Verifying digital signature based on shared knowledge
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United States of America Patent
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May 3, 2011
Grant Date -
Jul 13, 2006
app pub date -
Aug 8, 2005
filing date -
Jan 7, 2005
priority date (Note) -
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Abstract
A method of verifying a digital signature of a first party that was generated using an elliptic curve digital signature algorithm (ECDSA) includes the steps of receiving a public key from the first party; receiving a digital signature from the first party, the digital signature being for an electronic message; identifying domain parameters of an elliptic curve used in elliptic curve cryptography, including identifying a generating point of the elliptic curve; transforming the identified generating point into a second generating point as a deterministic function of shared knowledge known to and between the first party and a second party; and verifying the received digital signature as a deterministic function of the received public key, the electronic message, and the identified domain parameters, in which the second generating point is substituted for the identified generating point.
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