Re: classical crypto programmatic aids

2006-06-29 Thread Max A.

Travis,

Take a look at http://www.cryptool.com/

Regards,
Max

On 6/27/06, Travis H. [EMAIL PROTECTED] wrote:

Hi folks,

Does anyone here know of any computer-based aids for breaking
classical cryptosystems?  I'm thinking in particular of the ones in
Body of Secrets, which are so short that I really hope they're
monoalphabetic substitutions.  But I'm interested in these sorts of
programs more generally.  I could use paper, but it'd be nice if a
computer could keep track of what I've tried and otherwise ruled out.
I am aware of the crypt breaker's workbench, but that's specific to
classic Unix crypt(3).  What else is there?

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Re: classical crypto programmatic aids

2006-06-29 Thread lists

Travis,

 Does anyone here know of any computer-based aids for breaking
 classical cryptosystems?  I'm thinking in particular of the ones in
 Body of Secrets, which are so short that I really hope they're
 monoalphabetic substitutions.  But I'm interested in these sorts of
 programs more generally.  I could use paper, but it'd be nice if a
 computer could keep track of what I've tried and otherwise ruled out.
 I am aware of the crypt breaker's workbench, but that's specific to
 classic Unix crypt(3).  What else is there?

In the 1990s Remo Pini (Pini Computer Trading, Switzerland) was distributing
a crypto CD with such things on it.  At the time his address was [EMAIL 
PROTECTED]
and google suggests some more recent addresses.
 
 Incidentally, if anyone's interested, on my web page I have an article
 on how I used classical techniques to recover files encrypted with CFS

I thought that was interesting and it's living in my magazine pile.


GCHQ issue a puzzle occasionally (looks like twice a year)
http://www.gchq.gov.uk/codebreaking/index.html
and I tackled the December 2004 one
http://www.gchq.gov.uk/codebreaking/challengedec04.html
like this
http://www.notatla.org.uk/CRYPTO/gchq_puzzle/index.html
using a program of Paul Leyland's off the Pini CD.



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classical crypto programmatic aids

2006-06-28 Thread Travis H.

Hi folks,

Does anyone here know of any computer-based aids for breaking
classical cryptosystems?  I'm thinking in particular of the ones in
Body of Secrets, which are so short that I really hope they're
monoalphabetic substitutions.  But I'm interested in these sorts of
programs more generally.  I could use paper, but it'd be nice if a
computer could keep track of what I've tried and otherwise ruled out.
I am aware of the crypt breaker's workbench, but that's specific to
classic Unix crypt(3).  What else is there?

Incidentally, if anyone's interested, on my web page I have an article
on how I used classical techniques to recover files encrypted with CFS
and corrupted by disk failure or human error.  It's sort of a rambling
stream-of-consciousness that I wrote while learning CFS and breaking
the encryption.  It's not often that one gets to use classical methods
against a modern cryptosystem, so I figure it may be refreshing.  To
summarize, CFS XORs each file against an eight-byte IV that is stored
as a dangling symlink, and on my system the symlinks had become
desynchronized from the files.

PDF: http://www.usenix.org/publications/login/2004-08/pdfs/howard.pdf
TXT: http://www.lightconsulting.com/~travis/cfs_travails.txt
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