Nohl worked diligently with others around the internet and ultimately created a guidebook. He published the secret code used to encrypt most of the world’s digital mobile phone calls – exposing the loopholes surrounding its weakness. Fortunately though, 3G networks utilize a 128-bit encryption along with a new A5/3 algorithm which is being “phased in” according to GSM Association spokesperson Clair Cranton. All of the efforts placed into this was not to just break the code, but to have better security so that it would be virtually impossible to do so.
source: NY Times via Mobile Tech Today