Constructions of variable input length cryptographic...

Details Constructions of variable input length cryptographic... Constructions of variable input length cryptographic...

2007-05-22

2007-05-22

Smithers, Matthew (Department: 2137)

Cryptography

Communication system using cryptography

Time segment interchange

Reexamination Certificate

active

10113666

ABSTRACT:
A hash function is applied to a prefix of a VIL input. The output is added to a suffix of the input. A block cipher is applied to results of the addition. An encryption function is performed on the prefix. The final output is the output of the block cipher and the encryption function. In a second encryption technique, a hash function is applied to an input, and the output of the hash function has first and second portions. A block cipher is applied to the second portion. The output of the block cipher is added to the first portion, and a second function is applied to the result of this first addition. The output of the second function is added to the second portion. An inverse hash function is then applied to the output of the first and second additions, creating an encrypted output.

REFERENCES:
patent: 5757913 (1998-05-01), Bellare et al.
patent: 6236729 (2001-05-01), Takaragi et al.
patent: 2002/0051537 (2002-05-01), Rogaway
Bellare et al., “On the Construction of Variable-Input-Length Ciphers,” Proc. of Fast Software Encryption, Lecture Notes in Comp. Sci. 1636 (1999).
Naor et al., “On the Construction of Pseudo-Random Permutations: Luby-Rackoff Revisited,” Journal of Cryptology 12, 1, 29-66 (1999).

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