Message Boards Message Boards

2
|
10209 Views
|
6 Replies
|
4 Total Likes
View groups...
Share
Share this post:

Vigenère cipher/Cryptanalysis

Posted 9 years ago
POSTED BY: Luis Ledesma
6 Replies
POSTED BY: Daniel Lichtblau

And other functions who might be useful are:

ResourceFunction["VigenereDecipher"]
ResourceFunction["VigenereCipher"]

(and yes, years after the fact as well)

POSTED BY: Sander Huisman

Sander, does all this necromancy make us, umm, "visionaires"?

POSTED BY: Daniel Lichtblau

I guess so :-) !

POSTED BY: Sander Huisman

Your position differences for the four times repeated trigram "XJE" are all divisible by 14. All but one difference for the thrice-repeated trigrams is divisible by 14. I think I would assume that one was an accidental repeat (due to actually different plain text trigrams getting the same encoding). So expect a key length of 7 or 14 because 2 is too short. Also there is no reason to ignore the doubly-repeated cases, and they might give similar information (I have not checked).

POSTED BY: Daniel Lichtblau
Posted 9 years ago
POSTED BY: Luis Ledesma
Reply to this discussion
Community posts can be styled and formatted using the Markdown syntax.
Reply Preview
Attachments
Remove
or Discard

Group Abstract Group Abstract