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    "Interactive Signature Scheme between Confirmer and Signer"

    In the undeniable signature, a signature can only be verified with cooperation of a signer. But if a signer should become unavailable, then a recipient cannot make use of the signature. The concept of the confirmer signatures was introduced to solve this weakness of the undeniable signatures. In all previous confirmer signature scheme, a signer generates a signature using a designated confirmer's public key. This allows a signer to generate a confirmer signature without a confirmer's permission. We provided a interactive confirmer signature scheme model that a signer can generate a confirmer signature only with a cooperation of a confirmer.

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