New subliminal channel embedded in the ESIGN

摘要

The subliminal channel is one of the methods for hiding a messagein other messages. Simmons has shown conjectures on the upper boundto the bandwidth of a sublimi- nal channel. This paper proposes a newbroad-band subliminal channel embedded in the ESIGN. The bandwidth ofthe pro- posed subliminal channel is wider than that of the previousone, and it exceeds the upper bond that Simmons has conjectured.Namely, we disprove the conjectures due to Simmons. We also Show hatit is possible to construct the subliminal channel even If thetransmitter and the subliminal receiver do not have any Key incommon.