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From: Rich <rich@example.invalid>
Newsgroups: sci.crypt
Subject: Re: Speaking of long-ish passwords
Date: Thu, 20 Jun 2024 16:02:03 -0000 (UTC)
Organization: A noiseless patient Spider
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Cri-Cri <cri@cri.cri.invalid> wrote:
> A new idea to solve the problem with a secret (well, now not so secret) 
> code scheme, one that you don't have to keep hiding. Here we can hide it 
> in plain sight. :)
> 
> Go here, It's a Sudoku game:

Interesting idea.  One could even obtain a paper sudoku book and 
"solve" a portion of the games, with one preselected one being "filled 
in" for the key one is transporting.  Most "police" types are not 
likely to look twice at a paper sudoku book, and certianly are not 
going to "verify" that the partially solved puzzles are all correctly 
solved.

And, if one was worried that some stazi type might "verify" the puzzles 
for correctness, then just solve ~ 50% of the puzzles in the book 
correctly, and choose one of those 'correct' puzzles to be the source 
for the 'key'.

And key source can also be obsfucated somewhat, in that one could 
combine the numbers in a pattern (zig-zag, circular, etc., i.e., 
anything other than left to right top to bottom).