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From: Stefan Claas <pollux@tilde.club>
Newsgroups: sci.crypt
Subject: Re: Seriation
Date: Mon, 9 Dec 2024 18:29:32 +0100
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Peter Fairbrother wrote:
> On 08/12/2024 19:52, Stefan Claas wrote:
> > Peter Fairbrother wrote:
> 
> > > 21-letter (usually) seriation was used to make both digraph frequency
> > > analysis and transparency analysis harder.
> > 
> > According to the German WWII documentation 17-letters per two lines,
> > a blank line and then again 17-letters per two lines and so on.
> 
> There were variations, but the Army and most others used 21 letters. I
> don't know what the blank lines were.

Well, the reason for the blank line are IIRC not explained in the docs.

Anyways, I came up now with the idea to use hex values, so that
we may come up with some programs, for use in sci.crypt ... :-)

$ echo -n 'Hello sci.crypt! :-)' | xxd -ps | dkhf
48656C6C6F207363
692E637279707421
203A
2D29

$ echo -n 'Hello sci.crypt! :-)' | xxd -ps | dkhf | seriation
46 89 62 5E 66 C3 67 C2 67 F9 27 00 77 34 62 31
22 0D 32 A9

$ dokahex
Tagesschlüssel für den 09.12.2024 (UTC)

Tagesschlüssel 1:
Kasten: A    Kasten: B
0 4 6 A      6 9 E 3
F 1 3 E      7 2 4 D
7 C D 5      1 C 0 5
B 2 9 8      F 8 A B

And to simplify the encryption/decryption process, we could
do it this way. We only mirror from a -> b and b -> a, like:

With the seriation from above and the example box a and b:

Ciphertext: 90 B4 E1 etc.

This doublebox hex variation with only mirroring is IMHO
easy and would allow to transmit small binary blobs. :-)

-- 
Regards
Stefan