Cryptography – Cryptanalysis
Patent
1997-03-11
2000-06-13
Swann, Tod R.
Cryptography
Cryptanalysis
380 28, H04K 102
Patent
active
060758597
ABSTRACT:
In a communications system, a method of transforming a set of message signals representing a message comprising the steps of first encoding one of the set of message signals in accordance with a first keyed transformation, a second encoding of the one of the set of message signals in accordance with at least one additional keyed transformation, a third encoding of the one of the set of message signals in accordance with a self inverting transformation in which at least one of the set of message signals is altered, a fourth encoding of the one of the set of message signals in accordance with at least one additional inverse keyed transformation wherein each of the at least one additional inverse keyed transformation is a corresponding inverse of at least one additional keyed transformation, and fifth encoding the one of the set of message signals in accordance with first inverse keyed transformation wherein the first inverse keyed transformation is the inverse of the first keyed transformation.
REFERENCES:
patent: 5159643 (1992-10-01), Reeds, III
patent: 5214703 (1993-05-01), Massey et al.
patent: 5594797 (1997-01-01), Alanaraet et al.
patent: 5687238 (1997-11-01), Shimada
"IS-95-A Appendix A: Message Encryption and Voice Privacy" Nov. 16, 1994 Reissued Mar. 14, 1996, pp. 1-7.
Coddington Trevor Quick
English Sean
Miller Russell B.
Qualcomm Incorporated
Rouse Thomas R.
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