Fail-safe device driver and method

Details Fail-safe device driver and method Fail-safe device driver and method

1997-02-18

1999-08-31

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 4, 380 9, 380 50, 380 59, 395680, 395681, 36523006, 709301, H04L 900, G06F 1310

Patent

active

059463996

ABSTRACT:
A device driver (104) is used to provide a fail-safe interface between a plurality of client applications and a cryptographic card. Device driver (104) ensures separation between red data, black data, and command data. Device driver (104) uses objects and object handles to control data flow. Device driver (104) uses several simplex channels to control data flow. Each channel is managed separately using its own object, and each channel has unique access protection through the object handles. Within device driver (104), the simplex channel interfaces are kept separate and functional separation of the data and command memory is maintained to provide fail-safe data isolation.

REFERENCES:
patent: 4987595 (1991-01-01), Marino, Jr. et al.
patent: 5029206 (1991-07-01), Marino, Jr. et al.
patent: 5283828 (1994-02-01), Saunders et al.
patent: 5436621 (1995-07-01), Macko et al.

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