A New Forward-Secure and Confirmer Digital Signature Scheme

Based on the theory of forward secure digital signature scheme and confirmer signature scheme, a new forward secure and confirmer signature scheme is proposed It is the first time that forward secure and confirmer are combined in a digital signature scheme The idea of zero knowledge proof is used in the confirming process The scheme is proven to be secure under the assumption of the intractability of factoring and discrete logarithm and quadric remain problems Forward security of the scheme means that even if the secret key of current time period is compromised, some security remains: it is not possible to forge the signature relating to the past Secret key is evolved with different period time while the public key is fixed in the life time And the partially trusted player-conformer could verify the signature who can control the distribution of the verification of the signature and prevent the signer from denying the disadvantageous signature