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By: Axa Plus  05/12/2011

SSL or Secure Sockets Layer is a security protocol created by Netscape that has become an international standard on the Internet for exchanging sensitive information between a website and the computer communicating with it, referred to as the client.

SSL technology is embedded in all popular browsers and engages automatically when the user connects to a web server that is SSL-enabled.

When your browser connects to an SSL server, it automatically asks the server for a digital Certificate of Authority (CA). This digital certificate positively authenticates the server's identity to ensure you will not be sending sensitive data to a hacker or impostor site. The browser also makes sure the domain name matches the name on the CA, and that the CA has been generated by a trusted authority and bears a valid digital signature. If all goes well you will not even be aware this handshake has taken place.

However, if there is a glitch with the CA, even if it is simply out of date, your browser will pop up a window to inform you of the exact problem it encountered, allowing you to end the session or continue at your own risk.

Once the handshake is completed, your browser will automatically encrypt all information that you send to the site, before it leaves your computer. Encrypted information is unreadable en route. Once the information arrives at the secure server, it is decrypted using a secret key. If the server sends information back to you, that information is also encrypted at the server's end before being sent. Your browser will decrypt it for you automatically upon arrival, then display it as it normally does.

Another feature of SSL technology is the ability to authenticate data so that an interceder cannot substitute another transmission for the actual transmission without being detected.