Cryptography

Dear Students,

The exam inspection will be tomorrow (18.08.21) from 13:00 - 15:00, please mind that due to corona restrictions you will not be allowed to attend if you did not register. You will be in one of two groups, depending on the first letter of your last name.

1. Last name starting with A - M is assigned the time slot from 13:00 - 14:00
2. Last name starting with R - Z is assigned the time slot from 14:00 - 15:00

Please be there in time for your slot. Thanks for your cooperation!

Dear Students,

we have finished the grading of the exam and you should have received an email with your results. Please mind that the grade of the exam is not the your final grade of the course, which will also take into account the grade bonus you may have earned in the quizzes.

We will soon announce a date for the exam inspection.

Dear Students,

in addition to the exam packing list (1 cheat sheet A4 front and back, non-programmable calculator, student ID and ID), please mind that you are not allowed to use any additional materials, in particular smart phones. The only exception from this are English dictionaries. You are allowed to answer the exam questions in either German or English.

The exam will start at 10:00 straight, so make sure to be at the lecture hall you were assigned to no later than 9:45. If you arrive late you will risk not being seated and missing the exam. The exam will end at 12:00, and in the last 30 minutes (i.e. after 11:30) you will not be allowed anymore to hand in your exam early and leave.

Good Luck!

Dear Students,

If you haven't yet signed up for the main exam on CMS but would like to attend, please sign up now. You have until tonight at 23:59. Tomorrow morning we will make the lecture hall seating assignments, after which it is generally not possible to seat students who are not registered (due to the strict corona regulations). Thanks for your understanding!

Dear Students,

now that the registration for the exam is closed and the exam itself just 3 days away, it is time to remind you of the corona specific regulations. Thus read the following points carefully, taken from the university's corona FAQ (https://www.uni-saarland.de/en/page/coronavirus/faq.html)

1. Medical Face Masks
   It is compulsory to wear medical face masks when moving around within buildings - except when a justified medical certificate is presented. It is thus absolutely necessary for you to bring your own protection mask with you.
2. What do you have to consider if you have flu-like symptoms?

   In light of the current infection rates in Saarland, persons who have not recently come into contact with someone with a known or suspected SARS-CoV-2 infection and who are showing only mild signs of illness (e.g. a runny nose and feeling only mildly incapacitated) may visit Saarland University sites. The same applies to people who have a known history of exhibiting similar symptoms due to a pre-existing condition, such as hay fever or a pollen allergy. Please refer to the check list for flu-like symptoms

   If, however, a person is feeling seriously unwell, particularly if they are displaying respiratory and/or flu symptoms or other symptoms relevant to COVID-19, they must stay at home and, when necessary, consult a doctor (initially by phone).

3. Do you have to get tested?
   We strongly advise you to participate in in-person meetings/events with the participants physically present on site only if you have tested negative for the coronavirus (Note: The test result may not be older than 24 hours). An exception to this is participation in face-to-face classes, including (block) seminars and exams, here only people who are tested twice a week should participate. If a person has not been tested, this may not lead to their exclusion from the in-person meeting/event. Testing is subject to Section 5a of the Ordinance on Combating the Coronavirus Pandemic (VO-CP of 7 July 2021). The test result is to be certified by the body carrying out the test.
   
   (I.e. the university cannot force you to get tested; however, if you are not vaccinated, please be mindful of your fellow men and get tested no more than 3 days before...)

Dear students,

Tomorrow there will be the full exam prep package for you! In the tutorial slot at 10:00 you will have the opportunity to discuss questions with our tutors - this might be the best spot for individual questions on some topics and exercises.
Later at 12:30 in the regular exam slot, there will be a Q&A Session with your professor - This might be the best spot for any questions that remain open and that might be interesting to a broader audience :)

I hope you are having a good exam prep time and will see you on Friday. An anouncement on exam modalities will follow tomorrow.

Best,
Stella

Dear Students,

The exam registration on the CMS is now open. You will be able to register if you achieved at least 40% of the achievable points in the quizzes (1 quiz remaining). Don't forget to also register on the LSF!

Registration will close 02.08.21, make sure to register until then. Timely registration in the CMS is especially important this year due to strict hygiene rules.

Thanks!

On Quiz 6 there was an issue with Question 3 as brought up on the Discord. We have removed the points from this exercise and your achieved points will be attributed as bonus points. We've had some issues doing this technically on moodle, so expect the points to either show up there next week or we will count it towards your total in the end of the semester.

The new exercise sheet will include an old exam question again, as you seemed to like that :) It also taps into MACs with one question. While the definitions you've learned are enough, in case of uncertainty it might help to wait for the Tuesday lecture for more examples of usage.

I wish you a sunny weekend,
Stella

Dear Students,

the number of hand-ins this week is rather low, so I'm bringing to your attention that we put a modified old exam question on the sheet, you may want to give that one a shot, if you do any task at all this week :)

Also we had to again change the grading of our quiz. The correct answer to question 5 would have been sqrt(2^n), which I put in as sqrt(n) as a typo, so we took this question out of grading as the "correct" answer is quite ambiguous. Sorry for the inconvenience.

For the definition of collissions in the exam please note, that we consider /sets/ that is if the unordered pair (w,x) is a collission i.e. H(w)=H(x), then H(x)=H(w) too, but (x,w) counts as the same collisison as (w,x) in our books. Because that wasn't super clear prior to the test, we have accepted answers that took this as two different collisions this time!

Dear students,

after the lecture a student asked for a way to get to know other students with whom to e.g. work on exercise sheets. One place is of course our very own discord server during the office hours, but the Fachschaft Information also offers a discord server where you can meet other students and exchange thoughts: https://discord.link/InofficialUdS

We have changed the exercice reflecting a question on the askbot.

If you have worked under the old version and assumed e.g. that the second die in the magicians experiment had numbers 0-9 or it has numbers 1-10 and you took it mod 10, feel free to leave your solution as it is. We mainly want to see you working with the probabilities :)