How to secure correctly your OpenVPN connection you said?
Yes! This little code snippet will improve drasticaly the strength of your OpenVPN connection while keeping very good performances. You just have to add the code available below at the end of you configuration file.
- It may not work everywhere. @Korben (Twitter) got a problem because his server does not support ECDHE, if you can't use this configuration then try to change ECDHE by DHE in the tls-cipher parameters. It should works but it will consume more battery if you are on a mobile/laptop because it will not use Elliptic curves to exchange the key.
- You should check if your processor have AES-NI instructions. If yes then the key exchange should be protected from SPA (Simple Power Analysis) and DPA (Differencial Power Analysis) attacks + AES will be a lot faster.