A Book of Codes

By Oscar

A guide to 4 awesome

types of code!

Chapter 1

Cryptography

Cryptography, or the study of codes, has been around for hundreds of years, starting in the time of Julius Caesar. In this book you will learn 4 basic codes, the Caesar Cipher, Mirror Code, The Front Letter At The Back Code, and Number Instead Of Letter Code. However, these codes are easy to intercept, so don’t use any for super-secret messages. You have been warned.

NOW LET’S GET CODING!

Chapter 2

The Caesar Cipher

The Caesar Cipher was used by Julius Caesar to keep his private correspondences private. To use this code, you replace each letter with a letter 13 letters down from the original letter. Here are the Caesar Cipher letters: A=N B=M C=O D=P E=Q F=R G=S H=T I=U J=V K=W L=X M=Y N=Z

And the other way around.

         Try this code: DFCHQOH HTQ QZJUCFYQZH

ANSWER:ʇuǝɯoɹᴉʌuǝ ǝɥʇ ʇɔǝʇoɹd

Now you know the Caesar Cipher. Onward!

                       

 Chapter 3

     The “Number Instead

         Of Letter Code”

This code works by replacing a letter with a number.

A=1 B=2 C=3 D=4 E=5 F=6 G=7 H=8 I=9 J=10 K=11 L=12 M=13 N=14 O=15 P=16 Q=17 R=18 S=19 T=20 U=21 V=22 W=23 X=24 Y=25 Z=26

Try to read this:79181519 1185 119 715154 119 2152519.

Answer: