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From: Rich <rich@example.invalid>
Newsgroups: sci.crypt
Subject: Re: Seriation
Date: Sun, 8 Dec 2024 05:58:45 -0000 (UTC)
Organization: A noiseless patient Spider
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Stefan Claas <pollux@tilde.club> wrote:
> Peter Fairbrother wrote:
>> Seriation is not a cipher, it is a technique used to build ciphers. Like
>> substitution and permutation, of which it is a form of the latter.
>> 
>> It can be useful eg with digram-based ciphers like Playfair, where it
>> makes cryptanalysis based on the known frequency of occurrence of
>> digrams in the plaintext language much harder or impossible.
> 
> Yes, thank you for the explanation! It could also be a nice replacement
> for SCOS, here in sci.crypt, combined with an A-Z encoder/decoder and a
> padding program, since SCOS was cracked and floating around on Bitmessage
> and code for seriation I have not seen yet elsewhere.

SCOS was never meant to be in any way 'secure'.  Hense the name: (S)ci 
(C)rypt (O)pen (S)ecret.  It was meant as a fun exercise at 
cryptanalysis and working out a crypt/decrypt algorithm given examples 
of encrypted messages.

> Maybe worth a little challenge, to have such a format for sci.crypt, 
> with an AZ encoder, a pad and seriation program.  :-)

And why would you think it would not also eventually be "cracked" and 
"floating around on bitmessage" after some time?