re encryption

Unfortunately there is a major flaw with all forms of encryption, mainly that all it takes to break is time. you probably won't ever be able to listen in on an encrypted VOIP call in realtime but you can record it and decrypt it later.

I remember some details from part of an Information Systems course i did, quite a while ago, which detailed different types of encryption and the average time they took to crack. i think 128k (ie what most browsers use for your credit card details) took a couple of months on a home pc, a week or so on a corporate system and about 5 mins on a govenment code breaking system. And this was before home pc's broke the 1gb limit (in fact i think they had yet to push 500mhz), I can only imagine with todays systems that they can't be far off the corporate systems of the time if not surpassing them.

certainly the lessons learnt from the wpa wireless encryption shows that most modern pc's can crack it withing minutes