Domain Validation Certificates: What are the Security Implications

Let's Encrypt is a free and open certificate authority that enables those that might not be able to afford or configure HTTPS on their web servers to protect their sites.

Using tools in partnership with Let's Encrypt, such as the Electronic Frontier Foundation's Certbot, enables website administrators to freely enable TLS on their sites, and to even automate security functions within cipher suites and other encryption features.

The major goal of Let's Encrypt is to create a secure internet, with all sessions encrypted in transit. Let's Encrypt has major sponsors assisting its community -- including Mozilla, Cisco, Electronic Frontier Foundation, Google, Facebook and others -- that have offered their support for the service. Read more at the link below:

http://searchsecurity.techtarget.com/answer/Domain-validation-certificates-What-are-the-security-issues