Cryptography – Communication system using cryptography – Data stream/substitution enciphering
Patent
1996-05-17
1997-12-02
Tarcza, Thomas H.
Cryptography
Communication system using cryptography
Data stream/substitution enciphering
380 48, H04L 918, H04L 900
Patent
active
056944730
ABSTRACT:
A method of decrypting retransmitted parts of a message includes receiving (201) a message comprising encryption synchronization and a plurality of encrypted blocks. Until a first block of the plurality of encrypted blocks is received with error, a first keystream is generated (205) from the encryption synchronization and at least one of the plurality of encrypted blocks, and, using the first keystream, the plurality of encrypted blocks, received without error before the first block of the plurality of encrypted blocks is received with error, is decrypted (207). A priming block is determined (211) from the message. When the first block of the plurality of encrypted blocks is received with error, a second message is transmitted (219) requesting a retransmission of the first block. Upon receiving the retransmission of the first block without error, a second keystream is generated (223) from the priming block and the retransmission of the first block and decrypting the retransmission of the first block is decrypted (225) using the second keystream.
REFERENCES:
patent: 4654480 (1987-03-01), Weiss
patent: 5233653 (1993-08-01), Katsurabayashi
patent: 5243653 (1993-09-01), Malek et al.
Bright Michael W.
Doberstein Kevin G.
Pappas Scott J.
Lukasik Susan L.
Motorola Inc.
Tarcza Thomas H.
White Carmen D.
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