What are authentication and encryption?
SSL server authentication allows you to confirm a web server's identity. Your browser can automatically check that a server's certificate and public ID are valid and have been issued by a certificate authority (CA), such as VeriSign. Authentication is vital for secure e-commerce transactions in which you are sending private and confidential information over the web and first want to verify the receiving server's identity.
An encrypted SSL connection requires all information sent between a client (your computer) and a server to be encrypted by the sender and decrypted by the receiver. This protects private information from being intercepted over the Internet. In addition, all data sent over an encrypted SSL connection is protected with a mechanism for detecting tampering – that is, for automatically determining whether the data has been altered in transit. This means that you can confidently send private data, such as your account info, to us trusting that SSL keeps it private and confidential.