Re: Seriation

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?