6. Why do viruses spread so quickly?

a.Sarnoff's law

b.Exponential growth

c.Linear growth

7. Twitter's Twitter's servers fail for a week. 5% of all Twitter users quit forever. What is the likely impact on stock price?

a.Down 5%

b.Down 10%

c.Down 20%

8. Prior to public key cryptography, what was the major problem with sending coded messages?

a.There were only 26 letters in the english alphabet

b.Securely delivering your passwords / codebooks to the recipient(s)

c.Cost

9. What is a common codebreaking technique? a.Frequency analysis (e.g. Zipf's law)

b.Trial and error

c.Spy vs. spy

10. Bitcoin solved two challenges associated with digital money: counterfeiting and control of issuance.

a. True

b. False

11. Which researcher published work about bitcoin price manipulation that occurred in 2013?

a. Gandal

b. Griffin

c. Friedman