Stenography, Cryptography, Encryption

For you to answer in this conference activity:  

This week I would like you to do some research of encryption and Steganography and list 5 examples each of how stego and encryption or cryptology was used before the advent of computers.  

A basic little run down between the three would be that the purpose of steganography is to hide a message within a message, encryption is to communicate a message but then “cipher” the message so that only the intended recipient could understand it, and finally Cryptography is the process or skill of communicating in or deciphering secret message or ciphers.

1. Dating back to WWII, invisible ink was used to communicate message among spies. They would write in invisible ink which could be revealed by exposure to heat or ammonia depending on the type of ink used. A typical letter would be written which to the untrained eye might seem like normal correspondence back home with standard ink, which really contained secret information to be revealed by the proper recipient. Today, prisoners use urine as their ink which can later be seen with exposure to heat to communicate secretively from within to the outside world.

2. During the same War, Nazis used Microdots to communicate drawings and information by compiling series of small little dots. These dots were so small that their message could only be read or seen when read with a magnifier. Since spies were often in enemy countries it was imperative for them to be able to communicate secretively.

3. Even Julius Ceaser used cryptography to send messages to his military leaders at war. His method was basic, but effective. Essentially he would write out a message and then shift every single letter a certain number of positions across the alphabet (he shifted 3 to the right). The key was to know how many positions each letter would be shifted so that one could read the message.

4. Let us not forget that the telegraph was used as a form of cryptography in itself. Abe...