It is quite common to come across a locked mobile phone in case investigations. How to bypass the screen’s lock presents a challenge towards digital forensic investigators. This article focused on bypassing the locked screen of Android smart phones. Three different types of Android passcodes, gesture, PIN code and complex, were introduced along with their storage principle and file structures. To make the brute forcer successfully get the pattern code depended on acquiring the passcode key file. Bypassing the screen lock could be achieved by using ADB (Android debug bridge). Two different approaches to solve the problems on getting passcode were suggested with the conditions of mobile phone’s USB debugging mode at on or off. When USB debugging mode was on, investigators could try to gain root access into the phone and apply adaptable method to decrypt or remove the screen lock. But if the USB debugging mode was off, the custom recovery method could be used to flash on the phone

Bypass for Screen Lock of Android.pdf

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