DES Encryption



There are two inputs to the encryption function: plaintext to be encrypted (64 bits) and the key (56 bits).

 

The left side shows the basic process for enciphering a 64-bit data block which consists of three phases:

 

An Initial Permutation (IP) which shuffles (rearranges) the 64-bit input  plaintext to produce the permuted input.

 

16 rounds of a complex key dependent round function, involving substitutions & permutations. The output of the 16th round consists of 64 bits that are a function of the input plaintext  and the key. The left and right halves of the output are swapped to produce the pre output.

 

A Final Permutation, being the inverse of IP of the preoutput produce the 64 bit ciphertext.

Editor: Neha Bhosale Added on: 2020-05-05 20:17:37 Total View:377







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