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What is the strength of the key derivation function on Android device encryption?

What is is strength of the key derivation? Specifically, how many milliseconds or microseconds would it take a desktop computer to check a guessed password to see if it is a match? I am aware this ...
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7answers
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Are there actually any advantages to Android full-disk encryption?

So, since Android 3, devices can perform boot-time, on-the-fly encryption/decryption of the application storage area (NOT the SDcard/removable storage) - essentially full-disk encryption. This ...