Efficient and Short Identity-Based Deniable Authenticated Encryption

Deniable authentication is an important security requirement for many applications that require user privacy protection, since the sender can deny that he/she has signed the message. Considering the importance of communication efficiency, in this paper, we explore the novel deniable authenticated encryption, which outperforms the existing ones in terms of communication costs and ciphertext size. Our protocol meets all the security requirement of message confidentiality and deniable message authentication. Our protocol is based on identity cryptography and can avoid the public key certificates based public key infrastructure (PKI). Our protocol is provably secure in the random oracle model.