Computer Network Security

Suppose that this textbook was sold online (as a PDF) by your moneygrubbing author for, say, $5. Then the author would make more money off of each copy sold than he currently does10  and people who purchase the book would save a lot of money.

a. What are the security issues related to the sale of an online book?

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b. How could you make the selling of an online book more secure, from the copyright holder’s perspective?

c. How secure is your approach in part b? What are some possible attacks on your proposed system?

In the field of information security, Kerckhoffs’ Principle is like motherhood and apple pie, all rolled up into one.

a. Define Kerckhoffs’ Principle in the context of cryptography.

b. Give a real-world example where Kerckhoffs’ Principle has been violated. Did this cause any security problems?

c. Kerckhoffs’ Principle is sometimes applied more broadly than its strict cryptographic definition. Give a definition of Kerckhoffs’ Principle that applies more generally.

Suppose that we have a computer that can test 240 keys each second.

a. What is the expected time (in years) to find a key by exhaustive search if the keyspace is of size 288?

b. What is the expected time (in years) to find a key by exhaustive search if the keyspace is of size 2 112?

c. What is the expected time (in years) to find a key by exhaustive to find a key by exhaustive search if the keyspace is of size 2256?

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