SMC Networks SMC2804WBR V.2 - Manual (Page 61)

Advanced Setup
59
WEP Encryption Type
You can choose between standard 40-bit/64-bit
or the more robust 128-bit encryption.
You may manually enter the keys or automatically generate
encryption keys. To manually configure the keys, enter five
hexadecimal pairs for each 40/64-bit key, or enter 13 pairs
for the single 128-bit key. For automatic 64-bit security, enter
a passphrase and click Generate. Four keys will be generated
(as shown below). Choose a key from the drop-down list or accept
the default key. Automatic 128-bit security generates a single key.
Note: Active ASCII Keys must be exactly 5 characters
for 40/64-bit WEP.
Active ASCII Keys Keys must be exactly 13 characters
for 128-bit WEP.