Information Hiding Techniques for Steganography and Digital Watermarking cover
Information Hiding Techniques for Steganography and Digital Watermarking
by Stefan Katzenbeisser, Fabien A. P. Petitcolas
ISBN: 1580530354
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crpatino · 2015-10-26 · Original thread
This technique has been publicly known for well over a decade. See: http://www.amazon.com/Information-Techniques-Steganography-D...

It's been a long time since I read it, but if I recall correctly, the UK government has been encoding the identity of the receiver of highly sensible information in this fashion for a long time. Probably it is SOP by now in most environments where truly important secrets are exchanged.