Even though the lecture deepens and continues topics discussed in Cryptography I, it is not a prerequisite to have attended this lecture. The lecture Cryptography II can be studied without any prior knowledge on cryptography - all necessary basics are shortly recapitulated.

The goal of this lecture is to present and discuss important scientific concepts from modern cryptography. This includes

• Security Definitions: How can the security of cryptographic schemes formally defined?
• Proofs of Security: How can the security of cryptographic schemes be proven (based on precise assumptions)?
• Cryptanalysis: What are the established techniques to analyze cryptographic mechanisms?
• Elliptic Curves
• Zero-Knowledge Proofs

After the lecture, the students should understand relevant scientifc concepts of cryptography and be ready to read state-of-the-art research literature.

Cryptography II will take place as an inverted lecture. This means that the lecture itself has been pre-recorded and the videos are made available. One a weekly or bi-weekly basis, there will be an online meeting where the content will be discussed and questions will be clarified. The videos and slides are available in ILIAS.

Important dates (Zoom-links are found in ILIAS):

• Kick-off meeting: Monday, 28 September, 17:15
• Online meetings: every second Thursday, 10:15-11:45