Do we know how phones handle the fill bits in bursts? If mobile phones do not care whether these are coded as "2B" or as random blob, then they could start putting random bit streams in the fill bits. This would significantly reduce the known plain text, and thus the number of 64 bit known key stream samples. I have not yet checked all the messages that are now known to be known, and seen how much of these messages consist of fill bits. But it could be a way to guard against this attack.
Fabian 2010/1/9 Clemens Gruber <[email protected]>: > I dont think that there is a possibility to improve the security without > replacing the hardware (bts or AC and cell phones all around the > world).. > > In my opinion, the security director of the GSMA, Thomas Moron, is just > trying to calm down the masses. Most journalists do not question his > statements.. > > On Fri, 2010-01-08 at 15:24 +0100, Ronald wrote: >> People should not worry, just a slight change will do the thrick. >> Any ideas where they are referring to? >> . >> >> Cellular group says mobile calls safe from hackers >> >> BOSTON (Reuters) – A wireless industry group said mobile phone >> conversations are safe from eavesdropping, even after a German >> security expert released the code for unscrambling calls made using >> most of the world’s cell phones. >> >> Concerns spread last week that cell phone calls could easily be >> intercepted after encryption expert Karsten Nohl unveiled his research >> at Europe’s largest hacking conference, in Berlin. >> >> The London-based GSM Association said on Thursday that it has spent >> the past few years figuring out ways to thwart hackers who might try >> to tap into wireless calls using Nohl’s research, which it first >> learned of in 2007. >> >> GSM Association engineers have figured out a short-term solution to >> block eavesdroppers, said James Moran, head of security for the >> association. It involves making slight changes to the settings in each >> wireless operator’s network. >> >> Just a slight >> _______________________________________________ >> 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 > _______________________________________________ A51 mailing list [email protected] http://lists.lists.reflextor.com/cgi-bin/mailman/listinfo/a51
