On the iphone, the file system is always encrypted, and the encryption keys are stored on the device, themselves being encrypted with your PIN/passphrase. To pe

On the iphone, the file system is always encrypted, and the encryption keys are stored on the device, themselves being encrypted with your PIN/passphrase. To perform a remote wipe, it only needs to zero out this single block containing the FS keys, making the whole FS unrecoverable since the keys are gone. I wonder if the same thing happens on Filevault2. In that case, Apple's only choice would be to rent some serious GPU time at NSA or something...