1. Alice wants to send an encoded message to Bob. She uses a passphrase (key). How does Alice share her key with Bob?

a. Asymmetric encryption

b. Proof of work

c. Hashing

2. What is the purpose of mining on a bitcoin blockchain?

a. It validates and adds blocks of transactions to the ledger. Miners get fees and a reward

for this work.

b. It's a guaranteed way to make money.

c. Public key cryptography ensures the hashrate is cheapest.

3. In the bitcoin blockchain, mining proof of work is done by

a. Alice and Bob

b. RSA algorithm

c. "guess and check" e.g. trial and error to find the special number "nonce" that solves a

problem

4. Benford's law and Zipf's laws are examples of

a. Random distribution

b. Normal distribution

c. Pareto distribution

5. Which law has been used to detect financial fraud?

a. Zipf's law

b. Metcalfe's Law

c. Benford's law