
e
2,
i
t
s
how
s
t
he
r
e
s
ul
t
s
of
s
e
l
e
c
t
i
ng i
nt
e
ge
r
va
l
ue
s
f
or
num
e
r
i
c
va
l
ue
s
s
t
a
r
t
i
ng
f
r
om
0 t
o 9
a
nd on
e
f
or
t
he
s
pa
c
e
c
ha
r
a
c
t
e
r
.
T
hi
s
s
t
a
ge
w
i
l
l
be
us
e
d
i
n
t
he
ne
xt
pr
oc
e
s
s
,
na
m
e
l
y
t
he
e
nc
r
ypt
i
on a
nd
de
c
r
ypt
i
on
pr
oc
e
s
s
us
i
ng a
s
ym
m
e
t
r
i
c
ke
y.
T
ab
l
e 1
.
D
e
te
r
min
a
tio
n
o
f
t
he
i
nt
e
ge
r
va
l
ue
f
or
t
he
a
l
pha
be
t
(
s
t
r
i
ng)
P
la
in
te
x
t
S
tr
in
g
A
B
C
D
E
F
G
H
I
J
K
L
M
In
t
e
g
e
r
1
2
3
4
5
6
7
8
9
10
11
12
13
S
tr
in
g
N
0
P
Q
R
S
T
U
V
W
X
Y
Z
In
t
e
g
e
r
14
15
16
17
18
19
20
21
22
23
24
25
26
T
a
bl
e
2.
D
e
t
e
r
m
i
na
t
i
on o
f
i
nt
e
ge
r
va
l
ue
s
f
or
num
e
r
i
c
s
P
la
in
te
x
t
N
u
me
r
ic
0
1
2
3
4
5
6
7
8
9
S
p
ace
I
nt
e
ge
r
27
28
29
30
31
32
33
34
35
36
37
3.
2.
P
l
ai
n
t
e
xt
f
or
te
s
ti
n
g
s
a
mp
l
e
s
T
he
m
e
s
s
a
ge
us
e
d a
s
a
s
a
m
pl
e
f
or
t
he
i
m
pl
e
m
e
nt
a
t
i
on of
c
r
ypt
og
r
a
phy
i
n
e
-
b
u
si
n
e
s
s sy
st
e
m
s
c
om
bi
ne
s
t
w
o t
ype
s
of
ke
ys
,
na
m
e
l
y s
ym
m
e
t
r
i
c
a
nd a
s
ym
m
e
t
r
i
c
.
F
or
s
ym
m
e
t
r
i
c
ke
ys
us
i
ng
s
i
m
pl
e
ke
ys
w
h
ile
a
s
y
mme
tr
ic
k
e
y
s
a
p
p
ly
th
e
R
S
A
a
lg
o
r
ith
m.
T
r
ia
l
s
a
mp
le
te
x
t
me
s
s
a
g
e
s
e
c
u
r
ity
u
s
in
g
"
S
I
M
P
L
E
"
s
h
o
w
n
i
n
T
ab
l
e 3
.
T
he
pr
oc
e
s
s
of
e
nc
r
ypt
i
ng m
e
s
s
a
ge
s
s
e
nt
by t
he
s
e
nde
r
be
gi
ns
by de
t
e
r
m
i
n
i
ng t
he
i
nt
e
g
e
r
va
l
ue
f
o
r
t
h
e s
am
p
l
e
m
es
s
ag
e t
o
b
e u
s
ed
b
as
ed
o
n
t
h
e
r
ef
er
en
ces
f
r
o
m
T
ab
l
e
1
.
T
h
e n
ex
t
s
t
ep
i
s
t
o
cr
eat
e a s
i
m
p
l
e
s
ym
m
e
t
r
i
c
ke
y a
nd a
n a
s
ym
m
e
t
r
i
c
ke
y us
i
ng t
he
R
S
A
a
l
gor
i
t
hm
.
Evaluation Warning : The document was created with Spire.PDF for Python.
T
E
L
KOM
NI
KA
T
el
eco
m
m
u
n
C
om
put
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l
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ont
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m
p
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o
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en
t
s
ecu
r
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y i
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bus
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t
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m
s
us
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ng hy
br
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d al
gor
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(
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Sum
ar
y
ant
i
)
1539
T
a
bl
e
3.
S
a
m
pl
e
m
e
s
s
a
ge
s
f
or
t
he
a
ppl
i
c
a
t
i
on of
t
h
e
hybr
i
d a
l
go
r
i
t
hm
P
la
in
te
x
t
S
tr
in
g
S
I
M
P
L
E
I
nt
e
ge
r
19
9
13
16
12
5
3.
3.
P
rep
a
ra
t
i
o
n
o
f
s
i
m
p
l
e
s
y
m
m
et
ri
c k
ey
T
he
s
t
e
ps
t
o ge
ne
r
a
t
e
t
hi
s
ke
y
a
r
e
de
s
c
r
i
be
d i
n
t
he
f
ol
l
ow
i
ng s
t
e
ps
:
−
C
hoos
e
a
r
a
ndom
i
nt
e
ge
r
,
a
s
s
um
e
n=
5
.
−
F
i
nd t
he
i
nve
r
s
e
of
n
by
a
ppl
yi
ng t
he
m
od
37
op
e
r
a
t
i
on,
s
o
t
ha
t
n
-
1
=
15 i
s
obt
a
i
ne
d,
ve
r
i
f
y
t
he
i
n
ve
r
s
e
r
e
s
ul
t
by m
ul
t
i
pl
y
i
ng t
w
o
num
be
r
s
,
t
he
n
m
od 37
.
(
5x15 m
od 37=
1)
,
t
he
n
t
he
f
i
r
s
t
ke
y
(
k)
=
15.
−
A
ga
i
n c
hoos
i
ng a
r
a
ndom
ne
ga
t
i
ve
n
u
m
b
er
,
as
s
u
m
e n
a
=
-
3
.
−
F
i
nd t
he
i
nve
r
s
e
of
n
a
=
-
3 w
i
t
h m
od 37 ope
r
a
t
i
on,
ge
t
t
he
va
l
ue
of
na
-
1
=
12,
ve
r
i
f
y
(
-
3x12 m
od 37=
1)
,
t
he
n
t
he
s
e
c
ond ke
y k
1
=
12.
R
e
s
ul
t
of
t
he
e
nc
r
ypt
i
on
pr
oc
e
s
s
us
i
ng s
i
m
pl
e
s
ym
m
e
t
r
i
c
ke
y a
l
gor
i
t
hm
s
a
r
e
s
how
n i
n
T
a
bl
e
4
.
T
a
bl
e
4.
E
nc
r
ypt
i
on
u
s
in
g
s
y
mme
tr
ic
ke
y a
l
gor
i
t
h
m
P
la
in
te
x
t
In
t
e
g
e
r (I)
C
1
= (
I
*n)
m
od 37
C
2
=
(C
1
*n
1
)
m
od 37
C
hi
pe
r
t
e
xt
S
19
21
11
K
I
9
8
13
M
M
13
28
27
0
P
16
6
19
S
L
12
23
5
E
E
5
25
36
9
3.
4
.
G
en
era
t
e
k
e
y
s
RS
A
al
gor
i
t
h
m
−
C
hoos
e
a
pr
i
m
e
num
be
r
p=
5
a
nd
q=
11,
p≠
q
t
e
r
m
s
.
−
C
a
l
c
ul
a
t
i
ng t
he
va
l
ue
of
n=
(
5x11=
55)
−
C
al
cu
l
at
e t
h
e v
al
u
e o
f
m
=(
5
-
1)
x
(
11
-
1)
=
40
−
C
hoos
e
t
he
i
nt
e
ge
r
e
=
3 c
ondi
t
i
on 1
<
e
<
m
−
C
om
put
e
d
t
o
s
a
t
i
s
f
y t
he
c
ongr
ue
nc
e
r
e
l
a
t
i
ons
hi
p 3×
27=
1
m
od
40;
s
o t
ha
t
t
he
va
l
ue
of
d=
27,
m
ak
e i
t
a
p
r
i
v
at
e k
ey
−
D
e
t
e
r
m
i
na
t
i
on of
t
he
publ
i
c
ke
y
,
na
m
e
l
y
e
,
n=
(
3,
5
5)
a
nd t
he
pr
i
va
t
e
ke
y
,
na
m
e
l
y n
,
d=
(
55,
27)
.
T
he
r
e
s
ul
t
s
of
t
he
e
nc
r
ypt
i
on
ke
y a
ppl
i
c
a
t
i
on us
i
ng
t
he
R
S
A
a
l
gor
i
t
hm
a
r
e
s
how
n i
n
T
a
bl
e
5.
T
a
bl
e
5.
R
e
s
ul
t
s
of
t
he
R
S
A
e
nc
r
yp
t
i
on a
l
go
r
it
h
m
C
h
ip
e
r
te
x
t S
y
mme
tr
ic
K
e
y
In
t
e
g
e
r (P
)
C=
P
3
m
od 55
C
hi
pe
r
t
e
xt
K
11
(
11)
3
m
od 55
11
M
13
(
13)
3
m
od 55
52
0
27
(
27)
3
m
od 55
48
S
19
(
19)
3
m
od 55
39
E
5
(5
)
3
m
od 55
15
9
36
(
36)
3
m
od 55
16
3.
5.
E
n
cry
p
t
i
o
n
us
i
ng
t
he
R
SA
al
gor
i
t
h
m
R
S
A
a
l
gor
i
t
hm
e
nc
r
ypt
i
on p
r
oc
e
s
s
ba
s
e
d on t
he
ke
y t
ha
t
ha
s
be
e
n c
r
e
a
t
e
d,
na
m
e
l
y:
C
=
P
e
m
od
n,
ba
s
e
d on t
he
pr
e
vi
ous
s
t
a
ge
s
i
s
know
n
t
he
va
l
ue
o
f
e
=
3,
a
nd
n=
55.
T
he
m
e
s
s
a
ge
i
s
us
e
d
f
or
e
nc
r
ypt
i
on us
i
ng
s
ym
m
e
t
r
i
c
ke
y e
nc
r
ypt
i
on
r
e
s
ul
t
s
i
n T
a
bl
e
4
.
R
e
s
ul
t
s
of
t
he
R
S
A
e
nc
r
ypt
i
on
a
l
gor
i
t
hm
,
s
how
n i
n
T
ab
l
e 5
.
3.
6.
Hy
b
r
id
al
gor
i
t
h
m
d
e
c
r
yp
t
i
on
T
he
de
c
r
ypt
i
on pr
oc
e
s
s
us
i
ng a
hybr
i
d a
l
gor
i
t
hm
i
s
c
a
r
r
i
e
d out
by t
r
a
ns
l
a
t
i
ng a
s
a
m
pl
e
m
e
s
s
a
ge
,
na
m
e
l
y "
K
M
0S
E
9"
,
by
c
om
bi
ni
ng
t
he
R
S
A
a
nd
s
ym
m
e
t
r
i
c
a
l
gor
i
t
hm
s
,
s
o
t
ha
t
a
pl
ai
n
t
ex
t
m
es
s
ag
e can
b
e
obt
a
i
ne
d t
ha
t
c
a
n be
a
c
c
e
s
s
e
d by t
he
r
e
c
i
pi
e
nt
.
T
he
w
or
ki
ng s
t
e
ps
of
t
he
hybr
i
d a
l
gor
i
t
hm
t
o c
a
r
r
y out
t
he
de
c
r
ypt
i
on pr
oc
e
s
s
a
r
e
de
s
c
r
i
be
d a
s
f
ol
l
ow
s
;
3.
6.
1.
D
ecry
p
t
i
o
n
us
i
ng
RS
A
E
nc
r
ypt
i
on
r
e
s
ul
t
s
o
f
t
he
m
e
s
s
a
ge
s
a
m
pl
e
"
K
M
0S
E
9"
i
n
T
a
bl
e
5
,
a
r
e
us
e
d
f
or
t
he
de
s
c
r
i
pt
i
on
pr
oc
e
s
s
by a
ppl
yi
ng t
he
R
S
A
a
l
gor
i
t
h
m
.
T
he
s
t
e
ps
t
a
ke
n t
o
pr
oduc
e
t
he
t
r
a
ns
l
a
t
i
on
of
t
he
de
c
r
ypt
e
d
m
e
s
s
a
g
e
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SSN
:
1693
-
6930
T
E
L
KOM
NI
KA
T
el
eco
m
m
u
n
C
om
put
E
l
C
ont
r
o
l
,
Vo
l
.
19
, N
o
.
5
,
O
c
t
obe
r
2021:
1535
-
1543
1540
a
r
e
us
i
ng t
he
e
qua
t
i
on P
=
C
d
m
od n.
R
e
s
ul
t
s
of
m
e
s
s
a
ge
de
c
r
ypt
i
on us
i
ng R
S
A
a
r
e
s
how
n i
n
T
a
bl
e
6,
a
s
s
um
i
ng t
he
va
l
ue
s
of
d=
27 a
nd n=
55
.
T
a
bl
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0
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m
od 55
19
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15
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od 55
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9
3.
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m
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a
t
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a
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t
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ur
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phy
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t
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35]
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4.
CO
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R
EF
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EN
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ES
[1
]
L
.
S
um
a
r
ya
nti,
L
.
L
a
m
a
le
wa
,
a
nd T.
I
sta
n
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m
ple
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on of
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uz
z
y M
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lt
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r
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l
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e
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,
”
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nt.
J
.
Me
c
h.
E
ng.
T
e
c
hn
ol.
,
vo
l.
10,
n
o.
3,
pp.
2
36
-
2
4
3,
20
19.
[2
]
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.
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ya
nti,
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K.
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a
ha
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yi
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o,
a
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pa
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or
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S
ys
te
m
,
”
in
I
O
P C
on
fe
re
nc
e
Se
rie
s:
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ar
th
an
d E
nv
i
ro
nme
nta
l
Sc
ie
nc
e
,
20
19,
p
p.
1
-
5,
d
oi
: 10.
1
08
8/
17
55
-
1
31
5/
34
3/
1/
0
122
07.
[3
]
C
.
T.
S
he
ung,
“
E
-
B
us
ine
ss
; The
Ne
w S
tr
a
te
g
ie
s A
nde
-
B
usi
ne
s
s
Et
hic
s,
tha
t
L
e
a
ds
Or
ga
n
iz
a
t
io
ns
t
o
S
uc
c
e
ss,
”
Glo
b
.
J
.
Man
ag.
B
us.
Re
s.
A Ad
m.
Ma
na
g.
,
vo
l.
14,
n
o.
8,
pp.
8
-
1
4,
20
14.
[4
]
R
.
Č
ia
r
ni
e
nė
a
nd
G
.
S
ta
n
ke
v
ič
i
ūtė
,
“
The
o
r
e
t
ic
a
l
F
r
a
m
e
wor
k of
E
-
B
us
ine
ss C
om
pe
ti
ti
ve
ne
ss,
”
Pr
oc
e
d
ia
S
oc
.
Be
hav
.
Sc
i.
,
vo
l.
21
3,
pp.
7
34
-
73
9,
20
15,
d
oi
:
1
0.
10
16
/j.
sb
spr
o.
201
5.
1
1.
52
8.
[5
]
B
.
R
ondov
ić
,
T.
Djur
ič
k
ov
ić
,
a
nd
L
.
Ka
šć
e
la
n,
“
Dr
i
ve
r
s
of
e
-
bu
si
ne
s
s dif
f
u
si
on i
n tour
ism
: A de
c
i
si
on tr
e
e
a
p
p
r
o
a
c
h
,
”
J
.
T
he
or.
A
pp
l.
Ele
c
tr
on.
C
o
mme
r.
Re
s.
,
vol.
14,
n
o.
1,
pp.
30
-
50,
2
01
9,
do
i:
1
0.
4
06
7/S
07
18
-
187
62
01
90
00
10
01
04.
[6
]
S
.
M
.
S
he
ikh a
nd M
.
B
a
s
t
i,
“
C
us
tom
e
r
S
a
t
isf
a
c
ti
on i
n
B
usi
ne
s
s t
o C
on
sum
e
r
(
B
2C
)
E
-
c
om
m
e
r
c
e
: A C
om
pa
r
a
tiv
e
S
tud
y of
Tur
ke
y a
n
d P
a
ki
sta
n,
”
Eu
ra
si
an J
.
Bus.
Ec
o
n.
,
vol.
8,
no.
16,
pp.
7
3
-
1
00,
201
5
,
doi
: 1
0.
17
01
5/
e
j
be
.
20
15.
01
6.
05.
[7
]
R
.
Ta
m
ila
r
a
s
i a
n
d N.
Ela
m
a
th
i,
“
E
-
Co
mmerce Bu
s
i
ne
s
s Te
c
h
no
lo
gy S
oc
ie
t
y,
”
I
nt.
J
.
En
g.
T
e
c
hn
ol.
M
an
ag.
R
e
s.
,
vol.
4,
p
p.
33
-
4
1,
20
17,
d
oi :
10.
5
28
1/z
e
no
do.
10
42
45
6.
[8
]
D.
P
.
,
S
.
S
.
B
a
bu,
a
nd
Y.
Vi
ja
ya
la
k
shm
i,
“
En
ha
nc
e
m
e
nt
of
e
-
c
om
m
e
r
c
e
se
c
ur
i
ty
thr
ou
gh
a
s
ym
m
e
tr
ic
ke
y
a
lg
or
i
thm
,
”
C
o
mp
ut.
C
o
mm
un.
,
vo
l.
15
3,
no.
M
a
y 20
19,
pp.
12
5
-
13
4,
20
20,
d
oi
:
10.
10
16
/j.
c
om
c
om
.
2
02
0.
01.
03
3.
[9
]
A.
H.
M
.
S
obih
a
h,
A.
M
.
B
.
M
.
S
a
lle
h Em
ba
t,
W.
A.
A.
B
.
W.
M
ohd Am
in,
a
nd M
.
S
.
M
uda
,
“
The
R
e
la
ti
on
shi
p
b
e
t
w
e
e
n
E
-
C
om
m
e
r
c
e
Ad
op
ti
on a
nd Or
ga
n
iz
a
t
io
n P
e
r
f
o
r
m
a
nc
e
,
”
I
nt.
J
.
Bus.
M
an
ag
.
,
vo
l.
9,
no.
1,
pp.
5
6
-
6
2,
20
13,
doi
: 1
0.
55
39
/i
jbm
.
v9
n1
p5
6.
[
10]
Z
.
H.
A.
Alm
t
ir
i a
nd S
.
J.
M
ia
h,
“
I
m
p
a
c
t
of
E
-
C
om
m
e
nc
e
Te
c
hn
ol
og
y A
do
pt
io
n i
n D
uba
i S
M
E
s,
”
C
o
n
f
e
r
e
n
c
e
:
I
EE
E C
SD
E C
o
nfe
re
nc
e
At:
Me
lb
ou
rne
,
A
us
tr
al
ia
,
20
20
,
pp.
1
-
8
,
do
i:
1
0.
11
09
/C
S
D
E4
82
74.
2
0
19
.
91
62
35
8
.
[
11]
M
.
I
.
S
e
tia
wa
n
e
t a
l.
, “
E
-
B
u
si
ne
s
s,
Air
por
t De
ve
l
op
m
e
nt a
n
d I
t
s I
m
pa
c
t o
n t
he
I
nc
r
e
a
si
ng
of
I
nf
or
m
a
t
io
n o
f
C
om
m
un
ic
a
ti
on De
ve
l
opm
e
nt
in I
nd
one
sia
,
”
J
.
Phy
s.
C
onf.
Se
r.
,
vo
l.
10
07,
n
o.
1,
20
18,
d
oi
:
10
.
1
08
8/
174
2
-
659
6/
10
07
/1
/0
12
04
6
.
[
12]
Y.
L
i a
nd J.
L
i,
“
R
isk M
a
na
ge
m
e
n
t of
E
-
c
om
m
e
r
c
e
S
e
c
ur
i
ty i
n C
lo
ud C
om
pu
ti
ng
En
vir
onm
e
nt,
”
P
roc
.
-
20
20 12t
h
I
nt.
C
on
f.
Me
as.
T
e
c
hn
ol.
Me
c
h
at
ro
nic
s Au
to
m.
I
C
MT
MA 20
20
,
20
20,
p
p.
787
-
79
0
,
doi
: 1
0.
11
09
/I
C
M
TM
A5
02
54.
20
20.
0
01
72.
[
13]
R
.
S
uwa
nd
i,
S
.
M
.
Na
suti
on,
a
n
d
F
.
A
z
m
i
,
“
S
e
c
u
r
e
E
-
v
oti
ng
sS
ys
te
m
b
y Ut
il
iz
i
ng H
om
om
or
p
hic
P
r
o
pe
r
t
ie
s of
The
Enc
r
yp
ti
on Al
gor
it
hm
,
”
T
E
L
KO
M
NIKA
T
e
le
c
o
mm
un
ic
ati
on,
C
om
pu
ti
ng,
Ele
c
tr
on
ic
s an
d
C
o
nt
ro
l
,
vo
l.
1
6,
no
.
2,
pp.
86
2
-
86
7,
20
18,
d
oi
: 10.
12
92
8/
TEL
K
OM
NI
KA.
v
16
i
2.
84
20.
[
14]
N.
Ar
gy
r
op
ou
lo
s,
H.
M
our
a
ti
di
s,
a
nd A.
F
i
sh,
“
A
ttr
ib
u
te
-
ba
se
d se
c
ur
i
ty ve
r
if
ic
a
t
io
n of
bu
si
ne
s
s pr
oc
e
s
s m
ode
ls,
”
Pro
c
.
-
201
7 I
E
EE 1
9t
h C
o
nf.
B
us.
I
n
fo
rm
at
ic
s,
C
BI
2
01
7
,
vol.
1,
2
01
7,
pp.
4
3
-
52
,
d
oi
:
10.
11
09
/C
B
I
.
20
17.
3
7.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SSN
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T
E
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u
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put
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l
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.
19
, N
o
.
5
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r
2021:
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1542
[
15]
R
.
I
.
F
a
dy,
“
Eva
lua
te
t
he
e
-
bu
si
ne
s
s
m
a
t
ur
i
ty of
the
p
or
t of
Ale
xa
n
dr
ia
,
”
Pr
oc
.
An
nu.
Haw
ai
i I
n
t.
C
on
f.
Sy
s
t.
S
c
i.
,
201
3,
pp.
3
88
8
-
38
99
,
do
i:
10.
11
09
/HI
C
S
S
.
2
01
3.
20
7.
[
16]
H.
L
ia
o,
L.
Li
,
J.
Xua
n
a
nd
H.
Wa
ng,
“
Ap
pl
ic
a
t
io
n of
C
r
ypt
og
r
a
p
hic
Te
c
h
no
lo
gy B
a
se
d on C
e
r
tif
ic
a
te
le
s
s S
ys
te
m
in
E
le
c
tr
ic
i
ty I
nte
r
ne
t
of
Th
in
gs,
”
i
n
I
n
te
r
na
ti
on
al
C
o
n
fe
re
nc
e
on
Adv
anc
e
d
E
le
c
t
ro
nic
M
ate
ri
al
s,
C
om
pu
te
r
an
d
Sof
tw
a
re
E
ng
ine
e
ri
ng (
AE
MC
S
E)
,
20
20,
p
p.
41
7
-
4
23,
d
oi: 10.
1
10
9/
A
EM
C
S
E5
09
48.
20
20.
0
00
97.
[
17]
Z
.
M
ing,
H.
L
v,
A.
Xu,
a
nd
H.
Ya
n
g,
“
E
xp
lor
in
g C
om
pu
te
r
I
n
f
or
m
a
ti
on S
e
c
ur
i
ty T
e
c
h
no
lo
gy a
n
d P
r
o
te
c
t
io
n
M
e
th
ods,
”
in
P
roc
e
e
di
ng
s
-
2
01
9 I
n
te
r
na
ti
on
al C
on
fe
re
n
c
e
on C
o
mm
un
ic
a
ti
on
s,
I
nf
or
ma
ti
on
Sy
s
te
m,
a
nd C
o
mp
ute
r
En
gi
ne
e
r
in
g,
C
I
SC
E 2
01
9
, 2
0
19,
p
p.
42
5
-
4
27,
d
oi
:
1
0.
1
109
/C
I
S
C
E.
20
19.
0
01
00.
[
18]
H.
Te
ym
our
lo
ue
i a
n
d V.
Ha
r
r
is,
“
Ef
f
e
c
ti
ve
M
e
t
ho
ds t
o
M
oni
tor
I
T I
nf
r
a
str
uc
t
ur
e
S
e
c
ur
i
ty f
or
S
m
a
l
l B
us
ine
ss,
”
in
C
onf
e
re
nc
e
on
C
om
pu
ta
ti
on
al
Sc
ie
nc
e
a
nd
C
o
m
put
at
io
na
l
I
n
te
l
li
ge
nc
e
,
C
SC
I
20
19
,
20
19,
p
p.
7
-
13,
doi
: 1
0.
11
09
/C
S
C
I
4
93
70.
20
19.
0
00
09.
[
19]
C
.
A.
S
a
r
i,
G
.
Ar
dia
ns
ya
h,
D.
R
.
I
.
M
ose
s S
e
t
ia
d
i,
a
nd
E.
H.
R
a
c
hm
a
wa
nt
o,
“
An I
m
pr
o
ve
d S
e
c
ur
i
ty a
n
d M
e
s
s
a
ge
C
a
pa
c
i
ty
us
in
g A
ES
a
n
d H
uf
f
m
a
n
C
o
di
ng
on I
m
a
ge
S
te
g
a
no
gr
a
p
hy,
”
T
EL
K
OMN
I
K
A T
e
l
e
c
o
mm
un
ic
a
ti
on,
C
o
mp
ut
i
ng
,
Ele
c
tr
on
ic
s a
nd C
on
tr
ol,
v
ol.
1
7,
no.
5,
p
p.
24
00
-
24
09,
2
01
9,
doi
: 1
0.
12
92
8/
T
EL
KOM
NI
K
A.
v1
7i
5.
9
57
0.
[
20]
S
.
D.
P
utr
a
,
M
.
Yu
dh
ipr
a
wir
a
,
S
.
S
u
ti
kn
o,
Y.
Kur
nia
wa
n,
a
nd A.
S
.
A
hm
a
d,
“
P
o
we
r
A
na
l
ys
is
At
ta
c
k
Aga
in
st
Enc
r
yp
t
io
n
de
v
ic
e
s
: A C
om
pr
e
he
n
si
ve
Ana
ly
si
s o
f
A
ES
,
DES
,
a
nd B
C
3,
”
T
EL
K
O
MN
I
K
A T
e
le
c
o
mm
un
ic
a
ti
on,
C
om
pu
t
ing
,
Ele
c
tr
on
ic
s a
nd C
on
tr
ol,
v
ol.
1
7,
no.
3,
p
p
.
12
82
-
12
89,
2
01
9,
doi
: 1
0.
12
92
8/
T
EL
KOM
NI
K
A.
V1
7I
3.
93
84.
[
21]
A.
Abi
d,
M
.
Ala
ba
ic
h
i,
A
.
Abba
s
a
n
d
S
.
,
“
Dua
l M
e
th
od C
r
y
pt
ogr
a
ph
y
I
m
a
ge
by
2F
S
a
nd
S
te
ga
n
ogr
a
ph
y S
e
c
r
e
t
M
e
ssa
ge
in I
n
te
r
ne
t of
Th
in
gs (
I
oT )
,
”
T
EL
K
O
MN
I
K
A
T
e
le
c
om
mu
nic
at
io
n,
C
omp
ut
in
g,
Ele
c
tr
on
ic
s a
nd C
o
nt
rol
,
vol.
1
8,
no.
1,
p
p.
29
28
-
2
93
8,
20
20,
d
oi
: 10.
12
92
8/
TEL
KOM
N
I
K
A.
v1
8i
6.
1
58
47.
[
22]
S
.
Za
ine
lde
e
n a
n
d A.
Ate
,
“
I
m
pr
ove
t
he
S
e
c
ur
i
ty of
Tr
a
nsf
e
r
Da
ta
F
ile
o
n the
C
l
ou
d by E
xe
c
u
ti
ng H
y
br
i
d
Enc
r
yp
ti
on Al
gor
it
hm
s,
”
I
nd
on
e
s.
J
.
Ele
c
tr.
En
g.
C
ompu
t.
Sc
i.
,
vol.
20,
no.
1,
pp.
52
1
-
5
27,
2
020,
doi
: 1
0.
11
59
1/
ij
e
e
c
s.
v
20.
i1.
p
p5
21
-
52
7.
[
23]
K.
Va
sa
vi a
n
d Y
.
M
.
L
a
tha
,
“
R
S
A c
r
y
pt
ogr
a
ph
y
ba
se
d m
ul
ti
-
m
oda
l bi
om
e
tr
ic
i
de
n
tif
ic
a
t
io
n s
ys
te
m
f
or
hig
h
-
s
e
c
ur
it
y a
pp
lic
a
ti
on,
”
I
n
t.
J
.
I
nte
l
l.
En
g.
Sy
s
t.
,
vo
l.
12,
no.
1,
pp.
1
0
-
21,
2
01
9,
do
i: 1
0.
2
22
66/
I
JI
ES
20
19.
02
28.
0
2.
[
24]
I
.
Ja
ha
n,
M
.
Asif
,
a
nd L
.
Jude
R
oz
a
r
i
o,
“
I
m
pr
ove
d R
S
A
C
r
ypto
sy
ste
m
B
a
se
d on The
S
t
ud
y of
Num
be
r
T
he
or
y a
nd
P
ubl
ic
Ke
y C
r
y
pt
os
yst
e
m
s,
”
A
m.
J
.
Eng.
Re
s.
,
vol.
4,
n
o.
1,
pp.
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20
-
84
7,
20
15.
[
25]
N.
Ta
ha
t,
A.
A.
Ta
ha
t,
M
.
Ab
u
-
da
lu,
a
n
d R
.
B
.
Alba
da
r
ne
h,
“
A Ne
w R
S
A P
u
bl
ic
Ke
y Enc
r
yp
ti
on S
c
he
m
e
Wi
th C
ha
oti
c
Map
s
,
”
I
n
t.
J
.
Ele
c
t
r.
C
om
pu
t.
En
g.
,
vol.
1
0,
no.
2,
p
p.
14
30
-
14
37,
2
02
0,
do
i: 1
0.
1
15
91
/ij
e
c
e
.
v1
0i
2.
p
p1
43
0
-
14
37
.
[
26]
J
.
M
a
z
a
r
i
r
e
a
n
d
C
.
K
w
e
n
d
a
,
“
Hy
br
i
d Al
gor
it
hm
f
or
E
-
c
o
m
m
e
r
c
e
A
p
p
l
i
c
a
t
i
o
n
s
,
”
I
n
t.
J
.
Re
s.
I
T
Ma
na
g.
,
vol.
6,
no.
1,
pp.
4
0
-
48,
2
01
6.
[
27]
N.
A.
Ka
ko,
H.
T.
S
a
de
e
q,
a
nd A.
R
.
Abr
a
him
,
“
Ne
w S
ym
m
e
tr
ic
Ke
y C
ip
he
r
C
a
pa
b
le
of
Digr
a
ph t
o S
in
gle
L
e
tte
r
C
onv
e
r
s
io
n U
ti
liz
in
g B
i
na
r
y
S
y
ste
m
,
”
In
d
one
s.
J
.
E
le
c
t
r.
En
g.
C
o
mp
ut.
Sc
i.
,
vo
l.
18,
no.
2,
p
p.
1
02
8
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10
34
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202
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,
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11
59
1/
ij
e
e
c
s.
v
18.
i2.
p
p1
02
8
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10
34
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[
28]
C
.
S
c
ie
nc
e
,
A.
I
nf
o,
S
.
R
.
M
.
Z
e
e
ba
r
e
e
,
a
nd I
.
Te
c
hn
ol
og
y,
“
DES
Enc
r
y
pt
io
n a
nd
De
c
r
yp
ti
on Al
gor
it
hm
I
m
ple
m
e
nta
ti
on B
a
se
d
on
F
P
G
A,
”
I
nd
on
e
s.
J
.
E
le
c
t
r.
En
g.
C
o
mp
ut.
Sc
i.
,
v
ol.
18,
n
o.
2,
pp.
77
4
-
7
81,
20
20,
doi
: 1
0.
11
59
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ij
e
e
c
s.
v
18.
i2.
p
p7
74
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78
1.
[
29]
H
.
V.
G
a
m
id
o,
A
.
M
.
S
is
on,
a
nd
R
.
P
.
M
e
d
ina
,
“
M
od
if
i
e
d A
ES
f
or
Te
x
t a
n
d I
m
a
ge
Enc
r
y
pti
on,
”
I
nd
one
s.
J
.
El
e
c
tr.
En
g.
C
omp
ut.
S
c
i.
,
vo
l.
11,
n
o.
3,
pp.
9
42
-
94
8,
20
18,
d
oi
: 10.
1
15
91
/ i
je
e
c
s.
v1
1.
i3.
pp
94
2
-
9
48.
[
30]
P
. S
.
S
a
nka
r
a
n a
n
d V.
B
.
Kir
uba
na
nd,
“
H
ybr
id c
r
yp
to
gr
a
p
hy se
c
ur
i
ty
in
pu
bl
ic
c
l
ou
d u
si
ng
Tw
oF
i
sh a
n
d E
C
C
a
lg
or
i
thm
,
”
I
n
t.
J
.
Ele
c
t
r.
C
om
pu
t.
En
g.
,
vol.
9,
n
o.
4,
pp
.
2578
-
2
58
4,
20
19,
d
o
i
:
10.
11
59
1/
ije
c
e
.
v
9i
4.
p
p2
57
8
-
25
84
.
[
31]
B
.
M
ur
uga
na
nt
ha
m
,
P
.
S
ha
m
ili,
S
.
G.
Kum
a
r
,
a
nd A.
M
u
r
uga
n,
“
Qua
n
tum
C
r
y
pt
ogr
a
ph
y f
or
S
e
c
ur
e
d C
om
m
u
nic
a
t
io
n
Ne
t
wor
ks,
”
I
n
t.
J
.
Ele
c
t
r.
C
om
pu
t.
En
g.
,
vol.
1
0,
no.
1,
p
p.
407
-
4
14,
2
02
0,
do
i: 1
0.
1
15
91
/ij
e
c
e
.
v1
0i
1.
p
p4
07
-
41
4.
[
32]
K.
S
u
r
e
sh
,
P
.
P
.
R
e
ddy
,
a
nd
P
.
P
r
e
e
thi,
“
A
Nove
l
K
e
y Ex
c
ha
nge
Algor
ith
m
f
o
r
S
e
c
u
r
ity
in
I
nt
e
r
n
e
t
of
Thin
gs,
”
I
ndone
s
.
J
.
El
e
c
tr
.
Eng
.
C
omput
.
S
c
i
.
,
vol
.
16,
no
.
3,
pp
.
1
515
-
1520,
2019
,
doi:
10
.
11591/ije
e
c
s
.
v16
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i3
.
pp1515
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1520
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[
33]
J.
I
.
Ahm
a
d,
R
.
Din,
M
.
Ahm
a
d,
a
nd
J.
I
.
Ahm
a
d,
“
A
na
l
ys
is R
e
v
ie
w o
n
P
u
bl
ic
Ke
y C
r
yp
to
gr
a
p
hy
A
lg
or
i
th
m
s,
”
I
nd
one
s.
J
.
Ele
c
t
r.
En
g.
C
om
pu
t.
Sc
i.
,
vo
l.
12,
n
o.
2,
pp.
447
-
4
54,
2
01
8,
do
i: 1
0.
1
15
91
/i
je
e
c
s.
v
12.
i2.
p
p4
47
-
45
4.
[
34]
A.
E.
Om
ola
r
a
a
nd
A.
Ja
nta
n,
“
M
o
dif
ie
d
Ho
ne
y
Enc
r
y
pt
ion
S
c
he
m
e
f
or
E
nc
o
di
ng
Na
tur
a
l L
a
ng
ua
ge
M
e
ssa
ge
,
”
I
nt.
J
.
Ele
c
t
r.
C
om
pu
t.
En
g.
,
vol.
9,
n
o.
3,
pp.
1
87
1
-
1
87
8,
20
19,
do
i: 10.
1
15
91
/i
je
c
e
.
v
9i
3.
p
p1
87
1
-
18
78
.
[
35]
B
.
T.
Ha
m
m
a
d,
A.
M
.
S
a
ghe
e
r
,
I
.
T.
A
hm
e
d,
a
nd
N.
Ja
m
il,
“
A
C
om
pa
r
a
t
ive
R
e
v
ie
w
o
n
S
ym
m
e
tr
ic
a
n
d
As
ym
m
e
t
r
ic
D
NA
-
B
a
se
d
C
r
yp
to
gr
a
p
hy,
”
B
ul
l.
Ele
c
tr.
En
g.
I
nf
or
mat
ic
s
,
vol.
9,
n
o.
6,
pp.
24
84
-
24
91,
2
0
20,
doi
: 1
0.
11
59
1/
e
e
i.
v
9i
6.
2
47
0.
[
36]
F
.
Q.
A.
Al
-
y
ou
suf
a
n
d R
.
Di
n,
“
R
e
vie
w o
n S
e
c
ur
e
d Da
ta
C
a
p
a
b
il
it
ie
s of
C
r
yp
to
gr
a
p
hy,
S
te
ga
n
ogr
a
ph
y
a
nd
W
a
te
r
m
a
r
ki
ng D
om
a
i
n,
”
I
nd
one
s.
J
.
Ele
c
tr.
En
g.
C
omp
ut.
Sc
i.
,
vol.
1
7,
no.
2,
pp.
10
53
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10
59,
2
0
20,
doi
: 1
0.
11
59
1/
ij
e
e
c
s.
v
17.
i2.
p
p1
05
3
-
10
59
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[
37]
A.
Y.
U.
P
yr
k
ov
a
a
nd Z
.
H.
E.
Te
m
ir
be
ko
va
,
“
C
om
pa
r
e
Enc
r
yp
ti
on P
e
r
f
or
m
a
nc
e
Ac
r
os
s
De
vic
e
s t
o
E
ns
ur
e
The
S
e
c
ur
i
ty of
T
he
I
oT,
”
I
n
do
ne
s.
J
.
Ele
c
tr.
E
ng.
C
omp
ut.
Sc
i.
,
vol.
20,
n
o.
2,
pp.
89
4
-
90
2,
2020
,
doi
: 1
0.
11
59
1/
ij
e
e
c
s.
v
20.
i2.
p
p 8
94
-
90
2.
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