Cryptography – Key management – Having particular key generator
Patent
1992-05-13
1994-01-11
Gregory, Bernarr E.
Cryptography
Key management
Having particular key generator
380 9, 380 46, 380 49, 380 50, H04L 900
Patent
active
052789055
ABSTRACT:
The penalties and drawbacks associated with encrypting information in a portable device having a microprocessor are avoided by, in advance of the time for encryption to begin, having the microprocessor develop portions of a key sequence during periods of time that the microprocessor is not engaged in performing any function necessary for the operation of the portable device and storing each developed portion of the key sequence for later use in encrypting information. In one embodiment, at least one entire key sequence of sufficient length to encrypt a string of information that has a predetermined maximum possible length is developed and stored in advance of the beginning of any encrypting. In another embodiment, at least a predetermined length of key sequence less than the length necessary to encrypt a maximum length string is stored in advance of the beginning of any encrypting and key sequence generation continues on a time multiplexed basis while the string is being encrypted until the entire string is encrypted.
REFERENCES:
patent: 2406031 (1946-08-01), Parker
patent: 3291908 (1966-12-01), Ehrat
patent: 3876832 (1975-04-01), Morgan et al.
patent: 3967066 (1976-06-01), Mathes
patent: 4459664 (1984-07-01), Pottier et al.
AT&T Bell Laboratories
Gregory Bernarr E.
Rosenthal Eugene J.
Slusky Ronald D.
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