Is there a way to encrypt traffic to avoid MITM attacks?
I use Google Chrome. Thank you in advance.
Many! Almost every good method for this involves a public/private keypair. To ensure that you are corrected to the correct endpoint, you must know trust the other side's key. If you don't somehow verify the key on the other end of the connection, the value is very limited as an attack can substitute themselves during the connection setup.
As long as your endpoint is verified, you can make a safe connection from open WiFi at DEFCON and have a safe connection (so far as we know, but the researchers do like to play there). SSL, SSH, IPSEC... they all follow these rules.
Since you mentioned a secure connection to your router, there are two things to look at. The first is that if you're trying to protect against people who aren't authorized to connect to your network and you're wireless, WPA2 with a strong passphrase will keep you from associating with the wrong access point or them associating with your access point... as long as you have WiFi protected setup turned off, anyway.
The second thing is back to the "uniform" setup that should work even with mischief on your own network: a VPN. Enable an appropriate VPN (IPSEC or other; there are a few) on your router and connect to that when you come online.
If you use SSL and only work with sites that use SSL certificates that are trusted by your browser (pass validation by your browsers trusted certificate authorities) your traffic should be safe from main-in-the-middle attacks.
By validating the SSL certificate as signed by the trusted CA you know that the session encryption key is valid and only known by you and the site you are communicating with.
Host authentication provides this same protection when using SSH.