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This message only means that you’re likely using either Wired Equivalent Privacy (WEP) or Temporal Key Integrity Protocol (TKIP) encryption.
There are different levels of encryption you can choose for your network, and picking one is as easy as picking another. You'll likely see WEP, WPA 2 and WPA1 as your choices. WPA2 is the most secure, so you should choose it.
This type of protocol can be changed depending on the type of make & model of the router you're currently using.
You may refer to these articles on how to change the Wi-fi settings on your modem/router:
Feel free to let us know should you still require further assistance.