General Information


Matt Bishop
Office: 2209 Watershed Science
Phone: (530) 752-8060
Office Hours: to be arranged; or by appointment; or by chance

When you send me email, please begin the Subject field with “ECS 235B” so I see that the letter has to do with the class. I receive lots of email and, while I look at it all, I sometimes fall behind. When that happens, I skim the Subject fields to see which letters are very important. Putting “ECS 235B” at the beginning of the Subject field will tell me it is very important.


Lecture: MWF 12:10pm–1:00am in 205 Olson

Course Outline

Theoretical foundations of methods used to protect data in computer and communication systems. Access control matrix and undecidability of security; policies; Bell-LaPadula, Biba, Chinese Wall models; non-interference and non-deducibility; information flow and the confinement problem.

Course Goals


ECS 235A, Computer and Information Security or equivalent; ECS 150, Operating Systems, and ECS 120, Theory of Computation, or their equivalents, are strongly recommended


M. Bishop, Computer Security: Art and Science, 2nd Edition, Addison-Wesley Professional, Boston, MA (2018).
ISBN 978-0-321-71233-2.

Class Web Site

To access the class web site, go to Canvas ( and log in with your campus login and password. Then go to ECS 235B in your schedule. I will post announcements, assignments, handouts, and grades there, and you must submit assignments there. The alternate web site,, has all the handouts, assignments, and announcements.


There will be both homework and a project, which tentatively will each be weighted 50%. We reserve the right to change this. There will be no final examination.

Important. The grade E-NWS (sometimes called NWS or NS), which stands for “No Work Submitted”, is no longer a valid grade. In cases where it would have been assigned in the past, we will give a grade of “F”. So please be sure you drop this class rather than submit no work!

PTA Numbers

The department policy on issuing PTAs is available at If you need a PTA, please read that page, and follow the instructions there.

Important Dates

First day of instruction: January 3, 2022
10-day drop deadline: January 14, 2022
Last day to add: January 19, 2022
Last day to opt for P/NP grading: February 7, 2022
Last day of instruction: March 11, 2022

Academic Integrity

The UC Davis Code of Academic Conduct, available at, applies to this class. For this course, all submitted work must be your own. You may discuss your assignments with classmates or the instructor to get ideas or a critique of your ideas, but the ideas and words you submit must be your own. Unless explicitly stated otherwise, collaboration is considered cheating.

Remember to cite, and give the source for, anything you copy or paraphrase, as is standard academic protocol. Plagiarism is cheating and will be handled as such.

Any cheating will be reported to the Office of Student Support and Judicial Affairs.

Public Health Expectations and Best Practices

Keeping our campus healthy takes all of us. You are expected to follow university public health requirements and pursue personal protection practices to protect yourself and the others around you. These include:

Other Information

You can get more information about COVID and the campus on the Campus Ready web site. The web site Resource FAQ for Students also has useful information about the University for students .

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Matt Bishop
Office: 2209 Watershed Sciences
Phone: +1 (530) 752-8060
ECS 235A, Computer and Information Security
Version of December 28, 2021 at 4:27PM

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