Secure and insecure communications

It is possible to transmit information to and from a web server secretly or not. Secret communication by a web server is usually done via TCP port 443. For example email messages at Gmail are read via port 443. If anyone intercepts such a communication it will be just a garbage, you can securely type your username and a password to a website that establishes secure communication.

Secure communication comes at a cost of increased processing resources. Encryption of a server communication requires additional processing resources.

At the client side we don’t notice an increased CPU utilization. This is because we typically send and read one message at a time. However servers need to make these messages available to a lot of users. Servers handle a lot of messages and traffic. Encryption of it requires significant processing resources.

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