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For the published block cipher algorithm, two kinds of round functions have been researched.Block ciphers in network environments are taking more risks than ever before because of their initialization key’s distribution in the internet.The security of block cipher algorithm is affected by linear bias and nonlinear bias which are restricted by confusion layer and diffusion layer.This article takes an approach on how block cipher’s two round structures are initially transformed when they fuse into LFSR.The SP structure can be considered two F functions in one Feistel round function which combines both right and left of origin data transformation.Furthermore, the round number linear function and nonlinear function of Feistel and SP structure are compared.The merit of SP structure is that it can fuse in LFSR as a nonlinear filter without memory.
For the published block cipher algorithm, two kinds of round functions have been researched.Block ciphers in network environments are taking more risks than ever before because of their initialization key’s distribution in the internet. The security of block cipher algorithm is affected by linear bias and nonlinear bias which are restricted by confusion layer and diffusion layer. This article takes an approach on how block cipher’s two round structures are initially transformed when they fuse into LFSR. The SP structure can be considered two F functions in one Feistel round function which works both right and left of origin data transformation. Future plus, the round number linear function and nonlinear function of Feistel and SP structure are compared. The merit of SP structure is that it can fuse in LFSR as a nonlinear filter without memory.