(a) Is the function E(m)=13m+11(mod26) a good candidate for an affine cipher? Justify you answer. it is not y=13x+11(mod26) ? 4 (b) The ciphertext (21,10,5,14) was encrypted using an affine cipher modulo 26. The first symbols of the plaintext are 2 and 11 . Find the encryption function. (c) For the problem in (b), find the decription function (you may use the fact that 19111(mod26)). ineryption function: 911x+211=y (e) Which of these statements are true (put T or F by each item as appropriate): - Hill cipher is a block cipher - Hill cipher is a public key cipher TF - Hill cipher is a symmerric key cipher T