2015年12月18日

Code dictionaries...?

From: Nick Pelling
•Date: Wed, 09 Oct 2002 13:04:19 +0100

From my research, I believe that the VMS was written in Northern Italy (influenced by both Milanese and Florentine cultures) around 1460, and *without* the aid of complex cryptography.

Given this, here's my current hypothesis about the structure of its code/cipher. I predict:
(1) It's essentially a "dressed up" Florentine number code
(2) The numbers are expressed in Roman numerals
(3) Those numerals are hidden using a mixture of steganography and stenography
(4) Gallows characters are based loosely on the idea of the Cistercian number cipher
(5) Non-dictionary words are typically anagrammed
(6) words express simple quantities
(7) Any extra letters required are simply thrown into the mix, perhaps in a verbose way

It may well be that the dictionary itself is simply encoded (perhaps in some anagrammatic or every-other-letter form) in the final section at the back. This would seem to be the simplest explanation.

Plainly, number codes can't be decoded using cipher cryptology: nor can they be decoded if you can't even read the numbers. :-) I believe that this is the reason why this hasn't been cracked.

However: while the idea of a "dressed up" number code has often been proposed on-list, are there any Italian number code dictionaries from about 1400-1500 still in existence that we could compare it against?

I'd be interested to see if they share any structural elements... for example, common words having low index values (for quick writing, similar to Morse code), etc. Or if there was a perceived upper limit to the size of those dictionaries - 50 words? 100 words? 200 words?
posted by ぶらたん at 15:46| Comment(0) | 暗号
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