Chaffing and winnowing

Chaffing and winnowing is a cryptography technique, though as it works by hiding which part of a transmission is the message, it is classified as steganography. A message is broken into blocks, and each one is transmitted with a message authentication code[?], interspersed at random with other similar blocks, called chaff. The recipient checks the MAC of each block; those that do not match are chaff, and are winnowed out.

See also:

• null cipher