Secure Threshold Subliminal Channel Based on Signcryption
Minghui Zheng · Journal of Chinese Computer Systems · 2007
Signcryption can be used to design efficient subliminal channels.This paper points out that the CLL signcryption scheme has two limitations:it can be forged and cannot be verified when disputes arise,and then modify CLL scheme,so that the ciphertext can be verified publicly and the hidden message only can be recovered by the designated verifier.Based on the proposed signcryption scheme,this paper proposes a threshold subliminal channel which can convey a subliminal message to a group of users.Reconstructing the subliminal message relies on the cooperation of t or more users in the group and the validity of the subliminal message can be verified by them.The massage sender needs not to generate nor get the users' private key.Experiments security and performance analysis show the proposed scheme is secure and efficient.