Exploring Signature Schemes with Subliminal Channel

The subliminal channel in a cryptographic protocol such as an authentication system or a signature scheme provides an additional channel from the sender to an authorized receiver and can’t be read by any unauthorized receiver. In this paper, we firstly show that Hess’s ID-Based signature scheme in SAC’02 can provide digital signature with the broadband and narrowband subliminal channels. Secondly, we evaluate Jan-Tseng signature schemes with subliminal channel in ICPP’99 and show that any user can change the signature, such that the subliminal message receiver cannot get the subliminal message correctly, but the verification of signature is still right.