[Cryptography] stego mechanism used in real life (presumably), then outed

Ray Dillinger bear at sonic.net
Thu Jun 8 18:41:57 EDT 2017



On 06/08/2017 02:23 PM, Richard Outerbridge wrote:
> 
> What if it were to be applied to the texts of received texts, like ”The Gold Bug”?
> 
> Would it come out the same, each time, every time?
> __outer
> 

It would not be easy to implement it so that would be possible without
creating some easily identifiable and reversible patterns.  There is a
tension between the ability to recover the "seed number" that's been
given as an argument to the program and the ability to recover the
verbatim original text.

In theory it's possible, but it would inflate the amount of text you'd
need to identify the serial number considerably, and also mean that the
size of the text would always be strictly increased by the process,
making it easy to identify which version of the document is closer to
the root of the tree.

				Bear


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