System and method for communication between smart cards
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United States of America Patent
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Mar 12, 2013
Grant Date -
N/A
app pub date -
Jul 28, 2000
filing date -
Jul 28, 1999
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Abstract
A method and system which provides communication between a first portable device and a second portable device. The first portable device stores a first sequence number and a first key, and the second portable device stores a second sequence number and a second key. Verification is performed using the first and second keys. The first sequence number is compared to the second sequence number. If the second sequence number is newer than the first sequence number, the first sequence number is set to have a value of the second sequence number if the verification succeeds. If the first sequence number is newer than the second sequence number, the second sequence number is set to have a value of the first sequence number if verification succeeds.
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