startssl (https://www.startssl.com/ https://www.startssl.com/) also offer free SSL certificate. I usually start with EssentialSSL or PositiveSSL from comodo. I

startssl (https://www.startssl.com/ https://www.startssl.com/) also offer free SSL certificate. I usually start with EssentialSSL or PositiveSSL from comodo. If you need to secure multiple subdomain choose wildcard certificate. Domain validated have the same security with Extended validation certificate.