2 points QUESTION 16 1. Restoring the plaintext from the ciphertext is A deciphering B. transposition C. steganography D.encryption 2 points QUESTION 17 1. techniques map plaintext elements (characters, bits) into ciphertext elements. A. Transposition B. Symmetric C. Traditional D. Substitution 2 points QUESTION 18 1. All other things being equal, smaller block sizes mean greater security. True False 2 points QUESTION 19 1. Monoalphabetic ciphers are easy to break because they reflect the frequency data of the original alphabet. True False 2 points QUESTION 20 1 The greater the number of rounds, the A. easier it is to perform cryptanalysis. B. less difficult C.equally difficult D. harder