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From: Stefan Claas <pollux@tilde.club>
Newsgroups: comp.security.unix,sci.crypt
Subject: Re: Patterns
Date: Fri, 16 Feb 2024 17:57:32 +0100
Organization: i2pn2 (i2pn.org)
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Xref: csiph.com comp.security.unix:237 sci.crypt:257281

Chris M. Thomasson wrote:

> On 2/15/2024 12:20 PM, Stefan Claas wrote:
> > Rich wrote:
> > 
> >> In sci.crypt Stefan Claas <pollux@tilde.club> wrote:
> >>> Chris M. Thomasson wrote:
> > 
> >>>> Or even the other way around? If one knows the OTP (Bob and/or
> >>>> Alice), they can create a special plaintext that generates this
> >>>> output for fun.
> >>>
> >>> How would you do this?
> >>
> >> For a traditional, 1940's substution style OTP, it is trivial:
> >>
> >> Message: The
> >>
> >> Pad:
> >>
> >> T=H
> >> e=r
> >> h=e
> >>
> >> Substitute using the pad, get the encrypted message: Her
> > 
> > Well, one uses a substitution table, trigraph, etc. and then
> > a pad to encrypt the message. Otherwise it would be a plain
> > text encoded message, right?
> 
> Give me a OPT 3 bytes long. Creating a plaintext that results in a 
> ciphertext of say 123, or ABC is possible...

Yes, but then it is not OTP encryption and only plain code, done
with substitution, I would say. The OP's Subject: is Patterns.

Regards
Stefan
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