pt. 1. Sensible security -- 1. All security involves trade-offs -- 2. Security trade-offs are subjective -- 3. Security trade-offs depend on power and agenda -- pt. 2. How security works -- 4. Systems and how they fail -- 5. Knowing the attackers -- 6. Attackers never change their tunes, just their instruments -- 7. Technology creates security imbalances -- 8. Security is a weakest-link problem -- 9. Brittleness makes for bad security -- 10. Security revolves around people -- 11. Detection works where prevention fails -- 12. Detection is useless without response -- 13. Identification, authentication, and authorization -- 14. All countermeasures have some value, but no countermeasure is perfect -- 15. Fighting terrorism -- pt. 3. The game of security -- 16. Negotiating for security -- 17. Security demystified.