Cryptography

From Simple English Wikipedia, the free encyclopedia

Cryptography is a science about making sure information can be exchanged so that only people meant to get the information can read it. It has been used for over 2000 years.

Cryptography is very important in computing and on the Internet. When someone uses the Internet, other people may be able to read the messages that the person sends. Cryptography is used to stop them.

When a message is sent using cryptography, the computer changes it before it sends it. The computer makes the message difficult to read. If someone wants to read it, they need to change it back. How to change it back is a secret, only the person who receives the message knows how to read it. Other people can not read it, so the message is normally safe.

A simple form of Cryptography is a Caesar cipher.

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