10. Software protection

Encryption

This is a method of scrambling data in such a way that only the people who have the 'secret key' to unlock the message can read it.

This is an example of ordinary text:

Humpty Dumpty sat on a wall.

Humpty Dumpty had a big fall.

This is what an encrypted code for the text would look like:

lj86ik,£lj)ay%9w2+m?lsild171724

jkd2f*hkdfh7$171kjfh7d1h4d

You obviously have to keep the "secret keys" safe from prying eyes.