Re: VMs: Word Endings

["Jeff" <jeff@xxxxxxxxxxxxxxxxxxxxxx>]

I have just looked up Vigenere tableau and see what you mean. This method
however does not need the plain text cipher. It is a variation that can
decode itself using letter pair chains. It basically moves around the table
depending upon which cipher text character you last wrote. So if my table
was:

ABCDEFGH
BCDEFGHA
CDEFGHAB
DEFGHABC
EFGHABCD
FGHABCDE
GHABCDEF
HABCDEFG

And my indexes were ABCDEFGH Along the top
And HGFEDCBA down the side (backwards alphabet)
And the text I wanted to endcode was BAD CAD:

I would find the letter B within the grid. Then I would find the cipher text
characters for the column and row that the B was in. I would write these
column first then row. so if B was in column C and row H I would write CH.
Then I would look along row H for the letter A in bad. This is in column B
so I write B giving me CHB. I now find D in column B. This is row C so I
write C giving me CHBC. Now I have to write a space. Unless I want to add
confusion, but why would I with this method? Now I find C in row C. This is
in column A so I write A giving me CHBC A. I then find A in column A. This
is in row A so I write A giving me CHBC AA. Lastly I find D in row A. This
is in column D so I write D giving the final cipher CHBC AAD.

If I had chosen any other starting position the pattern would have been
radically different. Same plain text.

Decoding is childs play. Each character pair maps to one and only one plain
text character. Yet each plain text character maps to x number of cipher
pairs.

>
> Correct me anyone, if you think I'm wrong, but what Jeff is describing
here
> is a first-character-initiated (non-keystring) auto-keyed look up table
> constructed from a standard Vigenere tableau.  Before you get too excited
> about this idea Jeff, I suggest you enact your ideas on a standard
construct
> and view the results.  I'm not certain if I ever checked for this in the
> past, but I'm certain that auto-key cannot be responsible for the VMS text
> statistics.  Auto-key leaves a signature that I don't see present in the
> VMS.  Of course, I've been wrong before, will be wrong again, and oftimes
> rejoice in my own dim light.  Google auto-key cipher, and find out about
> what you're testing.... and keep us informed on your discoveries, always!
>
> GC
>
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