EC ENGR M117
Computer System Security
Lecture and lab. The registrar has published a final exam time.
Fall 2026: 1 lecture and 4 discussions. Nothing here is open. The oldest of these readings was 23 minutes ago.
Also listed as COM SCI M138 (closed by the department, limited): the same class, and each department holds its own seats and its own grade history.
Grades
3.95
Average grade awarded in EC ENGR M117. Not a student rating: this is what the grades were.
In the A range
96%
of the 266 letter grades
D, F or W
0.0%
of every letter grade awarded, plus withdrawals
Taken pass/no pass
-
the registrar has this letter grade only this term
The registrar's own records: 266 grades over 2 terms, Fall 2021 to Fall 2025. Every instructor is pooled here.
What is inside that record
No summer session is in that record.
The table below splits them, and term averages across those 2 terms ran 3.91 to 3.99.
Historical grades for TIAN, YUAN, across recorded terms. The course summary above includes all professors.
- A+ 117 · 44.0%
- A 130 · 48.9%
- A- 8 · 3.0%
- B+ 6 · 2.3%
- B 3 · 1.1%
- B- 2 · 0.8%
Percentages are of the 266 letter grades. Grey bars are non-letter outcomes.
How the non-letter outcomes are counted
They are excluded from the GPA entirely rather than scored, because counting a P as a 4.0 would be a fabrication.
By instructor
| Instructor | Predicted GPA | Raw | n | Terms | A range | Workload | Fall 2026 |
|---|---|---|---|---|---|---|---|
| TIAN, YUAN reviews ↗ | 3.95 | 3.95 | 266 | 2 | 96% | - | Closed |
Why Predicted is not the Raw average
“Predicted” is shrunk toward the course average, which is itself shrunk toward the department, so an instructor with a handful of students sits near the course mean rather than topping the list.
Grade records describe outcomes. For what a course is like to take, read student reviews written on dibs below or follow the separate external review link.
Workload and assignments
Work types reported in BruinWalk reviews of this course, across recorded instructors and terms. They may differ from this term's syllabus.
dibs has not read this course’s reviews, so it cannot say what kind of work it sets. That is dibs not having looked. It is not a course without papers or exams, and the reviews linked below are the answer until dibs catches up.
What comes first
The chain dibs can see is 3 courses long before EC ENGR M117. dibs has read a class page for every course in it.
Counted in courses rather than quarters: dibs does not know which of them a department lets you take together.
From the registrar's catalog
(Formerly numbered 117.) (Same as Computer Science M138.) Lecture, four hours; laboratory, one hour; outside study, seven hours. Requisite: Computer Science 33. Recommended requisite: Computer Science 111. Introduction to fundamental knowledge of computer system security. Students gain understanding of exploit techniques; learn to use the security tools; learn to design and implement secure systems; and learn concepts of computer security including software vulnerability analysis and defense, web security, mobile security, and network security. Covers the latest security topics in practice (e.g., cryptocurrency), and in research (e.g., state-of-the-art fuzzing techniques and machine-learning-based security analysis). Students get hands-on experience in analyzing and designing secure systems. Includes course project for cutting-edge security research. Letter grading.
Sections in Fall 2026
You enroll in the discussion, not the lecture, so a discussion's status is the one that decides whether you get in. A lecture can read open while every discussion under it is full.
Seat counts as of : the oldest of these 5 readings. Seat readings are snapshots, not live availability. Their timestamps show when dibs last checked.
-
Lec 1 MW 4:00pm-5:50pmClosed3.95predicted, this instructor · 266 grades
140 of 140 enrolled high risk
4 discussions, none open. There is no waitlist either, so the only way in is somebody dropping the lecture.
This limit is on the class, so it applies to all 4 discussions below.
Every discussion, with its time and seats (4)
Final enrollment, averaged across each term's sections: between 125 and 141 a term over 2 terms, summer excluded, most recently 125 in Fall 2025. That is the shape across years, not this term, which is above.
From the people who took it
Student reviews
What taking EC ENGR M117 was like: the work, the teaching, and what students wish they’d known.
Your experience could be the first.
No student reviews are available to read on dibs for this course yet. Took it? Tell the next person what helped, what was hard, and how you spent your time.
Looking for more perspectives?
External reviews are separate and do not count toward the dibs rating.
Seats over time in Fall 2026
How each lecture has filled since dibs first saw it.
A dot is a reading where something moved: the seat count, the status, or the waitlist.
What a flat run means, and where a line starts
Flat between dots means it did not drift, it held and then jumped, and a line starts when dibs first saw that lecture rather than reaching back before it existed. A lecture that has never moved draws a flat line across the whole window, and one with two or three readings draws a line joining them, which is too few to read a trend from.
Lec 1 · Tian, Y. · 140 of 140 enrolled
Same seat count, but the status moved and came back and the seat count moved and came back over about 1 month
How readings and alerts work
A reading and an hourly record are different things, and most charts here hold more of the second missing than present. dibs has taken readings of a section since long before it began keeping an hour-by-hour log of when it looked, so the empty stretches are dibs saying it was not keeping that log yet, not that it looked and found nothing. That is the age of the record and not a fault.
Seat counts show the last successful read, not live availability. Refreshes can be delayed by request limits or upstream interruptions. Watched sections receive priority, but an hourly update for every section is not guaranteed.
The registrar can change a seat count between our checks. Alerts depend on dibs detecting an opening and completing delivery; a quiet watch does not prove that no seat opened. Check the registrar before enrolling.