Codes can be obtained in several ways: * found pocket secretaries on guards or in hidden areas, * found in e-mails on . * told to you by other characters. If you have the keycode for a lock, it will be displayed on-screen and you can simply input the digits and bypass the hacking process. Unlike in Deus Ex: Human Revolution, you do not lose the XP you would get for hacking the device. By inputting the code you receive an XP bonus such as "Open Sesame" or "Entering Without Breaking" (depending on the security level). Note that you do not have to find the code in-game to be able to use it, hence this list.