II. Classical Ciphers Exercise #4 A generalization of the Caesar Cipher is the Affine Cipher given by: C-(a.P + b) mod 26, Where P is the plain character and C is the cipher character after encryption, a and b are coefficients. The decryption of the Affine Cipher is given by: P = al (C-b) mod 26, where al 1S the inverse of a mod 26. Note that characters are assigned values of A-0 and Z-25 a) Encrypt "HI" using the Affine Cipher with a 7 and b 5 b) The cipher "ME" was obtained after Affine encryption with a -7 and b -5. Decrypt it