A method of securing data stored on an electronic device 1, the method comprising encrypting the data using a cryptographic key derivable from or accessed using a passphrase, requiring the entry into the device of the passphrase when a user wishes to access the data, subsequently inhibiting access to the data whilst the device 1 remains active, and requiring the entry into the device of a predefined password when a user wishes to access the data, the password being different from the passphrase.