We would like to protect biometric data used for authentication because, once compromised, it is compromised forever. Explain why one must use reversible encryption, and not a cryptographic hash, to store biometric information. (Adapted from Computer Security by Goodrich and Tamassia.) Suppose you have a computer that can make 1050 guesses per second against against a 256-bit binary combination like the lock in Part 6. About how many years will it take to try half the combinations? You may express the answer as a power of ten. Google is your friend when you need to do arithmetic like this. Just type an expression into Google and you'll get an answer. Exponentiation is represented by ^ so 1050 is 10^50.