SUBSTITUTION PROCESSING DEVICE AND RECORDING MEDIUM WITH PROGRAM THEREOF RECORDED THEREON

PROBLEM TO BE SOLVED: To perform a first S-P conversion or non-linear conversion S-linear conversion P in the substitution processing of non-linear conversion S-linear conversion P-non-linear conversion S in a common key block cryptograph with less frequencies of table reference and operation in acc...

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Bibliographic Details
Main Author KANDA MASASUKI
Format Patent
LanguageEnglish
Published 31.08.2001
Edition7
Subjects
ADVERTISING
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
CODING OR CIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHERPURPOSES INVOLVING THE NEED FOR SECRECY
CRYPTOGRAPHY
DECODING
DISPLAY
EDUCATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PHYSICS
SEALS
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:PROBLEM TO BE SOLVED: To perform a first S-P conversion or non-linear conversion S-linear conversion P in the substitution processing of non-linear conversion S-linear conversion P-non-linear conversion S in a common key block cryptograph with less frequencies of table reference and operation in accordance with package environment. SOLUTION: This device refers to tables S1, S2, S3, and S4 by inputs x1, x2,..., x8; takes the exclusive ORs of the outputs S1(x1), S2(x2), S3(x2), S4(x4) to obtain U1; takes the exclusive ORs of S2(x5), S3(x6), S4(x7), S1(x8) to obtain U2; obtains U1(+)U2→U3; rotates U2 upward by 1 byte; and obtains an exclusive OR of the result and U3 to output the result U4 and U3.
Bibliography:Application Number: JP20000044529