Hiding a secret message within a larger one in such a way that others can not discern the presence or contents of the hidden message. For example, a message might Be hidden within an imageBy changing the least significant Bits to Be the message Bits. [{Chaffing and Winnowing: Confidentiality without Encryption, Ronald L. Rivest, MIT LaB for Computer Science, 1998-03-22 (http://theory.lcs.mit.edu/~rivest/chaffing.txt)}]. (1998-07-13)