Konica Minolta bizhub C451 - Manual (Page 339)

Function detail description 9
C451 9-42
– To do without specifying a user definition for “Encryption Pass-
phrase”, touch “Use Factory Default”.
4
Enter the encryption passphrase, and then touch [OK].
5
Enter the encryption passphrase again, and then touch [OK].
This sets the encryption passphrase.