A digital signature with multiple subliminal channels and its applications

In this paper, we present two schemes for embedding multiple subliminal messages into one-time signature schemes (OTSSs) proposed by Lamport (1971, 1981) [35,36]. Our schemes have the advantage that the subliminal receivers cannot forge a valid signature since they do not share the signerʹs secret key. Our schemes can also provide more than one independent subliminal message, and the numbers of subliminal messages and receivers are larger than that of the subliminal messages in previous schemes.