Cryptography (WS 2021/22)
Understand the building blocks of modern cryptographic protocols and learn the basics of cryptanalysis
Table of Content
Cryptography is the mathematical backbone of information security.
This lecture covers basic principles of cryptology and a closer look at the building blocks that provide confidentiality, authenticity, and more in modern cryptographic protocols, including:
- Authenticated Encryption, hashing, and symmetric primitives (AES-GCM, SHA-3, …)
- Asymmetric encryption and digital signatures (RSA, DH, DSA, ECC, …)
- Authentication and key-exchange protocols, including an introduction to advanced privacy-preserving protocols
For all these building blocks, we will have a look at the design ideas and goals behind the algorithm, its security properties in practice, and some potential cryptanalysis approaches such as differential cryptanalysis. We will cover the necessary mathematical and methodical background so that you can try your own hands in the exercises at breaking ciphers to gain a deeper understanding of their design.
Details will follow.
Keep in touch on Discord.
Details will follow.
You can find recordings of the 2020/21 lecture in a YouTube playlist.
The lecture slides are reasonably self-contained, but often briefly phrased.
If you prefer full-text resources, you may find some of the following books interesting:
- Serious Cryptography, by J.-P. Aumasson
- Introduction to Cryptography with Coding Theory, by W. Trappe, L.C. Washington
Lecture Exams (VO)
The VO exam is a written exam (for the main exam dates; alternatively, you can contact us for an oral exam any time). See above for COVID-19 plans.
We will ask 4 questions on different topics; you can find lists of example questions to test yourself on the last slide for each lecture.
Please find the exam dates and registration in TUGRAZonline.
Exercise Sheets (KU)
We recommend to visit the KU and VO of Cryptography in the same semester.
In the exercises, you practice the new topics in weekly exercise classes. The tasks are handed out after each week’s lectures, and due for the exercises of the following week, where one student will be selected to present the solution for each of the tasks. Thus, presence is mandatory if you tick any tasks.
You need to solve 50% of all examples to complete the KU. Use the Student Tick System (STicS) to tick the tasks you solved before each class. If you solve more than the required 50%, we will reward you with bonus points that are added to your exam results – for details, please check the lecture slides.
Most of the exercises are pen-and-paper thinking exercises, but each sheet includes a bonus challenge that will require some programming.
Exercise Exams (KU)
The grades for the KU are based on two exams (and the required 50% tick rate), plus bonus tasks. The dates and place are announced on this website. All students that participate at least in the first exam will receive a grade (positive or negative). There will be a “second-chance” exam at the end of the term. For details on the conditions, check the slides of the introductory lecture or ask us.