> Elad Barkan and Eli Biham (them again) filed a patent which was made
> public 2 months ago. It appears to be a new attack against A5/1:
>
> http://www.google.com/patents/US8295477
I've just did a quick scan through it and didn't really see what's
"new" about it ...
The abstract seems to describe the very well known A5/2 attack and
it's optimization. They also describe in the invention the classic
downgrade attacks (sinceit all A5/x share the same Kc, you attack A5/2
or A5/1 using an imsi catcher and reuse the found Kc to decrypt
intercepted A5/3 data for eg).
Can you pin point exactly what "new" about it ?
AFAICT it's just the exact stuff they published 10 years ago ...
Cheers,
Sylvain
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