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11/26/2015 9:14 AM Midterm Grading Comments James Hook CS 591: Introduction to Computer Security.

Published byAmbrose Edwards Modified over 9 years ago

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Presentation on theme: "11/26/2015 9:14 AM Midterm Grading Comments James Hook CS 591: Introduction to Computer Security."— Presentation transcript:

1 11/26/2015 9:14 AM Midterm Grading Comments James Hook CS 591: Introduction to Computer Security

2 11/26/2015 9:14 AM Grading Guide: Q1: Availability, Integrity, Confidentiality –2 points each definition –1 point each illustration of violation –1 point for attempting problem Q2: Policy and Mechanism –3 points each definition –2 points each example

3 11/26/2015 9:14 AM Grading Guide: Q3: Chinese Wall –3 points for motivating scenario –3 points for mechanisms (COI, simple security rule, *-rule) –2 points how to model with Bell LaPadula –2 points shortcomings of using Bell LaPadula Q4: Digital signature –3 points: agreement adjudicated by trusted third party –2 points: property: non-repudiation –2 points: property compromised by bogus (non-repudiation) –3 points: justification of forgery attack

4 11/26/2015 9:14 AM Grading Guide: Q5: Access controls –2 points each AC control mode –3 points which plays with which (1 per pair) –1 point for attempting problem Q6: DG/UX confidentiality & integrity –4 points: range of levels (MAC tuples) –3 points: why confidentiality; what protected –3 points: why integrity; what protected

5 11/26/2015 9:14 AM Grading Guide: Q7: Denning Information Flow –5 points: a flow exploiting exceptions –5 points: discussion of how to control Looked for evidence of how to control within the model of Denning and Denning, e.g. assigning labels and constraints to exception handlers Q8: Nonces –5 points: Nonces prevent replay –5 points: Give a replay attack of simplified protocol

6 11/26/2015 9:14 AM Grading Guide: Q9: Block/Stream –2 points each definition (block/stream) –2 points each classification Q10: Crypto facts –2 points each Diffie-Hellman allowed either DH algorithm for key negotiation (intended answer) or general contribution of public key encryption framework [consulted text; this was stressed DH contribution]

7 11/26/2015 9:14 AM Distribution: 100 94 92 92 87 87 85 84 84 83 83 83 83 81 81 80 78 75 74 71 65 64 64 64 63 60 60 59 59 57 56 54 50 48 28 Average = 70.4 Exam will be graded on a curve.

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