[rc5] Possible further d.n projects.
brianm at earthlink.net
Thu Oct 23 21:32:09 EDT 1997
First, I'd like to preface this by saying "I'm no crypto guru, but:"
Lets look at the previous plaintexts for the RC5/40, RC5/48, RC5/56,
and DES challenges.
RC5/40: The unknown message is: This is why you should use a longer key
RC5/48: The unknown message is: The magic words are Security Dynamics and RSA
RC5/56: The unknown message is: It's time to move to a longer key length
DES: The unknown message is: Strong cryptography makes the world a
Hrm. I'm noticing alot of similarities here. There seems to be a
very common theme. Again, I'm no crypto guru, but if I were to mount
a chosen plaintext attack, all of these words would be on my list.
Doesn't it seem fairly likely that RSA has done something
*relatively* similar in at least one more of these contests? Look at
how amazingly similar the RC5/40, and RC5/56 bit messages were.
What is the feasibility of mounting a chosen plaintext attack
against the other challenges? If feasible, it would *certainly* be
less computationally challenging than a brute force attack. Am I
missing something, or would it be *DAMN* cool to announce that we'd
just solved RC5/90 ?
On another note, I think attacking RSA-155 sounds like a worthy
effort. It sounds a hell of alot more useful than kicking Kasparov's
ass at chess(although it would be kinda groovy to say
..."Kasparov? What a wuss.."
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