1) Is it okay to use a hash function as a message authentication scheme? Explain.

2) Name ve people who had signicant impact on cryptography and were mentioned in the slides.

3) Decrypt the following message in order to answer the question: How do you feel today?: 0011 1111 0001 0000 0010

1000 0000 0110 0100 1001

1000 0000 0110 0000 0001

1001 0010 0110 0011 0001

0100 0000 1000 1111 1100