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
•Polybius Square
