CIS 4930/6930: Systems Security Instructor: Xinming “Simon” Ou TA: Xiaolong “Daniel” Wang Class time: MW 2-3:15 1

Logistics Course website: ??? where you can find –Lecture slides –Programming assignments and homework –Reading materials 2

Logistics - continued Communications –A facebook group will be created and you will be invited to join. Feel free to post your questions/comments/ideas attendant to the course. –Course announcements will be made through s. Questions to instructor and TA must be sent through s to guarantee a response. 3

What is this course about? Provide a comprehensive treatment of computer system security –Attackers do not play by any rules –How protection mechanisms in OS can help mitigate attacks –Different types of OS protections –Utilizing special hardware for security Cover both defense and offense aspects Cover both theory and practice 4

Topics Common attack techniques OS protection mechanisms Mandatory access control Capability systems Trusted computing Device security Cloud security 5

Tasks Lectures Readings Assignments (about one per week) –Homework –Programming projects Exams –Midterm and Final 6

Grades 7 Homework and projects: 50% Exams: 40% Class participation: 10% CIS4930 and CIS6930 graded separately

Collaboration Policy Exams: no collaboration Homework and programming assignments: discussion with other students OK, but must indicate who you discussed with in your submission 8

Class Participation (CIS 6930) Everyone must present one reading assignment (5 pts). –Order will be sent through –One week to finish reading and prepare for a 20-min presentation in class Students not presenting participate in the discussion (e.g., asking questions) (5 pts). –We will also ask you questions during the presentation 9

Class Participation (CIS 4930) Participate in the class discussion (e.g., asking questions during lectures and paper presentations) (10 pts). –We will also ask you questions 10

What is Security? Classical definition: –Confidentiality –Integrity –Availability Security is the prevention of threats from causing undesired effects –Threat model is important: who are your adversaries? What is at stake? 11

Can we have absolute security? Security is always a trade off between cost and risks Threat model: –Who are the adversaries? –What are their motivations? –How capable are they? –How much risk can they afford? Effectiveness of countermeasures: –How much risk is reduced for users? –How much inconvenience is incurred on users? –How much risk is increased for adversaries? 12

Example1: Spam s Which one of C,I,A does this problem fall into? What is the threat model? What are possible counter measures? 13

Example 2 14

It is a Human Problem Security is as much a social, organizational, and economic problem as it is a technical problem –Incentives for good behaviors vs. bad behaviors –Technologies contribute to/help address the problem 15

What do you mean by “System Security” “System” is a platform on which various applications function. –In most cases you can think of it as OS A system provides various protection mechanisms for the applications within it. –Protection is closely related to security, although not the same. 16