810:088 class #14 - week #3 (Thursday)

  1. What is a digital signature? What issues in the CIA triad does it address? Explain how it addresses each.

  2. PGP and message digests: PGP uses a hash function and produces a short message digest.

  3. More PGP links.

  4. What are the five steps for Alice preparing a secure email message to be sent to Bob, using the PGP system?

  5. Comparing encryption methods:
    1. Which is the faster encryption method? Symmetric or Asymmetric?
    2. Which one requires much larger key size to achieve the same level of privacy and confidentiality protection for the information.
    3. How does the PGP system design address these differences in conventional and public key encryption by combining both approaches?