[icq-devel] Odigo [off-topic]



Dan Ackerman baldrick at dilbert.netset.com
Thu Dec 13 15:15:38 CET 2001


On Thu, 13 Dec 2001, Sami K Makinen wrote:

>
> How would you even go about cracking some unknown cipher that could be
> basically anything at all? How was the ICQ "cipher" cracked? Did somebody
> from Mirabilis leak it? Certainly the ICQ (at least V5) cipher isn't
> exactly complicated, but still how do you figure that out if you have
> nothing to go on?
>
> -Sami
>

	A good start is to send messages with simple contents and then
analyze the differences.  Send a message with 60 '0' and then a message
with 60 '1' etc.  This might give you an idea of what is going on.  Once
you have some sort of idea, send yourself repeat messages with the same
contents and see how they vary.  Eventually you should discover some sort
of pattern about the construction of the packet.

Dan Ackerman
aka baldrick at netset.com





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