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Data Encryption Standard (DES) is an algorithm for symmetric encryption, developed by IBM and adopted by U.S. government in 1977 as an official standard (FIPS 46-3), the block size for DES is 64 bits and the algorithm is based on a Feistel network with 16 cycles (rounds) and a key having a length of 56 bits, this algorithm uses a combination of nonlinear (S-blocks) and linear (permutations E, IP, IP-1) transformations.