Undeniable signature

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The Undeniable signature scheme was devised by David Chaum and Hans van Antwerpen in 1989. They are non-self-authenticating signature schemes.

Here signatures can only be verified with the signer's consent. However, if a signature is only verifiable with the aid of a signer, a dishonest signer may refuse to authenticate a genuine document. Undeniable signatures solve this problem by adding a new component called the disavowal protocol in addition to the normal components of signature and verification. This is implemented using Public-key Cryptography based on the discrete logarithm problem.

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