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It's not possible to find arbitrary digits of the pin. It's an all-or-nothing deal. Assuming a numeric pin, there are 10,000,000 possible combinations. Depending on the implementation of the key derivation algorithm, it may take up to ~1s per attempt - that's roughly 58 days before you have a 50% chance of hitting the correct key, with 116 days (almost 4 ...

Bitlocker is vulnerable to much the same attack. This paper describes an attack against the PIN: "At the next boot, the MBR boot loader loads this file and transfers control to it. A fake BitLocker prompt is displayed (see figure 1); the entered PIN is stored in the NTFS partition, the original MBR is restored and the system rebooted. Later, the entered PIN ...