As it was previously mentioned, it is not possible to stop a router from sniffing your data.

There is a simple way to make the listener's life harder by using Tor bundle (https://www.torproject.org/download/download).

Tor is a network of virtual tunnels that allows people and groups to improve their privacy and security on the Internet.

It cannot guarantee that your information will be 100% secure but if you use it properly (e.g Don't enable or install browser plugins), your data should be a bit more safe.

As it was previously mentioned, it is not possible to stop a router from sniffing your data.

There is a simple way to make the listener's life harder by using Tor bundle.

Tor is a network of virtual tunnels that allows people and groups to improve their privacy and security on the Internet.

It cannot guarantee that your information will be 100% secure but if you use it properly (e.g Don't enable or install browser plugins), your data should be a bit more safe.