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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Main Author | |
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Format | Patent |
Language | English |
Published |
31.08.2001
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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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. |
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Bibliography: | Application Number: JP20000044529 |