VMs: Re: "Running encoding" -- Used in period? Properties?

["Jeff" <jeff@xxxxxxxxxxxxxxxxxxxxxx>]

elvogt@xxxxxxxxxxx Wrote
On 20 February 2004 09:55

Now this nas promise! Elmar I would pursue this if I were you.

Jeff

>
> Hello all,
>
> Inspired by Steve's "Fold the vellum" paradigm, I wondered about some kind
> of "running encoding" of any text. (Don't know if that's the right term --
I'll
> just call it that.)
>
> The idea is essentially to write down a table of your cleartext letters:
>
> A B C D E
> F G H ...
>
> Or scramble the letters, as you please.
>
> Now what you write down is not the sequence of letters, but their relative
> positions.
>
> Eg to encode "Bee", you would write
>
> "Jump to 1st line, 3rd column
> Move 2 cells to the right
> Repeat last letter"
>
> how to reach every letter from the previous cell.
>
> Now you encode this _instructions_ how to jump from table cell to cell.
> (Essentially, you've got some 26 different moves, so for each move you
could
> invent one particular symbol. Hint hint.)
>
> The funny thing about this would be that different letter sequences could
be
> mapped to the same encoded sequences (eg every doubled letter "tt", "ee",
etc.
> would be transformed into a jump-instruction and always _the same_
"Repeat"-
> instruction).
>
> Now the questions --
>
> I browsed some period encoding schemes, but didn't find anything like
that. Is
> it true that none of these "running encoding" schemes was ever used? (I
> understand they would be vulnerable to the loss of individual letters, but
you
> could recover by introducing codes to "synchronise", ie to give you
absolute
> rather than relative positions again.)
>
> Off the top of your head, what would the statistical properties of a text
> encoded that way be? Could this possibly explain the high repetivity of
the VM,
> provided the right code table was used?
>
> Just a thought during a slow day at work,
>
>    Elmar
>
>
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