[Q] Android 4.1.2 Full Device Encryption

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http://forum.xda-developers.com – I have a FDE enabled on my Android. However on JellyBean when device restarts I never get a boot password prompt,just regular unlock screen. I remember on 4.0 ICS, after reboot Android would ask me for decryption key so it can mount the /data filesystem. My device is Moto Droid 4. I verified from command line that /data mounted with encryption, however I cant figure out where it gets the key from,if I never have to enter it on boot. (HowTos)