[EXT] Re: Help with OTP encryption

[Zdenek Wagner]

Hi Andrew,

if I understand your original mail, what you need is a slight
modification of Vernam cipher. Modules for Vernam cipher should be
available in many programming languages.

Zdeněk Wagner
http://ttsm.icpf.cas.cz/team/wagner.shtml
http://icebearsoft.euweb.cz

st 19. 5. 2021 v 11:45 odesílatel Philip Taylor
<P.Taylor at hellenic-institute.uk> napsal:
>
> N. Andrew Walsh wrote:
>
> Hi Philip,
>
> On Wed, May 19, 2021 at 10:54 AM Philip Taylor <P.Taylor at rhul.ac.uk> wrote:
>>
>>
>> How could this be ?  You say "each character has been converted to one of 52 two-digit numbers (so, 01 through 52)" but [a-zA-Z] of itself will require 52 such numbers, so what numbers are assigned to [0-9 . , ; : ! ? \textemdash ...] ?
>
>
> Well, for one, I'm ignoring capitalization. But again, that part of the conversion has already been done, and requires no further work. All I need is to convert the resulting two-digit numbers into *other* two-digit numbers, using the keytext.
>
>
> I will try once more, Andrew, but to be honest I am rapidly losing interest, as trying to get accurate information from you regarding the earlier stages of your processing is proving extraordinarily difficult.
>
> So let me ask one simple question — if there were a processing engine E that took as input your ciphertext.tex and keytext.tex files and sought to produce your codetext.tex file, would that engine E need any knowledge at all as to which fragments of ciphertext.tex represent TeX-specific constructs such as \footnote ?  If so, why ?  Why can it not operate on ciphertext.txt with no prior knowledge at all as to what its contents might represent ?
> --
> ** Phil.