(2). Transposition ciphers Write letters of message out in rows over a specified number of columns. Then reorder the columns according to some key before reading off the rows Key: 5 1 6 3 4 7 2 Ciphertext: ETNDCDCESNTHNSMUHAREIIERRNOSASTAEETYUVSTOU Please use this method to decrypt the above cipher text Plaintext: 1 2 3 4 5 6 7 Write down the plaintext as: z (3). If we could let a b c d e f g h i j k 1 m n o p q r s t u V W 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 Public key = {e, n) = {3, 33) and Private key = {d, n} = {7,33). (a) Please decrypt the ciphertext (30,4,28,19,26,3,18,19,19,4) (b) Please encrypt the plaintext message "Summer" by use RSA algorithm