About the Scientist

Christoph Coijanovic is a PhD student at the Chair of IT Security at KIT. His research focuses on providing provable privacy guarantees for anonymous communication, particularly in the context of group communication. In 2024, he completed a research visit to Kenny Paterson’s Applied Crypto group at ETH Zurich.

Supervised theses

Contact also via [Matrix]

Title	Person	Qualification	Graduation year
Evaluating Potential Attacks Against the Nym Network	Kristina Prpoš	Bachelor	2025
Towards Efficient Sender-Anonymity in Mobile Ad-Hoc Networks	Alexander Linder	Master	2024
Poodel — Anonymous Group Calls Based on Mix Networks	Robin Koenig	Master	2023
PolySphinx - Extending the Sphinx Mix Network with Better Multicast Support	Daniel Schadt	Master	2022
Towards Anonymus Group Voice Calls	Akim Romain Stark	Master	2022
Distinguishing Cover Traffic Through Timing Analysis at the Example of Vuvuzela	Dmitrii Kuklev	Bachelor	2022
Analysis and Improvement of Signal’s Group Communication	Sophie Bräuniger	Bachelor	2022
Analysis and comparison of privacy protection in cash and payment channel network protocols	Lennart Bunjes	Bachelor	2022
Störsignal: Adding Cover Traffic to the Signal Messaging App	Philip Rosenstock	Bachelor	2021
Evaluation von digitalen Signaturalalgorithmen hinsichtlich Signals Gruppenmanagement	Fritz Marvin Hund	Bachelor	2021

Courses
Title	Type	Semester
Privacy Enhancing Technologies	lecture	summer of 2025
Privacy Enhancing Technologies	lecture	summer of 2024
Privacy Enhancing Technologies	lecture	summer of 2023
Post-Quantum Cryptography	seminar	winter of 2022/2023

Publications

Aimless Onions: Mixing without Topology Information
Schadt, D.; Coijanovic, C.; Strufe, T.
2025. Proceedings on Privacy Enhancing Technologies, 2025 (4), 293–307. doi:10.56553/popets-2025-0131

Pirates: Anonymous Group Calls over Fully Untrusted Infrastructure
Coijanovic, C.; Stark, A.; Schadt, D.; Strufe, T.
2024. Information Security and Privacy – 29th Australasian Conference, ACISP 2024, Sydney, NSW, Australia, July 15–17, 2024, Proceedings, Part III. Ed.: T. Zhu, 193 – 212, Springer Nature Singapore. doi:10.1007/978-981-97-5101-3_11

Panini — Anonymous Anycast and an Instantiation
Coijanovic, C.; Weis, C.; Strufe, T.
2024. Computer Security – ESORICS 2023 – 28th European Symposium on Research in Computer Security : The Hague, The Netherlands, September 25–29, 2023, Proceedings, Part II. Ed.: G. Tsudik, 193 – 211, Springer, Cham. doi:10.1007/978-3-031-51476-0_10

BAZAAR: Anonymous Resource Sharing
Coijanovic, C.; Schadt, D.; Weis, C.; Strufe, T.
2023. WPES ’23: Proceedings of the 22nd Workshop on Privacy in the Electronic Society, Kopenhagen, 26th November 2023, 135–139, Association for Computing Machinery (ACM). doi:10.1145/3603216.3624957

PolySphinx: Extending the Sphinx Mix Format With Better Multicast Support
Schadt, D.; Coijanovic, C.; Weis, C.; Strufe, T.
2024. 2024 IEEE Symposium on Security and Privacy (SP), 44–44, IEEE Computer Society. doi:10.1109/SP54263.2024.00044

2PPS – Publish/Subscribe with Provable Privacy
Abdelwahab Gaballah, S.; Coijanovic, C.; Strufe, T.; Mühlhäuser, M.
2021. 40th International Symposium on Reliable Distributed Systems (SRDS), Chicago, IL, USA, 20-23 Sept. 2021. Vol.: 1, 198–209, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/SRDS53918.2021.00028