The science and study of cryptography related to computers has only been in existence for the past couple of decades. However, the sending of encrypted messages and the ways to read the messages actually goes back many centuries. Historians date the use of cryptic messages back to the time of Julius Caesar when he would send coded messages to his general that used a secret code to understand the communications. Over the years encrypted messages have been used during wartime as well as during peacetime.
Today in the computer field, cryptography is a huge part of computers and the Internet. Because of the popularity of online transactions it is imperative that these financial transactions be safe and secure from possible criminal involvement. The ways that cryptography is utilized is through ATM cards, the issuance of passwords for cards and online account access and through online transactions.
To help learn more about the field of cryptography and its uses, here are some information and resources on related fields: