I need a security key and wep for my dsi and i

The WPA passphrase is a method of configuring the encryption code in the wireless router.
You can generate the encryption code using words and phrases so you can remember the encryption code.
You can view the encryption code in the wireless router or you can generate a new encryption code. If you generate a new encryption code then all the wireless cards in the computers on your wireless network will need to be changed so the computers can communicate/connect with the wireless router.