Electronic data processing device

Details Electronic data processing device Electronic data processing device

2004-12-06

2008-11-18

Vu, Kimyen (Department: 2135)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

Tamper resistant

C713S187000, C713S189000, C726S026000

Reexamination Certificate

active

07454629

ABSTRACT:
An electronic data processing device, comprising an access protected memory, provided for storing secure data and a data processing member, provided for processing said secure data, said terminal comprises a tampering detection and protection circuit provided for detecting a tamper condition and for generating a tamper signal upon detection of said tamper condition, said tampering detection and protection circuit being connected to a tampering sequencer, provided for disabling said processing member upon receipt of said tampering signal, said memory comprises a security register provided for storing keys for encrypting said secure data and a memory section provided for storing keys for encrypting said secure data and a memory section provided for temporarily storing secure data processed by said data processing member, said tampering sequencer comprises an internal clock generator provided for generating, upon receipt of said tamper signal a tamper pulse and a series of clock pulses, said tampering sequencer being provided for erasing under control of said tamper pulse, said security data stored in said security register and for erasing, under control of said series of clock pulses said processed secure data stored in said memory section.

REFERENCES:
patent: 4882752 (1989-11-01), Lindman et al.
patent: 5457748 (1995-10-01), Bergum et al.
patent: 6292898 (2001-09-01), Sutherland
patent: 6917299 (2005-07-01), Fu et al.
patent: 1 160 647 (2001-12-01), None

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