Samsung UE40ES7000U E-Manual page 185

Most wireless networks have an
optional security system that requires
devices that access the network to
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
security for your wireless network.
If you use this method of setting up