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IMI/Publicaţii/CSJM/Ediţii/CSJM v.5, n.2 (14), 1997/

Provably indeterminate 128-bit cipher

Authors: N. Moldovyan
Keywords: Software encryption, indeterminate algorithm, block cipher, flexible cryptosystem.

Abstract

There is described a class of the encryption functions based on data-dependent selection of subkeys. Such functions are proposed for elaboration of the indeterminate ciphers with very large number of different modifications of the cryptalgorithm. A 128-bit undetermined cipher is described. The number of possible modifications is »1020R, where 2 Ј R Ј 7, R is the number of rounds. It is proved that all modifications are unique.

N.A.Moldovyan
Institute of Modelling and Intellectualization of Complex Systems,
Prof. Popov Str., 5, St-Petersburg
197376, Russia;
phone: 7(812) 2340415; fax: 7(812)2349093
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