What is SSL and Why Do I Need It?

18th January, 2011 by

SSL is a vital tool in securing your information when communicating sensitive data online, and can help protect you and your clients/visitors. Unfortunately many site-owners and users don’t understand what SSL is, how it works or how it can benefit them. This post aims to be a simple clear-cut guide on what it is, how it works and why you and your visitors need it.

What is SSL:

SSL (Secured Socket Layer) or HTTPS:// as it is more commonly known is a secure connection between you and the website (server). SSL adds an additional layer of security to the connection, which encrypts all data to and from the server and your browser. The key aims of SSL are to protect data in transit from being snooped (intercepted and “read” by others).To help to ensure integrity of the data (ensure no body modifies the data in transit) and authentication (checking that the person who says they sent it, really did).

SSL should always be used to secure connections when handling sensitive data such as credit card details or online banking.

How it works:

SSL was originally developed by Netscape for sending files and data via the web without the risk of nosy neighbours peeking (sniffing) the data being sent/received. SSL uses a cryptographic key system which uses two keys used to encrypt the data being sent. The first key is the “public” key which is available to anyone. The second key is the “private” key which is only known by the intended recipient of the data.

For example: If a site wishes to establish a secure connection to a user, it can provide the public key to them which the user uses to encrypt the data being sent, the site then uses its private key to decrypt the data back into the original plaintext which can be understood and processed.

What is a Certification Authority (CA)?

The Certification Authority (CA) acts as a trusted third-party. It is usually a well-known company such as GlobalSign, Verisign or Thawte. They will issue the SSL Certificate and are used to verify the owner of the public key. The benefit to using SSL Certificates issued by a trusted CA instead of using “self-signed” certificates, or a certificate from a small unknown company is that most browsers trust the authority by default. This means that it will display the padlock symbols and “green-bars” to show the certificate is valid. However if you use an untrustworthy certification authority it is likely that your users browsers will display warning errors and likely warn them not to proceed to the site.

SSL provides an easy and effective way to secure connections between users and websites and is a must if you require users to submit any sensitive data. Not only does a SSL certificate add security to the connection it also boosts consumer confidence when using e-commerce systems or providing other sensitive information.
It is cheap and easy to secure your site with a certificate.

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Guest Blogger: Dan Rodgers from Dansgalaxy.co.uk / Avid  web-developer, lover of technology, web hosting & server geek.

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