[HARDWARE] ongoing work

Matthew Smart mcsmart at engin.umich.edu
Tue Apr 27 15:30:43 EDT 1999

But RC5 is a symmetric algorithm, so decrypting is just as easy as
encrypting.  And you only need to decrypt/encrypt the first block (64 bits)
and compare it against the ASCII representation of "The ", which is the
first part of "The unknown message is: ".

So encrypting "The " and comparing against the given cyphertext should be
the same as decrypting the first block of the cyphertext and comparing
against "The ".


-----Original Message-----
From: owner-hardware at lists.distributed.net
[mailto:owner-hardware at lists.distributed.net]On Behalf Of Darxus
Sent: Tuesday, April 27, 1999 2:13 PM
To: hardware at lists.distributed.net
Subject: Re: [HARDWARE] ongoing work

On Tue, 27 Apr 1999, Matthew Smart wrote:

> I just subscribed to this list.  Are there any people who are actually
> running RC5 cracking hardware they created?  Are there ongoing projects?
> I'm currently working with another grad student to create a Verilog model
> an RC5-32/12/x encrypt/decrypt engine.


> One more question: from the client source code it looks like the clients
> encryption then compare instead of doing decryption.  Any specific reason
> why?

These are all one way encryption.  Unless you break it (which to our
knowledge has not been done), it can not be decrypted.

Your are correct in your interpretation of the code.
PGP fingerprint = 03 5B 9B A0 16 33 91 2F  A5 77 BC EE 43 71 98 D4
            darxus at op.net / http://www.op.net/~darxus
                        Pain makes you real.

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