DIFFERENTIAL PROPERTIES OF SYMMETRIC BLOCK CIPHERS WITH ROUND KEY MODULAR OPERATIONS OTHER THAN XOR
round key operations are considered. It is shown that known
ciphers with round operations other than XOR after small initial
encryption rounds acquire random substitution properties of
correspondent degree, but they achieve stationary maximal value
two times smaller than maximal value acquired for round operation
as bitwise XOR. It is concluded that application of round operations
other than XOR does not lead to significant growth of provable
cipher strength. It is mentioned that all iterative ciphers
independently of round key operation type give the same maximal
values of full differentials according to difference computation
operation as bitwise XOR.
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