steg
n.— «You may have heard of steganography, an encryption technique that lets you hide embedded messages, documents, etc. within a normal-looking image. Very James Bond. A company at Demo 2007 called Ceelox just introduced something called Scram, which puts “steg” into the hands of everyday users as well as advertisers and businesses.» —“Secret messages hidden in images” by Steve Fox InfoWorld Jan. 31, 2007. (source: Double-Tongued Dictionary)