Cryptography – Key management – Having particular key generator
Patent
1993-08-04
1995-01-10
Gregory, Bernarr E.
Cryptography
Key management
Having particular key generator
380 9, 380 21, 380 29, 380 34, 380 43, 380 46, 375 1, H04L 900, H04L 2730
Patent
active
053814819
ABSTRACT:
Methods and apparatus are described for uniquely encrypting a plurality services at a transmission site and for decrypting selected services at a reception site while reducing the amount of encryption related information that must be transmitted to the reception site for decryption purposes. A unique spreading function is generated at the transmission site for each service to be transmitted. A random quantity is then transmitted, and the random quantity is convolved with each spreading function to produce a unique encryption seed for each service. At least a portion of each service is then encrypted using the unique encryption seeds produced for each service. Only the random quantity is transmitted to the reception site along with the encrypted portions of each service. None of the unique encryption seeds are transmitted. At the reception site, the unique spreading functions generated at the transmission site for each service are regenerated. A selected service is then decrypted by (i) convolving the received random quantity with the regenerated spreading function associated with the selected service to reproduce the unique encryption seed used to encrypt the received encrypted portion of the selected service at the transmission site, and (ii) decrypting the received encrypted portion of the selected service using the reproduced encryption seed. By transmitting only the random quantity, and then reproducing the encryption seeds at the reception site, the amount of encryption related information transmitted to the reception site is greatly reduced.
REFERENCES:
patent: 4613901 (1986-09-01), Gilhousen
patent: 4736422 (1988-04-01), Mason
patent: 4802215 (1989-01-01), Mason
patent: 5029207 (1991-07-01), Gammie
patent: 5115467 (1992-05-01), Esserman
Gammie Keith
Sheldrick Wayne S.
Wasilewski Anthony J.
Woo Arthur S.
Gregory Bernarr E.
Scientific-Atlanta, Inc.
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