Desinated-confirmer signature systems
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United States of America Patent
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-
Dec 13, 1994
Grant Date -
N/A
app pub date -
May 25, 1993
filing date -
May 25, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Cryptographic methods and apparatus for signing (101), receiving (102), verifying (103), and confirming (104) designated-confirmer signatures are disclosed. Such a signature (11) convinces the receiver that the confirmer can convince others that the signer issued the signature. Thus, more protection is provided to the recipient of a signature than with prior art zero-knowledge or undeniable signature techniques, and more protection is provided to the signer than with prior art self-authenticating signatures. A designated confirmer signature is formed in a setting where the signer creates and issues a public key (201) and the confirmer also creates and issues a public key (202). Should the confirmer offer a confirmation (13), the verifier is convinced that the signature was issued by the signer. Such confirmation can itself be, for example, self-authenticating, unconvincing to other parties, or designated confirmer. With plural confirmers, various combinations may be realized, some even including confirmer anonymity.
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