SMC Networks Barricade SMC2804WBR38 - Manual (Page 55)

Advanced Setup
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If you are transmitting sensitive data across
wireless channels, you should enable Wired
Equivalent Privacy (WEP) encryption.
Encryption requires you to use the same set
of encryption/decryption keys for the Router and all of your
wireless clients. You can choose between standard 64-bit or the
more robust 128-bit encryption.
You may automatically generate encryption keys or manually
enter the keys. For automatic 64-bit security, enter a passphrase
and click Generate. Four keys will be generated (as shown
below). Choose a key from the dropdown list or accept the
default key. Automatic 128-bit security generates a single key.