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

[Greg Rose]

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.

>As for A5/3, I'm not really sure what key length network operators are/will be
>using, 64-128 bits are allowed in the design requirements documentation. The
>specification should be available on the 3GPP website. A5/3 is based on 
>Kasumi.

A5/3 will be stuck at 64 bit keys for the forseeable future, due to 
compatibility issues in the protocol. f8 and f9, on the other hand, already 
use 128-bit keys.

regards,
Greg.

Greg Rose                                       INTERNET: ggr at qualcomm.com
Qualcomm Australia          VOICE:  +61-2-9817 4188   FAX: +61-2-9817 5199
Level 3, 230 Victoria Road,                http://people.qualcomm.com/ggr/
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