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COM SCI M282A · Lec 1

Cryptography

Fall 2026Ostrovsky, R.4 units

Also listed as MATH M209A (open, 4 of 15 enrolled, standing limit): the same class, and each department holds its own seats and its own grade history.

dibs reads this section's seats hourly, like everything else, but it does not send alerts for graduate courses yet.

Seats, time, final and grades

Seats

Open, 32 seats left.

18 of 50 enrolled.

Meets

MW 4:00pm-5:50pm

Every meeting the registrar lists for this section.

Final

Thu 10 Dec, 11:30am to 2:30pm

One exam for the whole class, Los Angeles time.

Read 2 days ago.

Grades

3.51
predicted, this instructor · 112 grades

112 letter grades, Ostrovsky, R..

Read 66 minutes ago. This is a recent reading, not a live seat count.

Enroll on the registrar (opens in a new tab)

Put this class on a board

A board is one quarter you are drafting, so it needs an account to live in. Signing in brings you straight back to this page, with this class still in front of you.

Before you can enroll

Registrar's Restrictions cell, read 2 days ago: "Graduate Students".

From the registrar

Students who enroll in upper-division courses offered by the Samueli School without completing the requisites are subject to disenrollment after the second class meeting. If necessary, consult with an OASA counselor through MyUCLA Message Center.

Restrictions read 2 days ago. dibs re-reads these slowly because they rarely change, and it does not sweep graduate courses at all, so this one has no faster cadence to move to. Check the registrar.

When it meets

Mon
Tue
Wed
Thu
Fri
6am
7am
8am
9am
10am
11am
12pm
1pm
2pm
3pm
4pm
5pm
6pm
7pm
8pm
9pm
10pm

Meets: MW 4:00pm-5:50pm

Dodd Hall 175

Grades

3.51
predicted, this instructor · 112 grades
A range
56%
P/NP
-
letter grade only
D/F/W
0.0%

Full grade history for COM SCI M282A

What students say

dibs measures outcomes: grades, seats, how fast it fills. For what the class is actually like to sit in, BruinWalk has the reviews.

Workload, very light. 5.0 of 5 for Rafail Ostrovsky, where 5 is lightest. Read 30 days ago.

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.

COM SCI M282A reviews for Rafail Ostrovsky Reviews for all professors of COM SCI M282A

Will it still be here

Not a question any more: see the notice at the top of this page.

Final enrollment per term from four years of grade data. Summer excluded: different population, different pass structure.

  • 3321F
  • 2522F
  • 2524W
  • 1624F
  • 1325F
Enrollment by term: 21F 33, 22F 25, 24W 25, 24F 16, 25F 13

Peak 33 · most recent 25F at 13

Seats over time

Freed 2 seats over about 2 months

18 of 50 · 32 left
17 Aug 15:079 Sep 04:301 Oct 17:53
dibs read 168 of the 499 hours its hourly record covers, 34%, and did not look in 331. dibs had no hourly record before 10 Sep, which is the other 584 of 1083 plotted.18 of 50 enrolled at the newest reading, 66 minutes ago, with 32 left. Seats from 17 Aug 15:07 to 1 Oct 17:53, 20 to 18. dibs read 168 of the 499 hours its hourly record here covers, 34%. An hour marked as read confirms a check, not continuous monitoring. That check recorded no change; changes between checks may be missed. For 331 hours dibs was keeping a record and did not reach this section. Nothing before 10 September at 23:00, where this section's record starts, has a read either way, which is 584 hours of this window. Where the drawing is faint or broken, that never means the readings are doubtful. It means the stretch between them is unaccounted for.

A dot is a reading where something moved: the seat count, the status, or the waitlist. Flat between dots joins recorded counts; changes between reads may be missed. The line starts when dibs first saw this section rather than reaching back before it existed. The last one is the last time dibs read this section, moved or not: 66 minutes ago.

Show the readings (50)
Recorded Enrolled Capacity Status Waitlist Hours read
1 Oct 17:53 18 50 open 0 of 15 2 of 3
1 Oct 15:02 18 50 open 0 of 15 2 of 4
1 Oct 12:02 19 50 open 0 of 15 5 of 13
1 Oct 00:22 18 50 open 0 of 15 15 of 47
29 Sep 02:02 19 50 open 0 of 15 3 of 8
28 Sep 19:42 20 50 open 0 of 15 6 of 17
28 Sep 03:22 19 50 open 0 of 15 16 of 51
26 Sep 01:12 20 50 open 0 of 15 2 of 5
25 Sep 21:42 19 50 open 0 of 15 2 of 4
25 Sep 18:32 20 50 open 0 of 15 2 of 4
25 Sep 15:02 19 50 open 0 of 15 7 of 21
24 Sep 19:22 20 50 open 0 of 15 14 of 43
23 Sep 01:32 21 50 open 0 of 15 2 of 4
22 Sep 22:02 18 50 open 0 of 15 3 of 8
22 Sep 15:42 20 50 open 0 of 15 21 of 60
20 Sep 04:12 18 50 open 0 of 15 3 of 8
19 Sep 21:22 19 50 open 0 of 15 2 of 4
19 Sep 18:02 18 50 open 0 of 15 9 of 25
18 Sep 18:42 19 50 open 0 of 15 6 of 15
18 Sep 04:32 20 50 open 0 of 15 2 of 5
18 Sep 00:22 22 50 open 0 of 15 2 of 4
17 Sep 21:42 20 50 open 0 of 15 2 of 3
17 Sep 19:22 21 50 open 0 of 15 2 of 5
17 Sep 15:52 20 50 open 0 of 15 3 of 5
17 Sep 11:12 21 50 open 0 of 15 19 of 58
15 Sep 02:42 22 50 open 0 of 15 25 of 74
12 Sep 01:02 21 50 open 0 of 15 16 of 26
11 Sep 00:40 20 50 open 0 of 15 2 of 2
10 Sep 23:40 19 50 open 0 of 15 1 of 3, 2 no hourly record
10 Sep 21:40 20 50 open 0 of 15 no hourly record
10 Sep 20:40 19 50 open 0 of 15 no hourly record
10 Sep 17:40 20 50 open 0 of 15 no hourly record
10 Sep 16:40 19 50 open 0 of 15 no hourly record
10 Sep 13:40 20 50 open 0 of 15 no hourly record
10 Sep 01:40 19 50 open 0 of 15 no hourly record
9 Sep 22:40 18 50 open 0 of 15 no hourly record
9 Sep 12:40 19 50 open 0 of 15 no hourly record
5 Sep 02:40 18 50 open 0 of 15 no hourly record
4 Sep 05:40 20 50 open 0 of 15 no hourly record
2 Sep 22:40 19 50 open 0 of 15 no hourly record
2 Sep 18:40 18 50 open 0 of 15 no hourly record
2 Sep 15:40 19 50 open 0 of 15 no hourly record
2 Sep 13:40 18 50 open 0 of 15 no hourly record
2 Sep 11:40 19 50 open 0 of 15 no hourly record
2 Sep 10:40 18 50 open 0 of 15 no hourly record
2 Sep 09:40 19 50 open 0 of 15 no hourly record
29 Aug 01:40 18 50 open 0 of 15 no hourly record
18 Aug 23:40 19 50 open 0 of 15 no hourly record
18 Aug 04:30 21 50 open 0 of 15 no hourly record
17 Aug 15:07 20 50 open 0 of 15 -
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.

Class chat

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