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From: David Entwistle <qnivq.ragjvfgyr@ogvagrearg.pbz>
Newsgroups: sci.crypt
Subject: Re: Seriation
Date: Tue, 4 Feb 2025 01:31:52 -0000 (UTC)
Organization: A noiseless patient Spider
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On Mon, 3 Feb 2025 10:17:24 +0000, Richard Heathfield wrote:

> #define UPPER "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
> #define LOWER "abcdefghijklmnopqrstuvwxyz"
> #define DIGIT "0123456789"
> #define PUNCT "!\"$%^&*()_-+={}[]#~'@;:/?.>,<\\|"
> 
> which isn't particularly wide, but any encryption of any of those
> characters will *always* produce a character drawn from the same set.
> When faced with something *not* from that set, SCOS leaves it unchanged.
> So I think I'm right in saying that by the above definition SCOS /is/
> closed.

Yes, as I recall, and as a rather sloppy adversary unaware of your 
implementation, my character set ran from char(33) ! to char(126) ~. I 
think it was the gap between char(95) _ and char(97) a which caused me the 
most trouble. char(96) is top left on a QWERTY keyboard. I never use it, 
but it gets used as an apostrophe in some text on the web. As a result 
some of my checks failed to do what I expected and I didn't feel confident 
posting SCOS-based ciphers.

Happy days though.
-- 
David Entwistle