The design of integrating subliminal channel with access control

Simmons first introduced the concept of subliminal channel in 1984. After that, many researches of digital signature with subliminal channels have been proposed. But these schemes just allow a subliminal receiver to get one subliminal message unless he/she maintains more secret keys. In this paper, we will integrate the concepts of subliminal channel and access control to construct two digital signature schemes with subliminal channels. In the proposed schemes, the subliminal receivers can get different number of subliminal messages in accordance with users' positions. Moreover, each subliminal receiver only needs to keep one secret key.