DES encryption algorithm is complete, use the C language, has been tested, you can run. 64-bit plaintext sub-head. Effective length 56-bit master key, according to the key generation algorithm, the master key generation sub-16 48-bit keys. A total of 16 rounds of the algorithm, each round using a sub-key. During 16 rounds of encryption before doing an initial replacement of the clear IP. Each round of encryption round function f as:. In 16, after encryption, the bit string L16R16 transposition for the R16 L16, do inverse permutation IP-1, to obtain ciphertext C.

DES.c

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