Advanced Encryption Standard was adapted by the US as it's standard encryption and is essentially unbreakable within a period of time that is considered to be reasonable before the next standard is developed.
It is available on newer cheap routers but not all ethernet cards have it. You can use WPA pre-shared key and set a good password and you will be OK!
zeroth
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http://en.wikipedia.org/wiki/Temporal_Key_Integrity_Protocol
you may also find that useful
802.11 encryption can be enabled for wired or wireless networks in fact
For a wireless network, definately use encryption but for a wired network, unless it has an insecure path (e.g intruders are able to easialy physically connect) or you are doing something really confidential, then its not needed.
jbennet
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