1 / 9

QMCS 490 - Class Today

QMCS 490 - Class Today. Handing back the exam Projects Certificates and Chaining SSL and “Spot the Plaintext”. Exam. 76 points total Median: 88% (-9 points); Lowest: 82% Let’s work through the problems Problem 2 first – it’s easy Just about everyone got it

tannar
Download Presentation

QMCS 490 - Class Today

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. QMCS 490 - Class Today • Handing back the exam • Projects • Certificates and Chaining • SSL and “Spot the Plaintext” R. Smith - University of St Thomas - Minnesota

  2. Exam • 76 points total • Median: 88% (-9 points); Lowest: 82% • Let’s work through the problems • Problem 2 first – it’s easy • Just about everyone got it • I wanted to see physical security in sensible places • I wanted to see access control policies/procedures • Locks, access cards, whatever • Specify who gets in and who is excluded R. Smith - University of St Thomas - Minnesota

  3. Problem 1 • Tradeoff study • You don’t list shared features! • I.e. choose between jeep and Hummer • 4WD • Gasoline powered • Internal combustion engine • Seats for driver and passengers • Which is most common today for linking sites? • If I didn’t come away convinced, you got 4 points off. • If you listed shared features, 2 points off • IDEALLY: 2 “real” reasons for/against each • Less than that, or wrong direction, and I took 4 points R. Smith - University of St Thomas - Minnesota

  4. Problem 1 rough “answer” • Link encryption • Established technology (so says the book) • Potential crypto protocol weaknesses (replay, etc.) • Expensive to deploy – renting dedicated links (so says the book) • Expensive to add new links – new hardware EVERYWHERE • IPSEC crypto • More complex technology (so says the book) • Broader protections (anti replay, anti tamper) • Cheaper to deploy – just need an Internet connection • Cheaper to expand – just add the new site’s hardware R. Smith - University of St Thomas - Minnesota

  5. Problems 3 and 4 • What are the 3 types/classes of firewall? • Problem 3: how can the different classes be used by a government to suppress information? • Points for identifying ‘real’ mechanisms • Points for linking it to information worth suppressing • Political items and commentary • Culturally inappropriate material (porn) • Problem 4: how can dissidents or other troublemakers circumvent these 3 firewalls? • At least 1 practical example for each for getting access • Not interested in plain old troublemaking R. Smith - University of St Thomas - Minnesota

  6. Project Schedule • Team and project THIS WEEK • Tell me next Tuesday • What you’re doing; who you’re working with • Three page Outline by December 4 • Major ‘facts and elements’ of the topic • List of information sources you will use • Final Project Due last week of class R. Smith - University of St Thomas - Minnesota

  7. Continuing with Certificates • Can someone tell me how a certificate works? • How does Firefox/Explorer, etc, validate a server certificate? • Crypto credentials • URL • How does ‘certificate chaining’ work? • Commercial certification authorities • Web of trust and confidence in keys R. Smith - University of St Thomas - Minnesota

  8. How SSL Works • How do we use RSA to share secret keys? • Where is the plaintext? • What if we use RC-4 for encryption? • Generating distinctive keys from limited entropy R. Smith - University of St Thomas - Minnesota

  9. That’s it • Questions? Creative Commons License This work is licensed under the Creative Commons Attribution-Share Alike 3.0 United States License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/3.0/us/ or send a letter to Creative Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA. R. Smith - University of St Thomas - Minnesota

More Related