Then maybe behind some 'More information' button: If you have lost the encryption key or if you want to discard all user data and reset encryption, press choose Reset home folder and loose data -option from pulley menu. Please power off, check that SIM card is in place and is the same as used when encryption was activated, or is one that has had the encryption key exported to.' If the SIM card is missing or if the key cannot be found from the SIM card, or key is found but it does not work, the UI should simply say that 'Unable to retrieve user data encryption key from SIM card.

The SIM card PIN code could be kept in memory and reused for lock screen PIN. This way double/triple PINs and lock screens could be avoided. Then all the user ever needs to know and enter is the phone SIM card PIN, which they anyway need to remember. The phone OS parts should stay unencrypted (they shouldn't anyway contain any sensitive user data) and the phone should be able to boot up and until the SIM card needs to be opened without asking the user for any encryption keys. The PIN/PUK-code system protects from brute force attacks. The SIM card is designed to be hard to crack both by software and physically. Retrieve encryption key from SIM card memory and mount the user's home folder.Ask user for SIM card pin, then open SIM card.Automatically boot up and until SIM card is ready.The boot and mount process should be like this: Related to requests like I would suggest to save the encryption keys inside the SIM card.

Crack puk code sim card