Kashif,
Have a look at this post
http//www.forensicfocus.com/Forums/viewtopic/t=11524/
Android phones with encrypted containers already exist.
Regards
MPF
Bundle of thanks MobilePhoneForensic
I already posted a reply there.
Basically I want to do research in some area which has some commercial significance.
Blackphone and Boeing black are using customized android os , while i want to use native android
and change its applications to meet privacy demand.
I wish to create an app and present as a research project.
e.g. you will have two phonebooks in your mobile.
One native phonebook, other encrypted privacy pro phonebook
2nd can be set as a default phonebook
Blackphone is 625 $ , i will make my app free. )
Why are you trying to re-invent the wheel? The absolute best "antiforensic" technique, is full disk encryption - which Android offers (dmcrypt LUKS AES128 CBC). To make it more of a nightmare, use a Nexus device and root it, then install EncPassChanger and change the pre-boot passphrase from the OS limitation of 16 characters max (which is also the screen unlock code) to, oh, how about 32 or 64 characters? LOL. You can also re-lock the boot loader with another app. Not even Chip Off or JTAG will help if they get the phone in a powered down state.
If you're worried about the phone being ripped out of your hand while running unencrypted, there are projects out there that are in beta, using a TrueCrypt like "Hidden OS" on Android. But it ain't gonna be done with a single app.
A little late to the thread but this guy's MSc thesis touches on the subject of anti-forensics and privacy through encryption on Android phones. Basically, he designs a way to create a hidden partition within the original partition of the Android file system.
Read more here http//