# Simplified DES Exercise

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Simplified DES Exercise
Consider all of the following information, to calculate the output (cipher text) using DES algorithm. (Assume DES algorithm consists of 1-round only)
1           Plain text
Let the plaintext be the string

1

1

1
1.1          Initial permutation table (IP)
IP
2
6
3
1
4
8
5
7

1

1
1

1.2         Split left  L1 (4bits) and right R1 (4 bits)

1

1
1

1.3         Right goes to function (1.4) shown below

1
1

Functions
Expansion permutation E/P :
Expansion Permutation

1
2
3
2
3
4

1
1
1
1

XOR with Key                           The key = 101001

1
1
1
1

1

1

1
1
1

1
1
1
Output
S-Box  (Substitution)
1
1
1

P  permutation:
Permutation
2
4
3
1
1

1
1
Xor with left L1
1

1
1
Xor

1

Old left

1

1
New left (old right)                                                                            new right

1
1

1

1
IP −1
4
1
3
5
7
2
8
6

OUT PUT (Cipher Text)

1
1

1
1

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