Lecture3.2 - 2150 / TEL 2810 IS 2150 / TEL 2810...

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Unformatted text preview: 2150 / TEL 2810 IS 2150 / TEL 2810 Introduction to Security James Joshi ssociate Professor SIS Associate Professor, SIS Lecture 3.2 September 13, 2011 ccess Control Model Access Control Model Foundational Results 1 Protection System State of a system Current values of emory locations registers secondary storage etc memory locations, registers, secondary storage, etc. other system components Protection state (P) system state that is considered secure A system state that is considered secure A protection system Captures the conditions for s tate transition Consists of two parts: A set of generic rights A set of commands 2 Protection System Subject (S: set of all subjects) Eg.: users, processes, agents, etc. Object (O: set of all objects) Eg.:Processes, files, devices Right (R: set of all rights) An action/operation that a subject is llowed/disallowed on objects allowed/disallowed on objects Access Matrix A: a[s, o] R Set of Protection States: (S, O, A) 3 Initial state X = (S , O , A ) State Transitions i +1 X i X i +1 X i i +1 X i +1 : upon transition i +1 , the system moves from state X i to X i +1 * the system moves from * X Y : the system moves from state X to Y after a set of transitions...
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This note was uploaded on 02/07/2012 for the course SIS 2150 taught by Professor Joshi during the Fall '11 term at Pittsburgh.

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Lecture3.2 - 2150 / TEL 2810 IS 2150 / TEL 2810...

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