Using the English alphabet (i.e., mod 26 arithmetic) let plaintext corresponding ciphertext c, c2 26), what should be the decryption function. if you receive the ciphertext message YMDWNDGZQXX, decrypt to recover the plaintext. What is the decryption function, and the recovered plaintext? What type of cipher is this? What are the weaknesses of this cipher? 1. {pi, p2 , pn} and , c } . Suppose the encryption function is ci-p + 12 (mod