Apparatus for encryption and decryption, capable of use in...

Details Apparatus for encryption and decryption, capable of use in... Apparatus for encryption and decryption, capable of use in...

2007-06-26

2007-06-26

Zand, Kambiz (Department: 2134)

Cryptography

Communication system using cryptography

Data stream/substitution enciphering

C380S047000, C380S259000, C713S174000

Reexamination Certificate

active

10108355

ABSTRACT:
An apparatus for encryption and decryption, capable of use in encryption and decryption of advanced encryption standard. Byte substitution operation and inverse byte substitution operation are to be combined. Byte substitution operation can be expressed as y=M*multiplicative_inverse(x)+c while inverse byte substitution operation can be expressed as x=multiplicative_inverse(M−1*(y+c)), wherein M and M−1are inverse matrix of each other and c is a constant matrix. Since the two equations employ a look-up table, that is, multiplicative_inverse(x), the lookup tables for use in byte substitution and inverse byte substitution operations are to be combined according to the invention so as to lower hardware complexity of the implementation. In addition, main operations of column mixing operation and inverse column mixing operation are to be rearranged to combine the two operations in part, resulting in simplified hardware implementation.

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