Answer Happy

(a). Please write down which of the following statements are True/False. • Kerckhoff's principle states that the cipher method must be required to be secret, and it must not be able to fall into the hands of the enemy at any cost . In perfect secrecy, the key space should be at least the message space . ) Caesar's cipher encrypts the message by shifting each alphabet to some random number of places forward C) In block ciphers, the counter mode provides more security compared to the electronic code book mode • Authenticated encryption schemes ensure data confidentiality but not data integrity (10 pts) Please explain why MAC schemes assume that a private key is shared between the parties in order to achieve message integrity. (10 pts)