RSA's RC5-64 Secret Key Challenge has been solved.

[Bill Stewart]

At 03:02 AM 09/28/2002 +1000, Greg Rose wrote:
>At 01:16 PM 9/27/2002 +0200, Ralf-P. Weinmann wrote:
>>Is A5/3 deployed yet?
>
>Kasumi (in the form of "f8" (ciphering) and "f9" (integrity) is
>beginning to be deployed in UMTS (WidebandCDMA) mobiles as we speak.
>But an exact specification of how to use Kasumi as A5/3 has only
>just been agreed; it will be 6-12 months (at least) before any
>significant amount of equipment, either fixed or mobile,
>will be produced and deployed, and it will be a couple more years
>after that before there will be significant probability that a
>call is encrypted using A5/3.

That might make this a good time to attack the 64-bit version,
at least if there's been enough cryptanalysis done for the
attack to be realistic.


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