HTTPS protocol transmits information in an encrypted format between a client Browser and a receiving Server. When a web page is HTTPS it means that Secure Socket Layer (SSL) has been enabled. SSL, a protocol developed by Netscape Communications is generally invoked for web pages that involves buying goods or services online or for entering other personal information such as credit card or  social security information. Information is transmitted in an encrypted form between the client browser and the end Server and vice versa. Without SSL being enabled, information or data is transmitted without encryption and is insecure. Anyone can intercept the data and misuse it. 

 How to know that the page is secure? The webpage begins with https instead of http. Look for some visible indicators as well.

• A padlock appears on the status bar. In newer versions of IE and Firefox, the padlock appears on the address bar
• For an Opera Browser, the padlock will be visible right on top at the address bar.
• In Netscape, a padlock icon appears on top at the address bar as well as on the status bar at the bottom.
• Place the cursor on the padlock or double-click on the padlock icon to view the encrytion strength and other details. The encryption should be 128 bit strength or higher.
• The user can also verify the security certificate that verifies the website's identity, expiration date etc.

External References

• Thawte  the global certificate authority
• Verisign  SSL Encryption.

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