What is Double VPN and How to Encrypt VPN Twice? A Double VPN adds a second VPN server in the mix, as well as a second layer of encryption. Actually, encrypted data is encrypted a second time on the end-user device. If your objective is to increase your anonymity on the internet, however, a double VPN may be worth it. Routing your data through two VPN servers drastically decreases the likelihood of anyone connecting it back to you.