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 > _______________________________________________ > A51 mailing list > [email protected] > http://lists.lists.reflextor.com/cgi-bin/mailman/listinfo/a51 _______________________________________________ A51 mailing list [email protected] http://lists.lists.reflextor.com/cgi-bin/mailman/listinfo/a51
