Posts made in August, 2013

Public Key Pinning

Posted by on August 28, 2013 in Blog | 3 comments

The current browser-certification authority (CA) trust model allows a website owner to obtain its SSL certificate from any one of a number of CAs. That flexibility also means that a certificate mis-issued by a CA other than the authorized CA chosen by the website owner, would also be accepted as trustworthy by browsers. This problem was displayed most dramatically by the DigiNotar attack in 2011 and in a mistaken CA certificate issued by TURKTRUST in 2012. In these cases, certificates were issued to domains that were not approved by the domain owner. Fortunately, the problem was detected in...

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Firefox 23 Blocks Mixed Content

Posted by on August 13, 2013 in Blog | 0 comments

The latest version of the Firefox Web browser from Mozilla was released on August 6th with a great new security feature called a “mixed content blocker”. In a nutshell, this feature ensures that all of the parts of a secure Website are indeed encrypted via SSL certificates. All of the data on the website is prevented from being intercepted, and it becomes more difficult to add malware into the site’s content. Google published statistics a few years ago showing that the average number of external scripts and stylesheets on a page is roughly 10, and that number has likely increased since then....

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What Are the Different Types of SSL Certificates?

Posted by on August 7, 2013 in Blog | 1 comment

Domain Validation (DV) A Domain Validated SSL certificate is issued after proof that the owner has the right to use their domain is established. This is typically done by the CA sending an email to the domain owner (as listed in a WHOIS database). Once the owner responds, the certificate is issued. Many CAs perform additional fraud checks to minimize issuance of a certificate to a domain which may be similar to a high value domain (i.e.,, The certificate only contains the domain name. Because of the minimal checks performed, this certificate is typically...

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