Digital signature method
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United States of America Patent
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Dec 24, 2002
Grant Date -
N/A
app pub date -
Dec 18, 1998
filing date -
Dec 18, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates in particular to a method for generating a digital signature (c, d) of a message M as well as a method for authenticating such a signature having the steps of defining a modulo N and a base g, a public key Y, and a private key x, these parameters N, g, Y, and x being linked by the relationship Y=g.sup.x (mod N), defining a hash function H the size of whose result has S bits, choosing a number r of T bits with T>=2S, calculating u from the following relationship u=g.sup.r *Y.sup.z where Z=2.sup.s, hashing the concatenation of M and u, by function H, the number thus obtained being the value c of the signature, and calculating the value d of the signature by the relationship: d=r+c*x.
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