Cryptanalysis of a Deniable Authentication Protocol Based on Bilinear Pairing using Single Sender and Group Sender

The aim of an efficient deniable authentication protocol is to enable a receiver to identify the source of a given message but not to prove the identity of the sender. Lu and Cao confirmed that the previous protocols had a common weakness in which any third party can impersonate the intended receiver to verify the signature of the given message, and they proposed a new protocol based on bilinear pairing using single sender and sender group.