On the network PES2m-m, consisting of m round function and its modifications

Today one of the most effective methods of symmetric block cipher construction is the use of so-called Feistel network. This article based on Lai-Massey scheme developed network subblocks composed of 2m. In proposed networks, similar network Feistel, when encryption and decryption used same algorithm and as round function use any conversion. Based on these networks designed build a block encryption algorithm block length 64m bit sub-block at length of 32 bits, 32m length block sub-block length in bits equal to 16 bits and the length of the block with a length of 16m-bit sub-block of 8 bits.

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