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University of Palestine

University of Palestine. Information Security Principles ITGD 2202 Ms. Eman Alajrami 2 nd Semester 2008-2009. Course Textbook s. [1] Matt Bishop, “Introduction to computer security”,2004.

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University of Palestine

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  1. University of Palestine Information Security Principles ITGD 2202 Ms. Eman Alajrami 2nd Semester 2008-2009

  2. Course Textbooks • [1] Matt Bishop, “Introduction to computer security”,2004. • [2] William Stallings, “Cryptography and Network Security Principles and Practices, Fourth Edition” , 2005 • Lecture slides by Eman Alajrami

  3. Chapter 1 – Part1

  4. Introduction • Information Security requirements have changed in recent times • traditionally provided by physical and administrative mechanisms • computer use requires automated tools to protect files and other stored information • use of networks and communications links requires measures to protect data during transmission

  5. Definitions • Computer Security - generic name for the collection of tools designed to protect data and to thwart hackers • Network Security - measures to protect data during their transmission • Internet Security - measures to protect data during their transmission over a collection of interconnected networks

  6. Basic Components of Security • Confidentiality • Keeping data and resources hidden • Integrity • Data integrity (integrity) • Origin integrity (authentication) • Availability • Enabling access to data and resources Confidentiality Integrity Availability

  7. Classes of Threats • Disclosure • Snoopingالتطفل • Deception الخداع • Modification, spoofing, repudiation of origin, denial of receipt • Disruption تشويش • Modification • Usurpation • Modification, spoofing, delay, denial of service

  8. Policies and Mechanisms • Policy says what is, and is not, allowed • This defines “security” for the site/system/etc. • Mechanisms enforce policies • Composition of policies • If policies conflict, discrepancies may create security vulnerabilities

  9. Goals of Security • Prevention • Prevent attackers from violating security policy • Detection • Detect attackers’ violation of security policy • Recovery • Stop attack, assess and repair damage • Continue to function correctly even if attack succeeds

  10. Trust and Assumptions • Underlie all aspects of security • Policies • Unambiguously partition system states • Correctly capture security requirements • Mechanisms • Assumed to enforce policy • Support mechanisms work correctly

  11. Assurance • Specification • Requirements analysis • Statement of desired functionality • Design • How system will meet specification • Implementation • Programs/systems that carry out design

  12. Operational Issues • Cost-Benefit Analysis • Is it cheaper to prevent or recover? • Risk Analysis • Should we protect something? • How much should we protect this thing? • Laws and Customs • Are desired security measures illegal? • Will people do them?

  13. Human Issues • Organizational Problems • Power and responsibility • Financial benefits • People problems • Outsiders and insiders • Social engineering

  14. Tying Together Threats Policy Specification Design Implementation Operation

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