I know nothing of CDMA and outside of some basic knowledge (I worked on the iPhone dev team during the original push for an unlock, and picked up some info on h

I know nothing of CDMA and outside of some basic knowledge (I worked on the iPhone dev team during the original push for an unlock, and picked up some info on how GSM and cell phones in general work) I know very little here, but from a general security standpoint, the "only X and Y know the key for Z, thus Z is more secure than W" approach doesn't hold up. If there's a flaw in the implementation of crypto, it may be possible to reconstruct the key, or circumvent it entirely. That it hasn't been done yet means little in terms of theoretical security.