[A51] Query - Use of Kraken with CPUs

Joel Eriksson joel.eriksson at gmail.com
Thu Mar 27 17:25:20 CET 2014

On Thu, Mar 27, 2014 at 5:00 PM, Nikos Balkanas <nbalkanas at gmail.com> wrote:

> On Thu, Mar 27, 2014 at 5:08 PM, Joel Eriksson <joel.eriksson at gmail.com>wrote:
>> It is the AMD IL code that needs to be updated, to GCN assembly .. It
>> would be possible to code it in OpenCL as well, but the whole point with
>> coding it in AMD IL to begin with was to make use of certain instructions
>> to make it more efficient. OpenCL code would most likely have a
>> significantly lower performance (but would obviously be better than
>> nothing). The C++ wrappers around may need to be modified slightly as well,
>> but that change is trivial.
> They will have to. Ubuntu 13.04 is EOL and 12.04 will be in 3 weeks, when
> the new 14.04 comes out. They told me that right know they support only
> Ubuntu 12.04 and 13.04. That's after
> they crashed my X-server and trashed my installation with their latest
> catalyst :-(

Huh? They will have to what? Ubuntu versions and life spans has absolutely
nothing to do with this.

> Hold on a minute. Kraken is not limited to A51 code. Are you saying that
>>> the rainbow tables are built with A51 encryption in them?
>>> If that is the case, there is a project openrainbow tables, that
>>> maintains them and maybe takes care of it.
>> Yes, Kraken is limited to A5/1. What made you think otherwise?
> Several comments by hackers around the web, saying that it could be used
> to crack 3G & 4G networks. Didn't answer my question though ;-)
> Kraken is a general rainbow table matcher. It is the source Rainbow tables
> that determine the context. If there are A5.3 tables, kraken can work
> with A5.3. Right? I haven't seen any A5.1 code in Kraken.
> BTW the project I was referring to is called Distributed Rainbow tables,
> not Open.

No, Kraken is far from a "general rainbow table matcher". The tables used
by Kraken are not even rainbow tables, it is an application specific TMTO
(time-memory-trade-off) combining rainbow tables and distinguished points
to efficiently attack A5/1. If you haven't seen any A5/1 code in Kraken,
you have not looked close enough.

Joel Eriksson
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