Encipher method and decipher method

Details Encipher method and decipher method Encipher method and decipher method

1989-04-27

1991-01-01

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

380 29, 380 50, H04L 906, H04L 928

Patent

active

049824295

ABSTRACT:
There are provided an encipher method of enciphering message data made by a microcomputer or the like at a high speed by using encipher keys which have previously been stored in a smart card or the like and a decipher method of deciphering the ciphertext made by the encipher method at a high speed by using the encipher keys. The encipher method and the decipher method are suitable for, particularly, a 32-bit microcomputer and include a process expressed by the function Rot.sub.2 i(x) (i=2, 3, 4) in each process. Rot.sub.2 i(x) is the process to circular shift a data train x of 32 bits to the left or right by 2.sup.i bits (i=2, 3, 4).

REFERENCES:
patent: 4319079 (1982-03-01), Best
Koyama et al., "Modern Theory of Encryption", The Institute of Electronics and Communications Engineers of Japan; pp. 41-62; Sept., 1986 (in Japanese).
Shimizu et al., "Fast Data Encipherment Algorithm Feal"; Papers of the Institute of Electronics and Communication Engineers of Japan; D. vol. J70-D, No. 7, pp. 1413-1423; Jul., 1987 (in Japanese).

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