While the Internet is designed to be efficient and robust, it is an unsecured communication system. Cryptography is used to protect information. It is used to control access to computer systems and to sign digital messages. It is also used to exchange digital money and facilitate online voting. The role of cryptography is mentioned below:

1. Authentication

2. Authorization

3. Confidentiality

4. Integrity

5. Nonrepudiation

Cheap server hosting company is using cryptography technique to secure their web information.