Understanding technical terms used in SSL is essential. Here you can learn more about:

• The "green bar" display
  
• The additional licence
• The certificate free reissue
  
• The browsers recognition
  
• The additionnal SAN
  

"Green bar" display with EV certificates (Extended Validation)

An EV SSL certificate installed on a machine displays a green bar in the address bar of the browser.

That green bar is a visual garantee that the transactions are secured on a website.

Green bar display on the most popular browsers:



In 2007, several surveys showed that the green bar display generated instant positive reactions for 75% of internet users,a 15% raise of the purchase intentions and a 15% decrease in the abandonment of the purchase process.

The EV SSL certificate is therefore a powerfull marketing tool that can boost your Ecommerce websites.



The additional license

Depending on your needs or your technical pool,you may need to install your certificate on several machines.

Some certificates are sold to be installed on a unique machine (physical or virtual).The additionnal licence makes then possible to duplicate an existing certificate instead of buying a new one for each different machine you may use.

• Physical machine:Electricaly connected machine
• Virtual machine:In process machine

Several configuration can be encountered :

• Active / Active
• Active / Inactive
• Back-up site
• Several virtual machines on one physical machine

Comodo's certificates evolve and are now sold with unlimited machines licenses.
So,install your certificates on as much machines as you need for the price of one product !



A digital certificate reissue:

A new certificate can be reissued in substitution of an existing one with the same fields but a different pair of keys*.

That can be done in those situations:

• A certificate loss after a hard disk failure
• A software switching
• The modification of the key sizes
• The vulnerability of the privet key
• The upgrating of the signature from MD5 to SHA1

*pair of keys : Item privet key / public key elements : if a new pair of keys is needed a new CSR has to be requested.

Browsers recognition

The SSL certificate is issued partly to garantee the integrity and the security of the online transactions no matter the browser used.

That's why, Comodo has installed its certificates root on the most popular browsers:

That work enables Comodo's certificates to be massively recognized by the browsers (more than 97%).

TO SUM UP:When opening a secured session (connexion to a HTTPS page) the browser checks the validity of the certificate and makes sure  that it has been issued by a trusted certification authority.

The SSL certificate is trusted if it is signed by a "trusted" or pre-installed root certificate.


The additionnal SAN

A multiple site certificate is issued to secure several domains (or SANs) hosted on a same server:

• 5 SANs with the Comodo UCC
• 3 SANs with the Comodo Multi Sites EV

It is then possible to secure other domains by purchasing additionnal SANs instead of buying a new certificate for each extra domain.