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Most routers will show the IP and MAC addresses of all devices connected to a network. Look in the "Status" screen or something like that. If you notice a device that is connected that doesn't belong, then bingo. As for determining who that person is, that's a different story. I suppose you could see if their computer name gives you any clues, or if they are stupid enough to be sharing files, etc. would could provide clues.
There are ways to keep your network kind of secure without WEP or WPA.
- Don't broadcast your SSID
- Assign static IP addresses to the devices on your network and then disable DHCP. That way if someone tries to connect, but has their network settings with DHCP enabled, they won't be able to.
- Reduce the transmit power on your router so that only your property is in range. This is tricky, and most of the time certain areas of a property don't have enough signal strength.
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