LetsEncrypt
https://letsencrypt.org/howitworks/
$ git clone https://github.com/letsencrypt/letsencrypt $ cd letsencrypt $ ./letsencrypt-auto --help $ ./letsencrypt-auto --apache IMPORTANT NOTES: - Congratulations! Your certificate and chain have been saved at /etc/letsencrypt/live/drew.invadelabs.com/fullchain.pem. Your cert will expire on 2016-05-15. To obtain a new version of the certificate in the future, simply run Let's Encrypt again. - If you like Let's Encrypt, please consider supporting our work by: Donating to ISRG / Let's Encrypt: https://letsencrypt.org/donate Donating to EFF: https://eff.org/donate-le