Researchers bypasses Google’s data scrambling encryption system introduced in Android 4.0 Ice Cream Sandwich to reveal the phone’s hidden data. Using a new attack on most popular Android phones platform, a team of researchers in Germany managed to grab stored cryptographic keys if the device is frozen state for an hour. The team developed software called FROST, Forensic Recovery of Scrambled Telephones, which lets them copy data from the phone for analysis on a computer. They discovered that quickly connecting and disconnecting the battery of a frozen phone forced the handset into vulnerable mode.
Source: https://thehackernews.com/2013/03/frozen-android-phones-attack-to-grab.html