If a MAC tag is K-bits long, how much work is needed to find a collision to that specific value.
(a) $$ 2^{k/2} $$
(b) $$ K^2$$
(c) K!
(d) $$ K^K$$

The out put length of SHA – I is _____________ bits
(a) 128
(b) 16
(c) 64
(d) 256

Best way to achieve both privacy and message integrity
(a) Encrypt and Authenticate
(b) Authenticate then Encrypt
(c) Encrypt then Authenticate
(d) All