Research of the New Subliminal-free ElGamal Type Signature Schemes
Lei Pang, Fen Xu, Shou-Shan Luo, Bai Wang -, Yang Xin · International Workshop on Education Technology and Computer Science · 2011
Subliminal channel is a kind of hidden channels based on digital signatures which uses public key cryptography. Nobody knows whether the subliminal message exists or not in the digital signatures, except the recipient holds the private key of the signer. ElGamal type signature scheme uses a random parameter k as subliminal messages, the recipient shares the private key of the signer can recover the messages k. However, in the proxy signature, because of the two random parameters chosen by primitive signer and proxy signer, they can't make use of the random numbers to transmit subliminal message respectively. According to this idea, this paper designs ElGamal type signature schemes of Subliminal-freeness, on special occasions our schemes can avoid the illegal use of subliminal channel. Furthermore, we discuss and analyze the schemes' correctness, security and efficiency.