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Self Test Appendix • Appendix 813
12. In the trust diagram shown here, which statement is true?
Figure 10.13 A Trust Diagram
Alice Bob
Dave Carol
A. Bob trusts Alice
B. Alice does not trust Dave or Carol.
C. Bob trusts Carol.
D. Dave trusts only Carol.
Answer C. Even though the arrow directly connecting them goes in the direction “Carol trusts
Bob,” there is transitive trust through Dave, meaning that Bob trusts Dave, who trusts Carol.
Bob does not trust Alice (answer A), because that would go against the arrow’s direction
between them, and there is no transitive trust.Alice trusts Dave and Carol through Bob, so
answer B is wrong. Dave trusts Carol and Bob, making answer D wrong..
13. When exchanging encrypted information with a trusted partner by e-mail, what information
do you need to exchange first?
A. Your certificates.
B. Your private keys.
C. The expected size of the data to be sent.
D. Web site addresses.
www.syngress.com
