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n
ts
u
s
e
th
eir
k
e
y
s
i
n
d
ep
en
d
en
tl
y
(
b
u
t
t
h
e
p
r
o
to
co
l
ca
ll
f
o
r
th
e
s
e
n
d
er
an
d
r
ec
eiv
er
to
h
a
v
e
t
w
o
p
r
i
v
a
te
k
e
y
s
f
o
r
en
cr
y
p
ti
n
g
a
n
d
d
ec
r
y
p
ti
n
g
m
es
s
ag
e
s
)
.
T
h
e
s
y
s
te
m
s
o
f
th
r
ee
p
ass
p
r
o
to
co
l a
s
s
h
o
w
n
i
n
Fi
g
u
r
e
2
[
1
]
.
Fig
u
r
e
1
.
Flo
w
c
h
ar
t o
f
th
r
ee
p
ass
p
r
o
to
co
l
Fig
u
r
e
2
.
T
h
e
s
y
s
te
m
o
f
tr
ip
le
p
ass
p
r
o
to
co
l
3.
H
I
L
L
C
I
P
H
E
R
T
E
XT
M
E
T
H
O
D
I
t'
s
f
ar
th
e
s
y
s
te
m
s
t
h
at
r
ep
lace
ex
p
r
ess
tex
t
u
al
co
n
ten
t
s
y
m
b
o
l
s
w
it
h
d
if
f
er
en
t
s
y
m
b
o
ls
to
r
ea
p
th
e
en
cr
y
p
ted
te
x
t
u
al
co
n
ten
t
a
n
d
th
e
lo
ca
tio
n
s
o
f
t
h
o
s
e
s
y
m
b
o
ls
d
o
n
o
w
n
o
t
c
h
a
n
g
e,
b
u
t
i
n
s
tead
t
h
e
s
y
m
b
o
ls
th
e
m
s
el
v
es a
r
e
co
n
v
er
ti
n
g
.
I
n
h
er
w
o
r
k
,
s
h
e
i
s
b
ased
o
n
li
n
e
ar
alg
eb
r
a,
d
ev
elo
p
ed
w
it
h
t
h
e
aid
o
f
L
ester
S
Hill
in
1
9
2
9
[
7]
,
as
s
h
o
w
n
i
n
Fi
g
u
r
e
3
.
I
t
is
o
n
e
o
f
th
e
co
m
p
e
n
s
ato
r
y
er
a
m
et
h
o
d
s
u
s
ed
to
en
co
d
e
letter
s
an
d
co
n
v
er
t
t
h
e
m
to
n
u
m
b
er
s
,
as
i
t
d
ep
en
d
s
o
n
th
e
tab
le
o
f
E
n
g
lis
h
le
tter
s
i
n
clu
s
i
v
e
o
f
(
2
6
)
letter
s
s
tar
ti
n
g
f
r
o
m
letter
A
a
n
d
en
d
in
g
w
it
h
t
h
e
le
tter
Z
,
ac
co
r
d
in
g
to
T
ab
le
1
.
Ad
d
itio
n
al
l
y
in
t
h
is
m
et
h
o
d
t
h
e
s
ec
r
et
k
e
y
’
s
u
s
ed
w
it
h
in
t
h
e
co
d
in
g
s
y
s
te
m
a
n
d
is
ar
r
a
n
g
ed
i
n
th
e
f
o
r
m
o
f
a
s
q
u
ar
e
m
atr
i
x
(
r
an
g
e
o
f
r
o
w
s
=r
a
n
g
e
o
f
co
l
u
m
n
s
)
an
d
th
e
m
ath
e
m
at
ical
eq
u
atio
n
is
u
s
ed
(
1
)
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J
E
lec
&
C
o
m
p
E
n
g
I
SS
N:
2
0
8
8
-
8708
Mixed
Hill C
ip
h
er
meth
o
d
s
w
i
th
tr
ip
le
p
a
s
s
p
r
o
to
co
l m
eth
o
d
s
(
L
iq
a
a
S
a
a
d
i Mezh
er
)
4451
=
.
(
26
)
(
1
)
I
n
s
id
e
t
h
e
ca
s
e
o
f
d
ec
r
y
p
tio
n
,
w
e
tak
e
th
e
i
n
v
er
s
e
o
f
th
e
k
e
y
[
32
]
-
[
2
5
]
tak
in
g
th
e
f
i
n
al
r
esu
l
t f
r
o
m
t
h
e
co
d
in
g
p
r
o
ce
s
s
,
an
d
th
e
u
s
e
o
f
th
e
m
at
h
e
m
atica
l (
2
)
.
=
−
1
.
(
26
)
(
2
)
An
d
ex
tr
ac
ti
n
g
t
h
e
p
lain
tex
t
an
d
th
en
a
f
ter
th
at
th
e
n
u
m
b
e
r
s
ar
e
ch
an
g
ed
w
ith
t
h
e
aid
o
f
th
e
letter
s
in
s
tep
w
it
h
T
ab
le
2
.
Fig
u
r
e
3
.
E
n
cr
y
p
tio
n
a
n
d
d
ec
r
y
p
t
io
n
o
f
Hi
ll C
ip
h
er
T
ab
le
1
.
C
o
n
v
er
t le
tter
to
n
u
m
b
er
A
B
C
D
E
F
G
H
I
J
K
L
M
0
1
2
3
4
5
6
7
8
9
10
11
12
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
13
14
15
16
17
18
19
20
21
22
23
24
25
T
ab
le
2
.
C
o
n
v
er
t n
u
m
b
er
to
letter
0
1
2
3
4
5
6
7
8
9
10
11
12
A
B
C
D
E
F
G
H
I
J
K
L
M
13
14
15
16
17
18
19
20
21
22
23
24
25
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
4.
T
P
P
B
ASE
D
O
N
H
I
L
L
C
I
P
H
E
R
AL
G
O
RI
T
H
M
S
C
o
n
s
titu
te
th
e
p
lai
n
tex
t to
s
q
u
ar
e
m
a
tr
ix
(
N
*
N)
.
C
o
n
v
er
t le
tter
p
lain
te
x
t
m
a
tr
i
x
to
n
u
m
b
er
p
lain
te
x
t
m
atr
ix
r
elied
o
n
th
e
T
ab
le
1
,
u
s
e
th
e
s
q
u
ar
e
k
e
y
.
Fo
llo
w
t
h
e
en
cr
y
p
tio
n
(
1
)
to
n
u
m
b
er
p
lain
te
x
t
m
atr
i
x
an
d
th
e
u
s
e
o
f
Hi
ll C
ip
h
er
tex
t.
R
ep
ea
t step
(
3
)
,
to
a
p
p
ly
tr
ip
le
p
ass
p
r
o
to
co
l (
T
T
P)
to
d
is
co
v
er
th
e
cip
h
er
tex
t.
C
o
n
v
er
t K
e
y
to
in
v
er
s
e
Ke
y
.
A
p
p
l
y
t
h
e
Dec
r
y
p
tio
n
(
2
)
,
t
h
e
u
s
e
o
f
t
h
e
f
i
n
a
l
r
e
s
u
l
t
o
f
c
i
p
h
e
r
t
e
x
t
u
a
l
c
o
n
t
e
n
t
w
i
t
h
i
n
v
e
r
s
e
tex
t
u
al
co
n
te
n
t.
R
ep
ea
t step
(
6
)
,
to
a
p
p
ly
tr
ip
le
p
ass
p
r
o
to
co
l (
T
T
P)
to
f
in
d
th
e
p
lain
tex
t.
C
o
n
v
er
t
th
e
n
u
m
b
er
p
lain
te
x
t
m
a
tr
ix
to
letter
p
lain
tex
t
m
atr
i
x
d
ep
en
d
ed
o
n
th
e
T
a
b
le
2
,
to
f
in
d
th
e
o
r
ig
in
al
p
lai
n
tex
t.
5.
CASE
S
T
UD
Y
Sev
er
al
ex
a
m
p
les
h
a
v
e
b
ee
n
ca
r
r
ied
o
u
t
to
s
y
m
b
o
lize
th
e
T
T
P
w
i
th
Hi
ll
C
ip
h
er
tex
t.
T
h
e
ca
lcu
latio
n
s
y
s
te
m
u
s
ag
e
o
f
t
h
e
m
ix
tu
r
e
o
f
th
e
t
w
o
a
lg
o
r
it
h
m
s
i
n
s
id
e
t
h
e
t
h
r
ee
p
ass
p
r
o
to
co
l
s
ch
e
m
e
is
as
f
o
llo
w
s
:
Fo
r
ex
a
m
p
le,
s
e
n
d
er
d
esire
s
to
en
c
r
y
p
t p
lai
n
tex
t
w
h
ic
h
w
it
h
t
h
e
aid
o
f
th
e
u
s
ag
e
o
f
Hill C
ip
h
er
.
a.
E
x
a
m
p
le
1
I
n
th
i
s
ca
s
e,
th
e
p
lai
n
te
x
t =
(
HE
L
P
)
an
d
th
e
Ke
y
=
[
1
2
; 0
3
]
:
C
o
n
s
titu
te
th
e
p
lai
n
tex
t to
s
q
u
ar
e
m
a
tr
ix
(
N
*
N)
,
in
w
h
ich
N
=2
.
=
[
]
C
o
n
v
er
t th
e
p
lai
n
tex
t
f
r
o
m
t
h
e
letter
m
atr
ix
to
n
u
m
b
er
m
atr
ix
u
s
i
n
g
T
ab
le
1
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
0
8
8
-
8708
I
n
t J
E
lec
&
C
o
m
p
E
n
g
,
Vo
l.
11
,
No
.
5
,
Octo
b
e
r
2
0
2
1
:
4
4
4
9
-
4457
4452
=
[
]
=
[
7
11
4
15
]
Ke
y
=
[
1
2
0
3
]
E
n
cr
y
p
tio
n
t
h
e
p
lain
te
x
t b
y
u
s
in
g
(
1
)
.
1
=
.
26
1
=
[
1
2
0
3
]
.
[
7
11
4
15
]
26
1
=
[
15
41
12
45
]
26
=
[
15
15
12
19
]
.
2
=
.
1
26
2
=
[
1
2
0
3
]
.
[
15
15
12
19
]
26
2
=
[
39
53
36
57
]
26
=
[
13
1
10
5
]
3
=
.
2
26
3
=
[
1
2
0
3
]
.
[
13
1
10
5
]
26
3
=
[
33
11
30
15
]
26
=
[
7
11
4
15
]
Dec
r
y
p
tio
n
t
h
e
cip
h
er
tex
t to
p
lain
te
x
t b
y
u
s
i
n
g
k
e
y
in
v
er
s
e
an
d
th
e
3
b
ased
o
n
(
2
)
:
−
1
=
[
1
8
0
9
]
1
=
−
1
.
3
26
1
=
[
1
8
0
9
]
.
[
7
11
4
15
]
26
1
=
[
39
131
36
135
]
26
=
[
13
1
10
5
]
.
2
=
−
1
.
1
26
2
=
[
1
8
0
9
]
.
[
13
1
10
5
]
26
2
=
[
93
41
90
45
]
26
=
[
15
15
12
19
]
.
3
=
−
1
.
2
26
3
=
[
1
8
0
9
]
.
[
15
15
12
19
]
26
3
=
[
111
167
108
171
]
26
=
[
7
11
4
15
]
.
∴
ℎ
=
3
=
[
7
11
4
15
]
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J
E
lec
&
C
o
m
p
E
n
g
I
SS
N:
2
0
8
8
-
8708
Mixed
Hill C
ip
h
er
meth
o
d
s
w
i
th
tr
ip
le
p
a
s
s
p
r
o
to
co
l m
eth
o
d
s
(
L
iq
a
a
S
a
a
d
i Mezh
er
)
4453
C
o
n
v
er
t th
e
n
u
m
b
er
m
atr
i
x
o
f
p
lain
tex
t to
letter
m
atr
i
x
u
s
in
g
T
ab
le
2
:
-
ℎ
=
[
7
11
4
15
]
=
[
]
.
∴
ℎ
=
b.
E
x
a
m
p
le
2
I
n
th
i
s
ca
s
e,
th
e
p
lai
n
te
x
t =
(
I
L
OVE
I
R
AQ)
an
d
th
e
Ke
y
=
[
1
2
6
;
0
3
5
; 4
7
8
]
:
C
o
n
s
titu
te
th
e
p
lai
n
tex
t to
s
q
u
ar
e
m
a
tr
ix
(
N
*
N)
,
in
w
h
ich
N
=3
.
=
[
]
.
Co
n
v
er
t th
e
p
lai
n
tex
t
f
r
o
m
t
h
e
letter
m
atr
ix
to
n
u
m
b
er
m
atr
ix
u
s
i
n
g
T
ab
le
1
.
=
[
]
=
[
8
21
17
11
4
0
14
8
16
]
=
[
6
24
1
13
16
10
20
17
15
]
.
E
n
cr
y
p
tio
n
t
h
e
p
lain
te
x
t b
y
u
s
in
g
(
1
)
.
1
=
.
26
1
=
[
6
24
1
13
16
10
20
17
15
]
.
[
8
21
17
11
4
0
14
8
16
]
26
1
=
[
326
230
118
420
417
381
557
608
580
]
26
=
[
14
22
14
4
1
17
11
10
8
]
2
=
.
1
26
2
=
[
6
24
1
13
16
10
20
17
15
]
.
[
14
22
14
4
1
17
11
10
8
]
26
2
=
[
191
166
500
356
402
534
513
607
689
]
26
=
[
9
10
6
18
12
14
19
9
13
]
3
=
.
2
26
3
=
[
6
24
1
13
16
10
20
17
15
]
.
[
9
10
6
18
12
14
19
9
13
]
26
3
=
[
505
357
385
595
412
432
771
539
553
]
26
=
[
11
19
21
23
22
16
17
19
7
]
.
Dec
r
y
p
tio
n
t
h
e
cip
h
er
tex
t to
p
lain
te
x
t b
y
u
s
i
n
g
k
e
y
in
v
er
s
e
an
d
th
e
3
b
ased
o
n
(
2
)
:
-
−
1
=
[
8
5
10
21
8
21
21
12
8
]
1
=
−
1
.
3
26
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
0
8
8
-
8708
I
n
t J
E
lec
&
C
o
m
p
E
n
g
,
Vo
l.
11
,
No
.
5
,
Octo
b
e
r
2
0
2
1
:
4
4
4
9
-
4457
4454
1
=
[
8
5
10
21
8
21
21
12
8
]
.
[
11
19
21
23
22
16
17
19
7
]
26
1
=
[
373
452
318
772
974
716
643
815
689
]
26
=
[
9
10
6
18
12
14
19
9
13
]
.
2
=
−
1
.
1
26
2
=
[
8
5
10
21
8
21
21
12
8
]
.
[
9
10
6
18
12
14
19
9
13
]
26
2
=
[
352
230
248
732
495
511
557
426
398
]
26
=
[
14
22
14
4
1
17
11
10
8
]
.
3
=
−
1
.
2
26
3
=
[
8
5
10
21
8
21
21
12
8
]
.
[
14
22
14
4
1
17
11
10
8
]
26
3
=
[
242
281
277
557
680
598
430
554
562
]
26
=
[
8
21
17
11
4
0
14
8
16
]
.
∴
ℎ
=
3
=
[
8
21
17
11
4
0
14
8
16
]
C
o
n
v
er
t th
e
n
u
m
b
er
m
atr
i
x
o
f
p
lain
tex
t to
letter
m
atr
i
x
u
s
in
g
T
ab
le
2
:
-
ℎ
=
[
8
21
17
11
4
0
14
8
16
]
=
[
]
.
∴
ℎ
=
I
L
OVE
I
R
A
Q
c.
E
x
a
m
p
le
3
I
n
th
i
s
ca
s
e,
th
e
p
lai
n
tex
t
=
(
SOFT
W
A
R
E
C
OM
P
UT
E
R
)
an
d
th
e
Ke
y
=
[
3
5
7
2
; 1
4
7
2
; 6
3
9
1
7
; 1
3
5
4
1
6
]
: Co
n
s
titu
te
t
h
e
p
lain
te
x
t
to
s
q
u
ar
e
m
atr
ix
(
N
*
N)
,
in
wh
ich
N=
4
.
=
[
]
.
C
o
n
v
er
t
th
e
p
lai
n
tex
t
f
r
o
m
t
h
e
letter
m
atr
ix
to
n
u
m
b
er
m
atr
ix
u
s
i
n
g
T
ab
le
1
.
=
[
]
=
[
18
22
14
0
2
20
14
19
5
17
19
4
12
4
15
17
]
=
[
3
5
1
4
7
2
7
2
6
3
13
5
9
17
4
16
]
E
n
c
r
y
p
ti
o
n
t
h
e
p
lain
te
x
t b
y
u
s
in
g
(
1
)
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J
E
lec
&
C
o
m
p
E
n
g
I
SS
N:
2
0
8
8
-
8708
Mixed
Hill C
ip
h
er
meth
o
d
s
w
i
th
tr
ip
le
p
a
s
s
p
r
o
to
co
l m
eth
o
d
s
(
L
iq
a
a
S
a
a
d
i Mezh
er
)
4455
1
=
.
26
1
=
[
3
5
1
4
7
2
7
2
6
3
13
5
9
17
4
16
]
.
[
18
22
14
0
2
20
14
19
5
17
19
4
12
4
15
17
]
26
1
=
[
197
193
147
149
190
217
172
158
518
353
628
418
417
502
384
64
3
]
26
=
[
15
11
17
19
8
9
16
2
24
15
4
2
1
8
20
19
]
.
2
=
.
1
26
2
=
[
3
5
1
4
7
2
7
2
6
3
13
5
9
17
4
16
]
.
[
15
11
17
19
8
9
16
2
24
15
4
2
1
8
20
19
]
26
2
=
[
306
237
259
196
151
131
1
19
111
425
292
440
330
445
455
508
463
]
26
=
[
20
3
25
14
21
1
15
7
9
6
24
18
3
13
14
21
]
3
=
.
2
26
3
=
[
3
5
1
4
7
2
7
2
6
3
13
5
9
17
4
16
]
.
[
20
3
25
14
21
1
15
7
9
6
24
18
3
13
14
21
]
26
3
=
[
296
157
231
137
187
171
130
162
684
420
805
421
436
501
584
436
]
26
=
[
10
1
23
7
5
15
0
6
8
4
25
5
20
7
12
20
]
Dec
r
y
p
tio
n
t
h
e
cip
h
er
tex
t to
p
lain
te
x
t b
y
u
s
i
n
g
k
e
y
in
v
er
s
e
an
d
th
e
3
b
ased
o
n
(
2
)
:
-
−
1
=
[
15
21
23
9
0
15
0
22
15
16
24
7
18
3
15
3
]
1
=
−
1
.
3
26
1
=
[
15
21
23
9
0
15
0
22
15
16
24
7
18
3
15
3
]
.
[
10
1
23
7
5
15
0
6
8
4
25
5
20
7
12
20
]
26
1
=
[
1008
237
987
196
255
651
379
839
737
214
596
148
471
507
456
567
]
26
=
[
20
3
25
14
21
1
15
7
9
6
24
18
3
13
14
21
]
.
2
=
−
1
.
1
26
2
=
[
15
21
23
9
0
15
0
22
15
16
24
7
18
3
15
3
]
.
[
20
3
25
14
21
1
15
7
9
6
24
18
3
13
14
21
]
26
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
0
8
8
-
8708
I
n
t J
E
lec
&
C
o
m
p
E
n
g
,
Vo
l.
11
,
No
.
5
,
Octo
b
e
r
2
0
2
1
:
4
4
4
9
-
4457
4456
2
=
[
1
1
8
5
609
1
2
1
3
591
840
477
926
548
934
431
862
314
651
424
696
331
]
26
=
[
15
11
17
19
8
9
16
2
24
15
4
2
1
8
20
19
]
.
3
=
−
1
.
2
26
3
=
[
15
21
23
9
0
15
0
22
15
16
24
7
18
3
15
3
]
.
[
15
11
17
19
8
9
16
2
24
15
4
2
1
8
20
19
]
26
3
=
[
642
594
586
468
756
462
768
643
941
745
851
628
454
368
379
407
]
26
=
[
18
22
14
0
2
20
14
19
5
17
19
4
12
4
15
17
]
.
∴
ℎ
=
3
=
[
1
8
22
14
0
2
20
14
19
5
17
19
4
12
4
15
17
]
C
o
n
v
er
t th
e
n
u
m
b
er
m
atr
i
x
o
f
p
lain
tex
t to
letter
m
atr
i
x
u
s
in
g
T
ab
l
e
2:
-
ℎ
=
[
18
22
14
0
2
20
14
19
5
17
19
4
12
4
15
17
]
=
[
]
.
∴
ℎ
=
.
6.
CO
NCLU
SI
O
N
I
n
th
is
p
ap
er
,
w
e
r
ev
ie
w
ed
a
d
if
f
er
e
n
t
m
et
h
o
d
s
u
s
ed
Hill
C
ip
h
er
m
et
h
o
d
w
ith
tr
ip
le
p
ass
p
r
o
to
co
l
m
et
h
o
d
(
T
T
P
)
.
T
h
e
Hill
C
ip
h
er
T
ec
h
n
ical
u
s
e
a
p
er
s
o
n
al
k
e
y
i
n
e
n
cr
y
p
tio
n
a
n
d
t
h
e
i
n
v
e
r
s
e
s
a
m
e
k
e
y
w
h
e
n
u
s
ed
d
ec
r
y
p
tio
n
.
I
n
t
h
r
ee
p
ass
p
r
o
to
c
o
l
an
y
k
e
y
n
o
e
x
ch
a
n
g
e
f
o
r
en
cr
y
p
tio
n
a
n
d
d
ec
r
y
p
ti
o
n
.
A
p
p
l
y
t
h
e
Hil
l
C
ip
h
er
alg
o
r
it
h
m
s
d
ep
en
d
ed
o
n
th
r
ee
p
ass
p
r
o
to
co
l
p
er
io
d
(
th
r
ee
tim
e
s
)
.
W
e
d
is
cu
s
s
e
d
s
ec
u
r
it
y
f
o
r
th
e
m
es
s
ag
e
s
e
n
d
er
a
n
d
r
ec
eiv
er
in
m
an
y
ca
s
es.
Fi
n
all
y
,
t
h
e
r
esu
lt
o
f
th
e
p
ap
er
d
escr
ip
tio
n
t
h
i
s
s
y
s
te
m
s
a
n
d
i
m
p
le
m
en
ta
tio
n
o
f
al
g
o
r
ith
m
s
an
d
p
r
o
v
id
es
s
o
m
e
as
s
is
ta
n
ce
in
i
m
p
r
o
v
i
n
g
e
n
cr
y
p
tio
n
a
n
d
d
ec
r
y
p
tio
n
p
r
o
ce
s
s
to
en
s
u
r
e
n
et
w
o
r
k
s
a
f
et
y
.
RE
F
E
R
E
NC
E
S
[1
]
D.
Ra
c
h
m
a
w
a
ti
,
M
.
A
Bu
d
im
a
n
,
L
A
u
l
y
a
,
"
T
h
re
e
-
p
a
ss
p
ro
to
c
o
l
sc
h
e
m
e
f
o
r
b
it
m
a
p
i
m
a
g
e
s
e
c
u
rit
y
b
y
u
sin
g
v
e
rn
a
m
c
ip
h
e
r
a
lg
o
rit
h
m
,
"
IOP
Co
n
fer
e
n
c
e
s
S
e
rie
s:
M
a
ter
ia
ls
S
c
ien
c
e
a
n
d
En
g
in
e
e
rin
g
,
v
o
l
.
3
0
8
,
n
o
.
1
,
2
0
1
8
,
A
rt.
No
.
0
1
2
0
0
3
,
d
o
i:
1
0
.
1
0
8
8
/1
7
5
7
-
8
9
9
X/3
0
8
/
1
/0
1
2
0
0
3
.
[2
]
P
.
V
e
rm
a
a
n
d
G
.
S
.
Ga
b
a
,
“
Co
h
e
re
n
t
Ca
e
sa
r
Cip
h
e
r
f
o
r
Re
so
u
rc
e
Co
n
stra
in
e
d
De
v
ice
s,”
In
ter
n
a
t
io
n
a
l
J
o
u
rn
a
l
o
f
S
e
c
u
rity a
n
d
Its
Ap
p
li
c
a
t
io
n
s
,
v
o
l.
1
0
,
n
o
.
5
,
p
p
.
3
2
7
-
3
3
6
,
2
0
1
6
,
d
o
i:
1
0
.
1
4
2
5
7
/i
jsia.
2
0
1
6
.
1
0
.
5
.
3
1
.
[3
]
I
.
G
.
S
u
m
a
rn
o
,
H
.
S
.
T
a
m
b
u
n
a
n
,
E
.
Ira
w
a
n
,
H
.
Qu
r
n
iaw
a
n
a
n
d
D
.
Ha
rtam
a
,
“
Co
m
b
in
a
ti
o
n
o
f
Ca
e
sa
r
Cip
h
e
r
A
l
g
o
rit
h
m
a
n
d
Riv
e
st
S
h
a
m
ir
Ad
lem
a
n
A
lg
o
rit
h
m
f
o
r
S
e
c
u
rin
g
Do
c
u
m
e
n
t
F
il
e
s
a
n
d
T
e
x
t
M
e
ss
a
g
e
s,”
J
o
u
rn
a
l
o
f
Ph
y
sic
s Co
n
fer
e
n
c
e
S
e
rie
s
,
v
o
l.
1
2
5
5
,
2
0
1
9
,
A
rt.
No
.
0
1
2
0
7
7
,
d
o
i
:
1
0
.
1
0
8
8
/
1
7
4
2
-
6
5
9
6
/1
2
5
5
/1
/
0
1
2
0
7
7
.
[4
]
O.
E.
O
m
o
lara
,
A
.
I.
Olu
d
a
re
,
S
.
E.
A
b
d
u
lah
i,
“
De
v
e
lo
p
in
g
a
M
o
d
if
ied
H
y
b
rid
Ca
e
s
a
r
Cip
h
e
r
a
n
d
V
ig
e
n
e
re
Cip
h
e
r
f
o
r
S
e
c
u
re
Da
ta Co
m
m
u
n
ica
ti
o
n
,
”
Co
mp
u
ter
E
n
g
in
e
e
rin
g
a
n
d
I
n
te
ll
ig
e
n
t
S
y
ste
ms
,
v
o
l.
5
,
n
o
.
5
,
p
p
.
3
4
-
4
6
,
2
0
1
4
.
[5
]
A
.
Ba
d
a
w
i,
M
.
Zarlis,
S
.
S
u
h
e
rm
a
n
,
"
Im
p
a
c
t
th
r
e
e
p
a
ss
p
ro
to
c
o
l
m
o
d
if
ic
a
ti
o
n
s
to
k
e
y
tran
s
m
issio
n
p
e
rf
o
rm
a
n
c
e
,
"
J
o
u
rn
a
l
o
f
P
h
y
sic
s Co
n
fer
e
n
c
e
s S
e
rie
s
,
v
o
l.
1
2
3
5
,
2
0
1
9
,
A
rt.
No
.
0
1
2
0
5
0
,
d
o
i:
1
0
.
1
0
8
8
/1
7
4
2
-
6
5
9
6
/
1
2
3
5
/1
/
0
1
2
0
5
0
.
[6
]
A
.
M
.
H
.
P
a
rd
e
d
e
,
H
.
M
a
n
u
r
u
n
g
,
D
.
F
il
in
a
,
"
A
lg
o
rit
m
a
V
ig
e
n
e
re
Cip
h
e
r
Da
n
Hill
Ci
p
h
e
r
Da
la
m
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“
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if
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[8
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S
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T
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it
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[1
1
]
K.
G
n
a
n
a
S
u
sh
m
a
,
B.
V
.
S
.
S
.
N.
Ra
ju
,
"
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p
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m
e
n
tatio
n
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f
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e
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,
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n
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(
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,
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1
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3
,
p
p
.
1
4
1
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5
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1
9
.
[1
2
]
P
.
K.
De
y
a
n
d
T
.
K
.
D
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y
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“
Cr
y
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to
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ra
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h
ica
ll
y
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se
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f
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e
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a
r
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in
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d
S
e
c
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S
y
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m
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d
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o
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8
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,
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.
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3
]
S
.
N
.
G
o
w
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a
,
“
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n
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4
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.
V
e
rm
a
,
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.
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.
G
a
b
a
a
n
d
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.
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o
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a
,
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o
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Ca
e
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r
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h
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g
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lar
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e
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h
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2
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5
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.
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5
]
N.
S
h
ib
iraj,
I.
T
o
m
b
a
,
"
M
o
d
if
i
e
d
Hill
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h
e
r:
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e
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n
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q
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e
u
sin
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ti
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n
d
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a
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q
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a
re
,
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ter
n
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t
io
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l
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o
u
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o
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g
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5
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2
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se
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2
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.
[1
6
]
Z
.
E.
Da
w
a
h
d
e
h
,
S
.
N.
Ya
a
k
o
b
,
R
.
R
.
b
i
n
Ot
h
m
a
n
,
"
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Ne
w
I
m
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g
e
En
c
ry
p
ti
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T
e
c
h
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i
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p
to
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ste
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w
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h
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Cip
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e
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"
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o
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rn
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l
o
f
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n
g
S
a
u
d
Un
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rs
it
y
-
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ter
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n
d
In
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rm
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ti
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n
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c
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e
n
c
e
s
,
v
o
l.
3
0
,
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o
.
3
,
p
p
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4
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5
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0
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jk
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2
0
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7
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0
6
.
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0
4
.
[1
7
]
A
.
J
a
in
,
R
.
De
d
h
ia
a
n
d
A
.
P
a
ti
l,
“
En
h
a
n
c
in
g
th
e
S
e
c
u
rit
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o
f
Ca
e
sa
r
Cip
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e
r
S
u
b
stit
u
t
i
o
n
M
e
th
o
d
u
sin
g
a
Ra
n
d
o
m
ize
d
A
p
p
ro
a
c
h
f
o
r
m
o
re
S
e
c
u
re
Co
m
m
u
n
ica
ti
o
n
,
”
In
ter
n
a
t
io
n
a
l
J
o
u
rn
a
l
o
f
Co
mp
u
ter
Ap
p
li
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a
ti
o
n
,
v
o
l
.
1
2
9
,
n
o
.
1
3
,
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p
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6
-
1
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,
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0
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5
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0
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5
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2
0
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jca
2
0
1
5
9
0
7
0
6
2
.
[1
8
]
Y
.
In
a
n
,
”
A
n
a
l
y
z
in
g
T
h
e
Cla
ss
ic
Ca
e
sa
r
M
e
th
o
d
Cry
p
to
g
ra
p
h
y
,
”
4
th
I
n
ter
n
a
ti
o
n
a
l
C
o
n
fer
e
n
c
e
o
n
Co
mp
u
t
a
ti
o
n
a
l
M
a
th
e
ma
ti
c
s a
n
d
En
g
in
e
e
rin
g
S
c
ien
c
e
s (
C
M
ES
-
2
0
1
9
),
v
o
l.
2
3
,
2
0
1
9
,
p
p
.
2
1
3
-
2
2
0
.
[1
9
]
N
.
N.
Ku
c
h
e
r
o
v
,
M
.
A
.
De
ry
a
b
in
,
M
.
G
.
Ba
b
e
n
k
o
,
“
Ho
m
o
m
o
rp
h
ic
En
c
ry
p
ti
o
n
M
e
th
o
d
s
Re
v
ie
w
,
”
2
0
2
0
I
EE
E
Co
n
fer
e
n
c
e
o
f
Ru
ss
ia
n
Y
o
u
n
g
R
e
se
a
rc
h
e
rs
in
El
e
c
tri
c
a
l
a
n
d
El
e
c
tro
n
ic
En
g
in
e
e
rin
g
(
EICo
n
Ru
s)
,
S
t.
P
e
ters
b
u
rg
a
n
d
M
o
sc
o
w
,
Ru
ss
ia,
2
0
2
0
,
p
p
.
3
7
0
-
3
7
3
,
d
o
i:
1
0
.
1
1
0
9
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IC
o
n
R
u
s4
9
4
6
6
.
2
0
2
0
.
9
0
3
9
1
1
0
.
[2
0
]
N
.
A
.
Ka
k
o
,
“
Clas
sic
a
l
Cr
y
p
to
g
ra
p
h
y
f
o
r
Ku
rd
ish
L
a
n
g
u
a
g
e
,
”
4
th
In
ter
n
a
ti
o
n
a
l
E
n
g
in
e
e
rin
g
Co
n
fer
e
n
c
e
o
n
De
v
e
lo
p
me
n
ts i
n
Civil
&
Co
mp
u
t
e
r E
n
g
i
n
e
e
rin
g
A
p
p
li
c
a
ti
o
n
s
,
v
o
l.
4
,
2
0
1
8
,
p
p
.
2
0
-
2
8
,
d
o
i:
1
0
.
2
3
9
1
8
/i
e
c
2
0
1
8
.
0
2
.
[2
1
]
A
.
S
u
b
a
n
d
i,
R
.
M
e
iy
a
n
ti
,
C
.
L
.
M
.
S
a
n
d
y
,
R.
W
.
S
e
m
b
iri
n
g
,
“
Th
re
e
-
P
a
ss
P
r
o
to
c
o
l
Im
p
lem
e
n
tatio
n
i
n
V
ig
e
n
e
re
Cip
h
e
r
Clas
sic
Cry
p
to
g
ra
p
h
y
A
lg
o
rit
h
m
w
it
h
Ke
y
stre
a
m
Ge
n
e
ra
to
r
M
o
d
if
ica
ti
o
n
,
”
J
o
u
rn
a
l
o
f
A
d
v
a
n
c
e
s
in
S
c
ien
c
e
,
T
e
c
h
n
o
l
o
g
y
a
n
d
E
n
g
i
n
e
e
rin
g
S
y
st
e
ms
,
v
o
l.
2
,
n
o
.
5
,
p
p
.
1
-
5
,
2
0
1
7
,
d
o
i:
1
0
.
2
5
0
4
6
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0
2
0
5
0
1
.
[2
2
]
B
.
Ok
tav
ian
a
a
n
d
A
.
P
.
U
.
S
iah
a
a
n
,
“
T
h
re
e
-
P
a
ss
P
r
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to
c
o
l
Im
p
lem
e
n
tatio
n
i
n
Ca
e
sa
r
Cip
h
e
r
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sic
Cr
y
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