Google Account Verification or Factory Reset Protection (FRP) in its new Android OS versions has effectively changed the way we can access phones that are lost-and-found the simple factory reset protocol is no longer enough to unlock the phone. Fast forward to Android Lollipop and succeeding Android OS versions, the story took a different turn. And before the advent of the Android 5.1 Lollipop, this phone would have been easily accessible to whoever found it. Recover Your Google Account on Another DeviceĪ lost-and-found book is as good as a gold bar.How to FRP Bypass Google Lock on Any Android Phone. This is done by feeding your password through a key derivation function.Īfter booting up and being told your password, the phone keeps the derived encryption key in its volatile memory, so it doesn't need to ask for it again - only authenticate you. This is the reason you need to enter your password - it's the only mechanism that we know of that properly fulfills the requirements. The amount of information provided by them is usually small and inexact. Unfortunately, it turns out that systems based on biometrics, such as a fingerprint reader, don't fulfill these properties. A key that is almost exactly the same as the secret key is completely useless Now, because of the nature of this algorithm, a secret key needs to have some important properties: Instead, the device must be told the correct key in order to access your data. When using a properly implemented disk encryption, given just the phone's storage, no one can access your data - not even the device itself! The kind of symmetric encryption used for this purpose uses a secret key, and this key is never stored by the device, for security purposes. This means that all the user data stored on the device is protected by a encryption algorithm. Modern phones feature something called Disk Encryption. If someone inserts the correct pin / password / fingerprint on a lockscreen, the device knows that that person is probably you, and grants you access to the system.īesides authentication, the screen that asks you for your password when you boot up your phone also serves a different purpose. non-secure - recognition is performed by comparing the actual fingerprint with the data stored on the device - this data must be both readable and modifiable which makes it vulnerable to an attackerīecause the fingerprint is only used for authentication, while the password is also used for encryption, and these are distinct processes with very different requirements.Īs you probably know, the primary function of a lockscreen is to make sure that the person accessing your device is you.fuzzy - on each press the sensor provides the device an approximate image of a part of a fingerprint which is matched at a certain accuracy on each verification attempt the actual data differs due to different position, skew, press strength.secure - derived through a one-way function, not "unlocked" by comparing data provided by a user with a pattern stored on the deviceįingerprint recognition does not meet the above requirements, it is:.accurate - on each entry, the device must transform the password through a key-derivation function into the one and only correct encryption key, otherwise the device won't be able to decrypt the data.fingerprint is used to unlock the screen (of an already "decrypted" device).password is used to get access to the full disk encryption key.
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