Secure communication is necessary between different Internet entities.
Following are some of the examples pairs where secure communications exist among Internet entities:
1. Clients and servers requires secure information exchange.
i. User end systems and e-mail server requires secure e-mail exchange.
ii. During e-commerce transactions, user end system and web server requires secure information (such as credit card number) exchange.
iii. During online bank transactions, user end system and bank server must exchange user account information securely.
2. DNS servers have to exchange IP address of hosts securely.
3. Routers have to exchange routing information securely.
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