# Encrypt the Plaintext Below Using the Caesar Cipher

Topics: Cryptography, E-mail, Transport Layer Security Pages: 25 (1667 words) Published: December 14, 2010

Exercise
1:

Encrypt the plaintext below using the Caesar cipher: THE CAESAR CIPHER IS A TYPICAL EXAMPLE OF A SUBSTITUTION CRYPTOSYSTEM.

t
19
22
w

a 0 n 13

b 1 o 14

c 2 p 15

d 3 q 16

e 4 r 17

f 5 s 18

g 6 t 19

h 7 u 20

i 8 v 21

j 9 w 22

k 10 x 23

l 11 y 24

m 12 z 25

Encryption
formula:
f(x)= x+k (mod26) Character to be shifted to the right by k; x is the characterʼs numerical equivalent.   h
7
10
k
e
4
7
h
c
2
5
f
u
20
23
x
a
0
3
d
b
1
4
e
e
4
7
h
s
18
21
v
s
18
21
v
t
19
22
w
a
0
3
d
r
17
20
u
c
2
5
f
i
8
11
l
u
20
23
x
p
15
18
s
t
19
22
w
h
7
10
k
i
8
11
l
e
4
7
h
o
14
17
r
r
17
20
u
n
13
16
q
i
8
11
l
c
2
5
f
s
18
21
v
r
17
20
u
a
0
3
d
y
24
1
b
t
19
22
w
p
15
18
s
y
24
1
b
t
19
22
w
p
15
18
s
o
14
17
r
i
8
11
l
s
18
21
v
c
2
5
f
y
24
1
b
a
0
3
d
l
11
14
o
e
4
7
h
x
23
0
a
e
4
7
h
a
0
3
d
m
12
15
p
p
15
18
s
l
11
14
o
e
4
7
h
o
14
17
r
f
5
8
i
a
0
3
d

s
18
21
v

i
8
11
l

t
19
22
w

s
18
21
v

t
19
22
w

m
12
15
p

Ciphertext:
WKH
FDHVDU
FLSKHU
LV
D
WBSLFDO
RI
D
VXEVWLWXWLRQ
FUBSWRVBVWHP

1

Exercise
2
1) How would you test a piece of cipertext to determine quickly if it was the likely results of a transposition? If we know the key (shift), the formula f(x)=x-k (mod26) can be used ; x being the encrypted value.

w
22
19
t
v
21
18
s

k
10
7
h

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