Secure credit card employing pseudo-random bit sequences for...

Details Secure credit card employing pseudo-random bit sequences for... Secure credit card employing pseudo-random bit sequences for...

2005-04-26

2005-04-26

Stcyr, Daniel (Department: 2876)

Registers

Records

Conductive

C235S380000

Reexamination Certificate

active

06883717

ABSTRACT:
A secure credit card has a pair of linear feedback shift registers (LFSRs) for generating a pair of random numbers. The LFSRs each have a unique initial state and feedback tap configuration. Hence, they each produce a unique sequence of numbers. When a financial transaction occurs, the LFSRs are operated for a random number of clock cycles, to create a pair of matched random numbers. Each card issued has unique LFSR settings, and so will produce characteristic random numbers. At a financial institution, the LFSR settings are known, so the financial institution can determine by calculation if the pair of random numbers is authentic. There are many variations, including a credit card with a secret security code for activation, and 2-way “handshake” communication with the financial institution. Also, one of the LFSRs may be replaced with a binary, or similar counter.

REFERENCES:
patent: 5478994 (1995-12-01), Rahman et al.
patent: 6641050 (2003-11-01), Kelley et al.
patent: 6814283 (2004-11-01), Fujimoto

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