#Cryptography
Cryptography is the practice and study of techniques for secure communication in the presence of third parties and in the case of CTFs the goal is usually to crack or clone the cryptographic object to reach the flag.
###Example
If you look around the folders in this page you should be able to find a suitable way to solve this simple cipher:
Hint: Julius Caesar's favorite cipher
kxn iye lbedec
##Sources/See More Wikipedia and Cryptography