Apparatus and method for encrypting security sensitive data

Details Apparatus and method for encrypting security sensitive data Apparatus and method for encrypting security sensitive data

2007-11-20

2007-11-20

Chung, Phung My (Department: 2117)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital logic testing

C714S724000, C713S176000

Reexamination Certificate

active

11297948

ABSTRACT:
An interlinked chain of exclusive-or (XOR) logic gates and registers is formed by connecting a first input of each XOR logic gate to an output of a preceding register, and by connecting an input of each register to an output of a preceding XOR logic gate. Each XOR logic gate has a second input connected to receive an output from a respective data source. The interlinked chain further includes an originating XOR logic gate having its first input connected to an output of an originating data source rather than to a preceding register. The interlinked chain includes a terminating XOR logic gate having an output defined to provide an encrypted signature for the various data source outputs. Destructible bypass connections are provided to enable direct access to each data source in a secure environment and permanently disable direct access to each data source prior to release from the secure environment.

REFERENCES:
patent: 5126950 (1992-06-01), Rees et al.
patent: 6424926 (2002-07-01), Mak
patent: 7228474 (2007-06-01), Williams et al.
patent: 2003/0131295 (2003-07-01), Berry et al.
patent: 2004/0133832 (2004-07-01), Williams et al.

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