DES is a typical block-cipher- a fixed-length level Through a complex series of operations into the algorithm of the same length of the ciphertext. Terms of the DES, the block length of 64. Meanwhile, DES uses the key to customize the transformation process, so the algorithm that only holds encryption keys the user can decrypt the ciphertext. Key surface is 64, of which only 56 are actually used in the algorithm, however, the remaining eight bits can be used for parity, and in the algorithm are discarded. Therefore, effective key length of DES to 56, usually known as the DES key length of 56 bits.

DES\des.c
...\dh.c
...\dh_sys.c
DES

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