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Caesar Cipher
Caesar Cipher: Shift 3
plaintext
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ciphertext
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Select the shift value
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The Caesar Cipher is a substitution cipher.
Encryption
With a shift value of 3 each letter is replaced with the letter that is 3 positions further forward
Decryption
With a shift value of 3 each letter is replaced with the letter that is 3 positions further back. Alternatively, this is the equivalent of replacing each letter with the letter that is 23 positions further back
plaintext
ciphertext
Note:
Spaces are preserved
Uppercase characters are converted to lowercase first
All other characters are removed
Calculation
Character
a
b
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Value
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Text Character
Text Value
Shift
Calculation
Cipher Value
Cipher Character
Polyalphabetic Cipher: 1, 2, 3
plaintext
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alphabet 1
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y
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a
alphabet 2
c
d
e
f
g
h
i
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m
n
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p
q
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x
y
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a
b
alphabet 3
d
e
f
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h
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a
b
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Select the number of alphabets
1
2
3
4
Select the shift value for alphabet 1
0
1
2
3
4
5
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7
8
9
10
11
12
13
14
15
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17
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21
22
23
24
25
Select the shift value for alphabet 2
0
1
2
3
4
5
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7
8
9
10
11
12
13
14
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17
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19
20
21
22
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24
25
Select the shift value for alphabet 3
0
1
2
3
4
5
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8
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Select the shift value for alphabet 4
0
1
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plaintext
ciphertext
Note:
Spaces are preserved
Uppercase characters are converted to lowercase first
All other characters are removed
Shift squence only applied to alphbetical characters
Calculation
Character
a
b
c
d
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f
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h
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Value
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Text Character
Text Value
Alphabet
Shift
Calculation
Cipher Value
Cipher Character
Alphabet
A
B
C
D
E
F
G
H
Binary Value
00000
00001
00010
00011
00100
00101
00110
00111
Alphabet
I
J
K
L
M
N
O
P
Binary Value
01000
01001
01010
01011
01100
01101
01110
01111
Alphabet
Q
R
S
T
U
V
W
X
Binary Value
10000
10001
10010
10011
10100
10101
10110
10111
Alphabet
Y
Z
[
#
]
^
$
%
Binary Value
11000
11001
11010
11011
11100
11101
11110
11111
Select the number of bits
4
5
6
plaintext
one-time pad
ciphertext
Note:
Spaces are preserved
Characters must match case of letters in the current alphabet
All other characters are removed
