A monoalphabetic cipher is a substitution cipher that uses the same substitution across the entire message. For example, if you know that the letter A is enciphered as the letter K, this will hold true for the entire message. These types of messages can be cracked by using Frequency Analysis, educated guesses or trial and error.
~Caesar Cipher
~Atbash Cipher
~Keyword Cipher
~Pigpen/Masonic Cipher
~Polyblus Square
