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Android Factory Data Reset Doesn't Wipe Data Completely; Login Keys And Data Intact

Researchers at the Cambridge University recently discovered that the factory data reset feature on Android doesn't work as well as advertised. If you thought that simply hitting the factory data reset button on your Android device did the job, you're about to find your worst fears come true.

The researchers found that even with full-disk encryption enabled, they were able to recover the file that stored encryption keys even after performing a factory reset. They then proceeded to recover the "crypto footer", using which they decrypted the device using a brute-force method to find the user's PIN.

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