Most diversionary means are based on psychological reading of the adversary Layered encryption for subliminal messaging is one elegant way to achieve diversion, and acquire a built-in alarm for the message writer. Layered encryption is the case where the attempt to cryptanalyze a message results in some plausible plaintext, which satisfies the cryptanalyst that his or her work was done. In fact the real plaintext is buried still deeper, and only an additional digging will unearth it. Audio Snippet, 2 min .