The process itself is quite fast, after watching the talk I'd guess 3 minutes for singling out a single phone via sending SMS, and maybe 2 minutes for cracking

The process itself is quite fast, after watching the talk I'd guess 3 minutes for singling out a single phone via sending SMS, and maybe 2 minutes for cracking the key itself. The software is indeed very specialized, and according to the guy doing the demo it will be released, but without the last polishing to run the attack on an actual live network, but claims that it took him less than 1 week of work to come from currently published code to the stuff he's shown in the attack. But of course to come to the level of expertiese of Sylvain Munaut will take a mere mortal more than a year of studying GSM... ;-)