Re: [WM]: Watermaking with permuting letter order.

[Xcott Craver <sacraver@EE.Princeton.EDU>]

On Mon, 22 Sep 2003, Peter Wayner wrote:

> Lately, there has been some discussion on mailing lists and blogs 
> about the fact that srcabmling the oredr of ltetres in Egnilsh deson't 
> afefct raebditly. I decided to write some code to experiment with it. 
> It should be an easy way to store several bits per word and add a 
> watermark to a page.

	Perhaps this is more properly considered steganography.

	The 1st time the algorithm is run, fidelity obviously drops.
	In subsequent runs, however, there is no further quality loss;
	and since re-running the algorithm obliterates all the hidden
	data, the "mark" is completely removable without quality loss.

	This will work as stego in the presence of a passive warden,
	however, which I think is a cooler application anyway.
	You can convince lots of people to write usenet postings in
	garblespeak, implemented using a good RNG/PRNG; this will
	allow the rest of us to write in garblespeak seeded by
	ciphertext, without seeming conspicuous.

	Note that you need the good RNG/PRNG even for non-stego
	garblespeak, or else some sophisticated statistical test
	could identify the steganographic posts.

	                                               -Xcott

	[I envision a future in which Internet censors will do all
	 of our spell-checking for us.  And EE research advances by
 	 leaps and bounds.]





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