Samsung PN51E6500EFXZA - Manual (Page 132)

transmit an encrypted security code
called an Access or Security Key. The
Security Key is based on a Pass Phrase,
typically a word or a series of letters
and numbers of a specified length
you were asked to enter when you set
up wireless security for your wireless
network.
If you use this method of setting up
the network connection, and have a
Security Key for your wireless network,