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Lecture 21 Overview

Lecture 21 Overview. What is a Trusted System?. Functional correctness Enforcement of integrity Limited privilege Appropriate confidence level. Security Policy. A security policy is a statement of the security we expect the system to enforce

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Lecture 4 Overview

Lecture 4 Overview. Data Encryption Standard. Combination of substitution and transposition Repeated for 16 cycles Provides confusion and diffusion Product cipher Two weak but complementary ciphers can be made more secure by being applied together. Types of Permutations.

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Lecture 9 Overview

Lecture 9 Overview. RSA. Invented by Cocks (GCHQ), independently, by Rivest, Shamir and Adleman (MIT) Two keys e and d used for Encryption and Decryption The keys are interchangeable M = D( d , E( e , M) ) = D( e , E( d , M) ) Public key encryption

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Cs 450 650 - PowerPoint PPT Presentation

Lecture 21 Overview

Lecture 4 Overview

Lecture 9 Overview