Undeniable signature

Undeniable signature

Undeniable signatures are a form of digital signature invented by David Chaum and Hans van Antwerpen in 1989. They have two distinctive features,

# The verification process is interactive, so that the signatory can limit who can verify the signature.
# A disavowal protocol, which is a cryptographic protocol that allows them to determine whether a given signature is a forgery.

The first means that a signatory can allow only others who are authorized to access the document to verify their signature. If the document were to be leaked to a third party, the third party would be unable to verify that the signature is genuine.

However, because of this property it means that the signatory may deny a signature which "was" valid. To prevent this, there is the second property, a method to prove that a given signature is a forgery.

See also

* Topics in cryptography

References

*David Chaum, Hans van Antwerpen: "Undeniable Signatures"; Crypto'89, LNCS 435, Springer-Verlag, Berlin 1990, 212-216.


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