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Another thing that might get her to pay attention is to point out all of the recent data breaches and how much harm it has caused for companies like Target. That’s something a small business definitely wants to avoid, and as the earlier reply pointed out, WEP can be easily penetrated with just a little effort. It might be marginally adequate for home use if there aren’t other people/houses nearyby, but that’s about it at this point.
WEP was the first standardized way of securing wireless networks. It encrypts your data – which is good – but doesn’t do so well enough to stop people from eavesdropping – which is bad.
Although WEP is a little better than not securing your wireless network at all, it has a weakness, and everyone knows what that weakness is. If you use WEP, anyone can crack your code in minutes and start using your WiFi – and monitoring everything you do online. This could mean kids using your wireless to download Movies illegally, or it could mean criminals stealing your identity. Either way, it’s not worth it.
I just found the following tutorial on the internet that teach you how to crack your own WEP network, so maybe showing this tutorial can convince her to improve her Wifi security :
Hope it could help.