Søren Eller Thomsen
Table of Contents
About Me
I am a Senior Cryptographic Engineer at Partisia, where I work on applied cryptography — primarily multi-party computation, zero-knowledge proofs, and blockchain protocols. More recently I have become increasingly interested in digital identity: how people can prove things about themselves, share credentials, and interact with institutions without giving up more information than strictly necessary. This has drawn me into self-sovereign identity systems and the technical standards being developed for the EU Digital Identity Wallet.
Before joining Partisia, I worked at the Alexandra Institute, where I was involved in designing privacy-enhancing systems and carrying out security analyses.
I completed my PhD in computer science at Aarhus University, supervised by Jesper Buus Nielsen, where I also did my undergraduate studies. My research focused on the security of peer-to-peer networks and consensus protocols in the blockchain setting.
Contact
E-mail: soren.eller.thomsen@partisia.com
Manuscripts and Publications
Peer-to-peer Networks
- Optimistic Message Dissemination
Chen-Da Liu-Zhang, Christian Matt, and Søren Eller Thomsen.
Manuscript.
PDF - BibTeX - Asymptotically Optimal Message Dissemination with Applications to Blockchains
Chen-Da Liu-Zhang, Christian Matt, and Søren Eller Thomsen.
Advances in Cryptology - EUROCRYPT 2024.
PDF - BibTeX - Slides - Practical Provably Secure Flooding for Blockchains
Chen-Da Liu-Zhang, Christian Matt, Ueli Maurer, Guilherme Rito, and Søren Eller Thomsen.
Advances in Cryptology - ASIACRYPT 2022.
PDF - BibTeX - Slides - GitHub - Trailer - Video - Formalizing Delayed Adaptive Corruptions and the Security of Flooding Networks
Christian Matt, Jesper Buus Nielsen, and Søren Eller Thomsen.
Advances in Cryptology - CRYPTO 2022.
PDF - BibTeX - Slides - Trailer - Video
Consensus
- Enig: Player Replaceable Finality Layers with Optimal Validity
Simon Holmgaard Kamp, Jesper Buus Nielsen, Søren Eller Thomsen, and Daniel Tschudi. 2022.
PDF - BibTeX - Weight-Based Nakamoto-Style Blockchains
Simon Holmgaard Kamp, Bernardo Magri, Christian Matt, Jesper Buus Nielsen, Søren Eller Thomsen, and Daniel Tschudi.
Progress in Cryptology - LATINCRYPT 2021.
PDF - BibTeX - Slides - Trailer - Video - Formalizing Nakamoto-Style Proof of Stake
Søren Eller Thomsen and Bas Spitters.
IEEE 34th Computer Security Foundations Symposium (CSF), 2021.
PDF - BibTeX - Slides - GitHub - Video
PhD Thesis
Message Dissemination in the Nakamoto Era
Søren Eller Thomsen.
Aarhus University, January 2023.
Supervised by professor Jesper Buus Nielsen.
Assessed by professor Juan Garay and professor Julian Loss.
PDF