Secure credit card employing pseudo-random bit sequences for authentication
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United States of America Patent
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Apr 26, 2005
Grant Date -
N/A
app pub date -
Apr 14, 2004
filing date -
Apr 14, 2004
priority date (Note) -
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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.
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