SMC Networks Barricade SMC7004VWBR V.2 - Manual (Page 53)

Advanced Setup
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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 drop-down list or accept the
default key. Automatic 128-bit security generates a single key.