Cryptography – Cryptanalysis
Patent
1996-01-30
1999-04-06
Hayes, Gail O.
Cryptography
Cryptanalysis
395186, 380 3, 707103, H04L 900, G06F 1214
Patent
active
058928260
ABSTRACT:
A data processor (20) which flexibly encrypts data within different address ranges includes an encryption determination circuit (50) to monitor an address conducted on an internal address bus (22) and when the address is within certain predefined ranges, perform encryption or decryption of address and/or data. For example the encryption determination circuit (50) may be used to selectively enable a data encryption-decryption circuit (60). When the data encryption-decryption circuit (60) is disabled, data conducted on an internal data bus (23) becomes "cleartext", i.e., non-encrypted. In one embodiment, the data encryption-decryption is performed in partial dependence on the address itself, and the address conducted to the external address bus is itself selectively encrypted as well.
REFERENCES:
patent: 4120030 (1978-10-01), Johnstone
patent: 4168396 (1979-09-01), Best
patent: 4278837 (1981-07-01), Best
patent: 4573119 (1986-02-01), Westheimer et al.
patent: 4583196 (1986-04-01), Koo
patent: 4633388 (1986-12-01), Chiu
patent: 5058164 (1991-10-01), Elmer et al.
patent: 5155829 (1992-10-01), Koo
patent: 5214701 (1993-05-01), Quisquater et al.
patent: 5224166 (1993-06-01), Hartman, Jr.
patent: 5249232 (1993-09-01), Erbes et al.
patent: 5251304 (1993-10-01), Sibigtroth et al.
patent: 5343525 (1994-08-01), Hung et al.
patent: 5513262 (1996-04-01), Van Rumpt et al.
Brown David L.
Polansky Paul J.
Pombo Raul A.
Hayes Gail O.
Laufer Pinchus M.
Motorola Inc.
Polansky Paul J.
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