ElcomSoft’s Phone Password Breaker toolkit is designed to work on the iPhones 3GS and iPhone 4 (including both GSM and CDMA models), first-gen iPad, and 3rd and 4th gen iPod touches running iOS 4.x and it provides real-time access to most information. The software is released in two modifications – one commercially available password decoder and the other, restricted to government and forensic agency use, capable of determining the numbers used to create encryption keys for stored data.
Apple introduced hardware encryption with its iPhone 3GS granting business better security, and further improving with iOS 4.x. ElcomSoft’s solution is GPU-accelerated and can decode the iOS backups, but to do that you’ll need to have access to the device. If a user chooses not to encrypt backups in iTunes it’s even easier to gain access to contact and login information.
source: ElcomSoft via Ars Technica