you can tell the keyspace covered by a table from the sorted.table file in the torrent. if it lists 32 rounds then the average chain length is 1 million, with 8 rounds it is 256 thousand. Look at the startbits value and calculate the number of chains: filesize(sorted.start.tbl) * 8 / 53. Then you have the value for a single table. multiply that by the number of tables available and you have the size of the covered keyspace. as a rule of thumb: 8 GB torrents are 8 rounds and 760M chains, so 760M * 256k = 2^47.5 2GB torrents are 32 rounds and 190M chains, so 190M * 1M = 2^47.5 The initial table parameters said to generate 380M chains and would cover 380M * 1M = 2^48.5 and be about 4GB in size.
i know of at least 32 tables lying around which would provide a coverage of 2^52.5. so with only those tables you need 2^63 / 2^52.5 = 2^10.5 64bit samples for 50% success. 2^10.5 samples can be gathered from 28 fully known GSM bursts (7 fully known plaintext LAPDm messages). On Mon, Dec 28, 2009 at 08:57:20AM +0000, p q wrote: > do you have estimate how much tables have been generated successfully ? how > far we are from the point that having 50% success is guaranteed? > > > From: sascha <[email protected]> > > Date: Mon, Dec 28, 2009 at 8:44 AM > > Subject: [A51] A51 torrents > > To: [email protected] > > > > > > The torrents for completed and sorted tables are being made available > > at http://reflextor.com/torrents > > More will be added as they come in. > > Of course they are fastest to access at the congress building, but i > > suggest you download what you want to have in the next few days to > > take advantage of the big congress uplink capacity. > > _______________________________________________ > > 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
