Method and device for anonymous signature with a shared private key
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United States of America Patent
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Aug 4, 2009
Grant Date -
Aug 4, 2005
app pub date -
Dec 13, 2002
filing date -
Jan 4, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cryptographic method and apparatus for anonymously signing a message. Added to the anonymous signature is another signature which is calculated (operation 13) using a private key common to all the members of a group authorized to sign and unknown to all revoked members. The private key is updated (operations 8, 11) at group level on each revocation within the group and at member level only on anonymous signing of a message by the member.
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