Cryptography
From Wikipedia, a free encyclopedia written in simple English for easy reading.
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 you use the Internet, other people may be able to read the messages that you send. Cryptography is used to stop them.
When you send your message using cryptography, your 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 you sent the message to knows how to decode it. Other people can not decode it, so your message is normally safe.
A simple form of Cryptography is a Caesar cipher.