Cryptography Reference
In-Depth Information
Diagram 3.3 The S-DES Decryption Flow Chart
input: c =( c 1 c 2 c 3 c 4 c 5 c 6 c 7 c 8 )
IP
c 2 c 6 c 3 c 1 c 4 c 8 c 5 c 7
F ( c 4 c 8 c 5 c 7 ,k 1 )
+
m 4 m 8 m 5 m 7 c 4 c 8 c 5 c 7
SW
c 4 c 8 c 5 c 7 m 4 m 8 m 5 m 7
F ( m 4 m 8 m 5 m 7 ,k 1 )
+
m 2 m 6 m 3 m 1 m 4 m 8 m 5 m 7
IP 1
output: m =( m 1 m 2 m 3 m 4 m 5 m 6 m 7 m 8 )
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