CS283 Class 1 Recap - 20090908

CS283 Class 1 Recap - 20090908 - Class 1 (20090801) Recap,...

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Class 1 (20090801) Recap, Additional Concepts, and Q&A CSCI 172/283 Fall 2009 GWU
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Class 1 (20090801) Recap Key Concepts – Confidentiality, Integrity, and Availability Definition of Availability – Threat, Vulnerability, Risk, Countermeasure Model – Residual Risk Security Policy vs Security Mechanism – Security Mechanisms: Secure, Precise, Broad Network Diagram handed out at first lecture Additional concepts: Virtual Private Network, Firewall, Proxy Server A look at a real, vulnerability published by Microsoft •Q & A Additional Reading Continue Lecture at slide 28 of Lecture 1 – Part 2 GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 01 - Rev 20090908 2
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Class 1 (20090801) Recap • Definition of System Availability Availability of a system is the percentage of time when system is operational. Availability of a hardware/software yp y module can be obtained by the formula given below. A = (MTBF/(MTBF + MTTR) where MTBF = Mean Time Before Failure (units = time) MTTR = Mean Time To Repair (http://www.eventhelix.com/RealtimeMantra/FaultHandling/reliability_availability_basics.htm} GWU CS 172/283 - Autumn 2009 Holmblad - Lecture 01 - Rev 20090908 3
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CS283 Class 1 Recap - 20090908 - Class 1 (20090801) Recap,...

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