One time password
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United States of America Patent
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Dec 27, 2011
Grant Date -
Dec 17, 2009
app pub date -
Oct 17, 2005
filing date -
Oct 15, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A token calculates a one time password by generating a HMAC-SHA-1 value based upon a key K and a counter value C, truncating the generated HMAC-SHA-1 value modulo 10^Digit, where Digit is the number of digits in the one time password. The one time password can be validated by a validation server that calculates its own version of the password using K and its own counter value C′. If there is an initial mismatch, the validation server compensate for a lack of synchronization between counters C and C′ within a look-ahead window, whose size can be set by a parameter s.
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