Abstract:

In the rapid development of network information, the security of identity information has become particularly important and critical. Based on the certificate public key cryptosystem, this paper proposes a denial-authentication encryption scheme for certificates with privacy protection features, which effectively avoids the security problems of the voter identity in the electronic voting process and the sender's sending email. Under the random oracle model(ROM), based on the bilinear Diffie-Hellman(BDH) assumption and Computational Diffie-Hellman(CDH) assumption, the scheme is proved to satify the indistinguishability and the existential unforgeability.Meanwhile, the scheme satisfies the denial, not only protects the privacy of voters and senders, but also denies voting messages and sending messages to better solve privacy problems. Compared with the existing identity-based denied authentication encryption schemes, the efficiency of the scheme is equivalent to the above ones in the aspects of encryption and verification, however the key escrow problems of those schemes are eliminated.

Key words: deniable authenticated encryption, certificate-based public key encryption, random oracle model, electronic voting