Cryptographic data integrity with serial bit processing and pseu

Details Cryptographic data integrity with serial bit processing and pseu Cryptographic data integrity with serial bit processing and pseu

1997-05-09

2000-05-30

Swann, Tod R.

Cryptography

Particular algorithmic function encoding

380 46, 380268, H04K 100, H04L 900

Patent

active

06069954&

ABSTRACT:
A new structure for a secret key cryptography algorithm uses double exclusive-or (XOR) encryption (e.sub.i =k1.sub.i XOR m.sub.i XOR k2.sub.1), analogue to a stream cipher arrangement, but providing data integrity protection. The double XOR encryption creates an inner sequence, for example s.sub.i =k1.sub.i XOR m.sub.i for the encryption process, s.sub.i =k2.sub.i XOR e.sub.i for the decryption process, which is unknown to the adversary and is used as a starting point for feedback on the very key streams used in the encryption of following bits of the message. In its preferred embodiment, this structure is the Frogbit data integrity algorithm which uses 10 independent pseudo-random sources. The Frogbit algorithm is well suited to the design and implementation of "semi-proprietary" ciphers, where the overall design is publicly known and peer-reviewed but a significant amount of the implementation specification is left open to private customization. The Frogbit algorithm is a means to create computer programs and microprocessor-based devices that are harder to crack with reverse engineering than with the prior art.

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