Seminar Advanced Topics in Cryptography

This course is listed

• in Aachen RWTHonline as Seminar Advanced Topics in Cryptography,
• in Bonn Basis as MA-INF 1209 - Seminar Advanced Topics in Cryptography.

Lecture

Michael Nüsken

Time & Place

Please, send an email if you are interested in this seminar.

• Tuesday, 14⁰⁰-16⁰⁰, digital seminar room.

Kick-off meeting: Tuesday, 13 April 2021, 14⁰⁰, digital seminar room.

Contents

Research front at the cryptographic preprint service ePrint.

Each participiant suggests three papers from ePrint, one of which is chosen. You then present your chosen paper in a session together with necessary background and deliver a report.

Schedule

• Tuesday, 1 June 2021. Philipp Holzmann & Dorian Reineccius.
  Intermediate lab report: About securing federated learning.
   
• Tuesday, 8 June 2021. Philipp Holzmann.
  Breaking the Diffie-Hellman style key exchange 'MAKE' with a linear algebra attack..
  Report.
  Based on:
  • Daniel Brown and Neal Koblitz and Jason LeGrow (2021). Cryptanalysis of `MAKE'. ePrint 2021/465.
• Tuesday, 15 June 2021. Maximilian Houben.
  Title tba.
  
  based on:
  • Takanori Isobe and Ryoma Ito and Kazuhiko Minematsu (2021). Security Analysis of SFrame. ePrint 2021/424.
• Tuesday, 22 June 2021. Tommy Astheimer.
  Creating a backdoor trapped cipher: A plea to strengthen the burdens of provable security.
  
  Based on:
  • Raluca Posteuca and Tomer Ashur (2021). How to Backdoor a Cipher. ePrint 2021/442.
• Tuesday, 29 June 2021. Roman Pleskovsky.
  Introduction of current development in Private Information Retrieval.
  
  Based on:
  • Dmitry Kogan and Henry Corrigan-Gibbs (2021). Private Blocklist Lookups with Checklist. ePrint 2021/345.
• Friday 9 July 2021, 12⁰⁰. Richard Palme.
  Breaking CKKS with a Passive Attack - A Case Study on a Pitfall of Provable Security.
  Slides. Report.
  Based on:
  • Baiyu Li and Daniele Micciancio (2020). On the Security of Homomorphic Encryption on Approximate Numbers. ePrint 2020/1533.
  Note added 2022-09-05: In the following answer a proposed mitigation is discussed and also how it enters various several libraries implementing CKKS.

  • Jung Hee Cheon, Seungwan Hong & Duhyeong Kim (2020). Remark on the Security of CKKS Scheme in Practice. ePrint 2020/1581.

• Friday 16 July 2021, 12⁰⁰. Sebastian Burfeid.
  E2EE Protocol for Zoom Meetings.
  Slides (PDF). Report (PDF).
  Based on:
  • Takanori Isobe and Ryoma Ito (2021). Security Analysis of End-to-End Encryption for Zoom Meetings. ePrint 2021/486.
• Friday 23 July 2021, 12⁰⁰. Philipp Holzmann & Dorian Reineccius.
  Final lab report: About securing federated learning.
  
  Based on:
  • tba.

Prerequisites

Basic knowledge of cryptography and fast understanding of mathematical and computer science topics is required.

Allocation

2 SWS.

• Master in Media Informatics: Computer and Communication Technology.
  4 ECTS credits.
  Students have to register this course in RWTHonline.
• Master in Computer Science at University of Bonn: MA-INF 1209.
  4 CP.
  Students have to register this course in BASIS.