Threshold subliminal channel based on designated verifier signature
Li Su, Cui Guohua, Yang Muxiang, Chen Jing · Wuhan University Journal of Natural Sciences · 2006
The subliminal channel is used to send a secret message to an authorized receiver; the message cannot be discovered by any unauthorized receivers. Designated verifier signature(DVS) provide authentication of a message, we design a DVS scheme with message recovery mechanism and use it as a subliminal channel. In order to share a message among n users securely and allows t or more users can reconstruct the secret in dynamic groups, we combine both subliminal channel and ( t, n ) threshold cryptography. Then we proposed a threshold subliminal channel which can convey a subliminal message to a group of users based on message-recovery designated verifier signatures. Reconstructing the subliminal message relies on the cooperation of t or more users in the group and they can verify the validity of the subliminal message. Security and performance analysis show that the proposed scheme is secure and efficient.