TABULA RECTA
Youu will use this in PolyAlphabetic Ciphers.In a polyalphabetic cipher, the substitution of one letter for another may change throughout the message. For example, the letter A may be encoded as the letter K for part of the message, but later on it might be encoded as the letter W.
•Vigeńere Cipher
•Beaufort Ciper
•AutoKey Cipher
•Running Key Cipher