TWEAKABLE BLOCK CIPHERS FOR SECURE DATA ENCRYPTION

摘要

A block cipher encryption device for encrypting a data unit plaintext into blocks of ciphertexts, the data unit plaintext being assigned a tweak value and being divided into one or more plaintext blocks. The block cipher encryption device comprises:- a combinatorial function unit (82-j) associated with each plaintext block (P_j), the combinatorial function unit (82-j) being configured to determine a tweak block value (T_j) by applying a combinatorial function between a value derived from the tweak value and a function of a block index assigned to the plaintext block,- a first masking unit (83-j) in association with each plaintext block (P_j), the first masking unit (83-j) being configured to determine a masked value M_j(T_j) by applying a data masking algorithm to the tweak block value (T_j) determined by the combinatorial function unit (82-j) associated with the plaintext block.