Why is the OTP scheme information-theoretically secure? What is another name for "secret key cryptography"? What does strong authentication refer to? Briefly describe an example of the use of strong authentication. What is a checksum? What does a cryptographic checksum do? What does MAC mean? How is it useful? What are the names of the keys used in public key cryptography? How is a public key signature different from a secret key MAC? Which algorithms are generally faster, public key or secret key algorithms? How could public key cryptography algorithms and secret key algorithms be combined? Briefly describe an example of how Alice can use public key cryptography to verify Bob's identity. What is another term for hash algorithms? Is the output of a hash algorithm fixed or variable in length? In general, is it computationally feasible and easy to find a message that produces a particular hash? Explain. Why is it convenient for a server to store hashed passwords instead of the actual passwords? What is a keyed hashed? What can it be used for? What does message fingerprinting entail? Briefly describe what a ciphertext only attack is. Briefly describe what a known plaintext attack is. Briefly describe what a chosen plaintext attack is. Briefly describe what a chosen ciphertext attack is. Do you want a random value used in an encryption scheme to have high entropy or low entropy. Briefly explain why.