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Secure Operating Systems

Secure Operating Systems. Lesson 10h: Open versus Closed Source. Where are we?. Time for a debate: open versus closed source systems We’ve pretty much done with a lot of the core topics, yay!. Open Source. For the sake of discussion, what do we mean by “open source”?.

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Secure Operating Systems

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  1. Secure Operating Systems Lesson 10h: Open versus Closed Source

  2. Where are we? • Time for a debate: open versus closed source systems • We’ve pretty much done with a lot of the core topics, yay!

  3. Open Source • For the sake of discussion, what do we mean by “open source”?

  4. Arguments for Open Source? • “Many eyeballs” • Makes security through obscurity “impossible” • Opens up code reuse… (is this a pro or a con?) • Allows someone to patch their own system once a vuln is announced (can also be a con)

  5. Arguments for Closed Source? • Patch management is simplified – harder to reverse engineer exploit • Cost to the attacker (possibly false sense of security though) • More control – paid employees • Centralized

  6. Data: Days of Risk? • What meaningful things can we measure about OS security? Well, one is days of risk

  7. Data: A Tale of Four Kernels

  8. We found a vuln, oh noes! • Open Source: • Closed Source:

  9. Modular v. Monolithic? • Open Source: • Closed Source:

  10. To Do • Read “A Tale of Four Kernels”

  11. Questions & Comments • What do you want to know?

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