iOS 5 Support
When developing the iOS 5 compatible version of iOS Forensic Toolkit, we found the freshened encryption to be only tweaked up a bit, with the exception of keychain encryption. The encryption algorithm protecting keychain items such as Web site and email passwords has been changed completely. In addition, escrow keybag now becomes useless to a forensic specialist. Without knowing the original device passcode, escrow keys remain inaccessible even if they are physically available.
What does enhanced security mean for the user? With iOS 5, they are getting a bit more security. Their keychain items such as Web site, email and certain application passwords will remain secure even if their phone falls into the hands of a forensic specialist. That, of course, will only last till the moment investigators obtain the original device passcode, which is only a matter of time if a tool such as iOS Forensic Toolkit is used to recover one.
What does this mean for the forensics? Bad news first: without knowing or recovering the original device passcode, some of the keychain items will not be decryptable. These items include Web site passwords stored in Safari browser, email passwords, and some application passwords.
Now the good news: iOS Forensic Toolkit can still recover the original plain-text device passcode, and it is still possible to obtain escrow keys from any iTunes equipped computer the iOS device in question has been ever synced or connected to. Once the passcode is recovered, iOS Forensic Toolkit will decrypt everything from the keychain. If there’s no time to recover the passcode or escrow keys, the Toolkit will still do its best and decrypt some of the keychain items.
Besides adding support for the latest iOS 5, Elcomsoft iOS Forensic Toolkit becomes 2 to 2.5 times faster to acquire iOS devices. When it required 40 to 60 minutes before, the new version will take only 20 minutes. For example, the updated iOS Forensic Toolkit can acquire a 16-Gb iPhone 4 in about 20 minutes, or a 32-Gb version in 40 minutes.