High speed and method of providing high speed table generation f

Details High speed and method of providing high speed table generation f High speed and method of providing high speed table generation f

1997-12-10

2000-03-07

Laufer, Pinchus M.

Cryptography

Communication system using cryptography

Time segment interchange

380 28, H04L 906

Patent

active

060350423

ABSTRACT:
The present invention is an apparatus and method of encryption. A first table comprising a set of 2.sup.n distinct n-bit input numbers and a first set of 2.sup.n distinct n-bit output numbers is received. A second table comprising of the set of 2.sup.n distinct n-bit input numbers and a second set of 2.sup.n distinct n-bit output numbers is also received. The first and second sets of 2.sup.n n-bit output numbers are each a one-to-one mapping of the set of 2.sup.n n-bit input numbers, and the second mapping of 2.sup.n n-bit output numbers is disjoint from the first mapping of 2.sup.n n-bit output numbers. The first and the second tables are combined and a fourth table of 2.sup.n pairs of (n+1)-bit numbers is generated by converting each of the 2.sup.n pairs of n-bit input numbers and each of the 2.sup.n pairs of n-bit output numbers in the third table, to (n+1)-bit numbers. Clear text (n+1)-bit data is then encrypted by providing the (n+1)-bit clear text data as inputs to the fifth table to obtain cipher text (n+1)-bit numbers as outputs.

REFERENCES:
patent: 4776011 (1988-10-01), Busby
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patent: 5619576 (1997-04-01), Shaw
patent: 5623549 (1997-04-01), Ritter
patent: 5647001 (1997-07-01), Mittenthal
patent: 5778074 (1998-06-01), Grcken et al.
Mittenthal, L. "A Source of Cryptographically Strong Permutations for Use in Block Ciphers" Proceeding of IEEE, International Symposium on Information Theory 1993, p. 233.
Mittenthal, L. "Block Substitutions Using Orthomorphic Mappings" Advances in Applied Mathematics vol. 16, No. 1 (1995) pp. 59-71.

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