Re: VMs: Alphabetical order? Was: The VMS "alphabet" and some other issues...

[Rene Zandbergen <r_zandbergen@xxxxxxxxx>]

--- Philip Neal <philipneal_vms@xxxxxxxxxxx> wrote:

> 1. Divide a plaintext into lines
> 2. Sort the words of each line into alphabetical
> order
> 3. Sort the letters of each word into alphabetical
> order
> 
> E.g.
> 
> 1. one thing led to another thing last night
> 2. another last led night one to thing thing
> 3. aehnort alst del ghint eno ot ghint ghint

I did something quite similar once. Note that step
3 is essentially reversible. Only in rare cases
will several plaintext words be mapped onto the
same code word.
Step 2 is far more difficult to reverse.

> A. The frequency distribution of words and letters
> is the same
> as in the natural language plaintext, but the
> distribution of
> two-letter groups and two-word groups is
> significantly altered.

I did observe at the time that the 2nd order
character entropy goes down, but it does not
go down enough. 

Cheers, Rene

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