[Cryptography] Security of a permute-only system?

[Grant Schultz]

 > From: Henry Baker <hbaker1 at pipeline.com>
 > Subject: [Cryptography] Security of a permute-only system?

 > Given a message source that's already "whitened", but otherwise 
unencrypted,
 > how much security can be achieved strictly through an unknown, but random
 > permutation?

Here's a fellow that seems to be pursuing something along those lines.  
His article plus his references might help.

https://eprint.iacr.org/2015/1033.pdf

Grant Schultz
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