Vernam Cipher Part a requires you to encrypt the plaintext Part b requires you t
ID: 3593071 • Letter: V
Question
Vernam Cipher
Part a requires you to encrypt the plaintext
Part b requires you to covert the encrypted cyphertext to plaintext
A=1, B=2, …, Z=26
a)
Plaintext:
I
N
F
O
R
M
A
T
I
O
N
I
S
I
M
P
O
R
T
A
N
T
Plain Text value
One-Time Pad Text
P
G
R
I
F
K
X
L
Q
A
J
M
C
H
B
D
E
O
S
V
P
N
One-Time Pad Value:
Sum of plaintext pad:
After modulo subtract:
Cypertext:
b)
Plaintext:
Plain Text value
One-Time Pad Text
X
F
J
W
D
A
E
T
O
U
C
G
B
L
I
H
One-Time Pad Value:
Sum of plaintext pad:
After modulo subtract:
Cypertext:
Y
X
O
V
S
V
X
U
U
Z
R
U
N
U
W
M
Plaintext:
I
N
F
O
R
M
A
T
I
O
N
I
S
I
M
P
O
R
T
A
N
T
Plain Text value
One-Time Pad Text
P
G
R
I
F
K
X
L
Q
A
J
M
C
H
B
D
E
O
S
V
P
N
One-Time Pad Value:
Sum of plaintext pad:
After modulo subtract:
Cypertext:
Explanation / Answer
Plaintex
t:
I
N
F
O
R
M
A
T
I
O
N
I
S
I
M
P
O
R
T
A
N
T
Plain Text value
9
14
6
15
18
13
1
20
9
15
14
9
19
9
13
16
15
18
20
1
14
20
One-Time Pad Text
P
G
R
I
F
K
X
L
Q
A
J
M
C
H
B
D
E
O
S
V
P
N
One-Time Pad Value:
16
7
18
9
6
11
24
12
17
1
10
13
3
8
2
4
5
15
19
22
16
14
Sum of plaintext pad:
25
21
24
24
24
24
25
32
26
16
24
22
22
17
15
20
20
33
39
23
30
34
After modulo subtract:mod 26
25
21
24
24
24
24
25
6
0
16
24
22
22
17
15
20
20
7
13
23
4
8
Cypertext:
Y
U
X
X
X
X
Y
F
Z
P
X
V
V
Q
O
T
T
G
M
W
D
H
(a)
26 Mod 26 =0 0 no value so take Z=0 or 26
b)
Cypertext
Y
X
O
V
S
V
X
U
U
Z
R
U
N
U
W
M
Cypertext value
25
24
15
22
19
22
24
21
21
26
18
21
14
21
23
13
One-Time Pad Text
X
F
J
W
D
A
E
T
O
U
C
G
B
L
I
H
One-Time Pad Value:
24
6
10
23
4
1
5
20
15
21
3
7
2
12
9
8
subtration of cypertext- key:
1
18
5
-1
15
21
19
1
6
5
15
14
12
9
14
5
After modulo:26
1
18
5
25
15
21
19
1
6
5
15
14
12
9
14
5
plaintext:
A
R
E
Y
O
U
S
A
F
E
O
N
L
I
N
E
Plaintex
t:
I
N
F
O
R
M
A
T
I
O
N
I
S
I
M
P
O
R
T
A
N
T
Plain Text value
9
14
6
15
18
13
1
20
9
15
14
9
19
9
13
16
15
18
20
1
14
20
One-Time Pad Text
P
G
R
I
F
K
X
L
Q
A
J
M
C
H
B
D
E
O
S
V
P
N
One-Time Pad Value:
16
7
18
9
6
11
24
12
17
1
10
13
3
8
2
4
5
15
19
22
16
14
Sum of plaintext pad:
25
21
24
24
24
24
25
32
26
16
24
22
22
17
15
20
20
33
39
23
30
34
After modulo subtract:mod 26
25
21
24
24
24
24
25
6
0
16
24
22
22
17
15
20
20
7
13
23
4
8
Cypertext:
Y
U
X
X
X
X
Y
F
Z
P
X
V
V
Q
O
T
T
G
M
W
D
H
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