Hi,
Sorry for my late reply, as it is Christmas!! and i have a family meeting.
The presentation is 100% original, and the eprint of the full/complete attack
details will be publish soon.(Check http://eprint.iacr.org/)
I have more than 150 emails to reply, as i am part of the cryto scene, and i
have researchs on AES256, and other well-known algorthyms. So, be patient!.
The attack is based on KASUMI (new variant of old misty1 paper that i also
added to some of the people here ny email).
We need to investigate to port this attach to 3G cell (which is a variant
designed exclusively for phone communication).
The attack works great on a computer simulated case, and gives us a chance to
have some seconds of a conversation (pattern) to start the decryption process
(it is used by NSA specialists nowadays).
Javier
> Date: Fri, 25 Dec 2009 17:01:05 +0100
> From: [email protected]
> To: [email protected]
> Subject: Re: [A51] Kasumi
>
> What is meant by a plaintext sample is not said in the presentation,
> but i assume it is at least a 64bit block.
> that 2^29 bytes and way longer than any actual conversation.
> so for 3g networks where known plaintext comes in the form of low
> bandwidth control channels it is not a practical attack, assuming
> that the kasumi key is different for each connection of the same
> handset.
>
> On Fri, Dec 25, 2009 at 07:20:29PM +0330, p q wrote:
> > 2^26 is a very low figure . it means a couple of seconds of a conversation ,
> > if we have already determined there is enough known plain text there
> > i think the attack they have presented is focused on Kasumi itself , not the
> > way its used in 3G based networks . the description they used is very
> > similar to what is announced about this very same project we are working on
> > . cracking A5/1 us not equal to cracking GSM . people should really pay
> > attention to these tiny yet important details
>
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