Canon imageCLASS D1650 All-in-One Monochrome Laser Printer - Manual (Page 563)

<Menu> <Management Settings> <Security Settings> <Encryption Settings> Select <On>
in <Prohibit Use of Weak Encrypt.> Select <Off> or <On> in <Prohibit Weak Encryp. Key/Cert.>
<Apply> <OK> Restart the machine
Setting Menu List
555