Let's say I encrypt a message using a monoalphabetic substitution cipher with a keyphrase, using the keyphrase "the patriots lost". The letter y in the plaintext will be encoded with what letter in the ciphertext? (Note: We assume that, after the keyphrase is used, the cipher-alphabet begins with the first available letter after the last letter used in the keyphrase.) Let's say that I defined a substitution cipher that contains the following mappings (among others for the rest of the alphabet, not listed here): Plaintext Symbol Ciphertext Symbol Which of the following types of ciphers could my encryption system not be an example of? Caesar shift cipher Simple monoalphabetic substitution cipher Monoalphabetic substitution cipher with a key phrase Nomenclator Huh? It could be any of these