Re: VMS coincidence index (vigenere cipher test)

[Santiago Rabanal Garcia <santiago@xxxxxxxxxxxx>]

Hi Caus,
There is one freeware program from the Deutsche Bank 'Cryp tool' that can
solve Vigenere ciphers and other classical ciphers.
Take a look at : http://www.CrypTool.de/
S.

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On Tue, 4 Sep 2001, Anders, Claus wrote:

> Hi all,
> rereading old vms mails today, I read one concerning vigenere cipher. I
> wondered how to solve such ciphers and found a method call coincident index
> on the net. I applied this algorithm to the vms and found, that (after
> removing all ".*,-!%" chars) there is a strong max value for index at 4,5,6
> or 7 ( more than 10% coincidence). This could suggest a key-length from 5 to
> 6 .
> Any comments ?
> Claus
>