The Subliminal Channel and Its Capacity in Proxy Signatures

摘要

A type of new broadband subliminal channel in proxy signatures is constructed. In proxy signatures the proxy signer signs a message on behalf of the original signer, so it is no sense that the original signer (the subliminal receiver in our construction) abuses the signing power.And the original signer can limit the signing power of the proxy signer, so our construction avoids the defect existing in the traditional broadband subliminal channel. Finally,other types of subliminal channels in proxy signature and their capacity are also briefly discussed.