Since this course is an introduction to encryption, we should cover what it is. Cryptography means
“hidden writing”, and various forms of hidden writing have been used throughout history. One of
the main goals of cryptography is to communicate with another party in such a way that if anyone
else is listening, they cannot understand what you are saying. So, in its most basic form
cryptography garbles text in such a way that anyone that intercepts the message cannot understand it.