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If you must use WEP security, try to choose a key length of 128 bits. If your router or wireless computer do not support 128 bit keys, you can try 64 or 40-bit keys, but note that these are even less secure.
Supply a passphrase for your WEP encryption. Later you'll need to use this same passphrase when configuring WEP on your wireless computer connection. Typically you can leave the remaining WEP options unchanged.
Choose WPA2 encryption if supported by your wireless computers. Our particular router offers a mixed WPA mode, which will connect to WPA2 where available or else try WPA. Your router may or may not offer this feature, in which case you may need to select WPA mode if your network users may use hardware, which does not support WPA2.
Your "Pre-Shared Key" is your WPA password. It must be longer than 8 characters up to 63. A longer, more difficult to guess key provides stronger security, but you must write it down somewhere safe because all connecting computers must use this password key.