Discussion Questions: Bishop, Chapter 11 Cipher Techniques

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Discussion Questions Bishop, Chapter 11 (Cipher
Techniques)

• What is meant by the "entropy of the message" in
  11.1.1
• Is RSA a block cipher or a stream cipher?
• We have seen several cases where multiple passes
  through the encryption algorithm provably makes
  the cipher harder to crack.  Give two examples of
  this from class.  Is this always the case?  If
  not, give a counterexample or two.
• What are the advantages and disadvantages of
  putting your security mechanism in the network
  transport layer as opposed to in the IP layer as
  opposed to in the application layer?