Cryptography – Communication system using cryptography – Data stream/substitution enciphering
Patent
1988-10-28
1991-05-14
Buczinski, Stephen C.
Cryptography
Communication system using cryptography
Data stream/substitution enciphering
380 9, 380 28, 380 50, H04L 918
Patent
active
050162756
ABSTRACT:
Encryption and decryption mechanisms at transmitters and receivers, respectively, have applied thereto encryption or decryption keys and initializing values. These mechanisms generate cryptographic bit streams which are intermediate streams of generated values. These intermediate streams, generated prior to their real time need in the encryption or decryption processes, are stored in buffers until data is presented for encryption or decryption, at which time the cryptographic bit streams are conveyed from the buffers to mathematical functions, for combination with the data. This avoids the delays associated with the real time generation of the cryptographic bit streams during the encryption and decryption processes. Appropriate synchronization of the generation and buffer storage of the cryptographic bit streams at the transmitter and receiver is provided.
REFERENCES:
patent: 2995624 (1961-08-01), Watters
patent: 4172213 (1979-10-01), Barnes et al.
patent: 4471164 (1984-09-01), Henry
patent: 4520232 (1985-05-01), Wilson
patent: 4642424 (1987-02-01), McNair
patent: 4802217 (1989-01-01), Michener
Carl H. Meyer and Stephen M. Matyas, Cryptography: A New Dimension in Computer Data Security, Chapter 2, pp. 53-61, John Wiley & Sons (New York 1982).
Buczinski Stephen C.
Gregory Bernarr Earl
International Business Machines - Corporation
Lefeve Douglas H.
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