Symmetrically encrypt a master passphrase key

A method, comprising:

• generating an encryption key based on authentication information;
• symmetrically encrypting a master passphrase key using the encryption key;
• storing the encrypted master passphrase key;
• symmetrically encrypting a first passphrase key associated with a first machine-readable storage medium using the master passphrase key;
• symmetrically encrypting a second passphrase key associated with a second machine-readable storage medium using the master passphrase key;
• and
• storing the encrypted first passphrase key and the encrypted second passphrase key.

A method, comprising:

• decrypting a stored symmetrically encrypted master passphrase key using a decryption key derived from authentication information;
• using the decrypted master passphrase key to decrypt a set of symmetrically encrypted machine-readable storage medium passphrase keys;
• storing the decrypted passphrase keys in volatile memory;
• and
• using at least one of the stored passphrase keys to access an associated machine-readable storage medium.