Homepage

My name is Tjerand. I am a third year PhD student in cryptography at the Department of Mathematical Sciences at the Norwegian University of Science and Technology (NTNU) in Trondheim, where I am a member of the NTNU Applied Cryptology Lab. My supervisor is Professor Kristian Gjøsteen. I am also working as a cryptography advisor at Pone Biometrics.

Note: I am currently visiting Professor Jonathan Katz at the University of Maryland, USA.

My main foci of research are lattice-based cryptography and zero-knowledge protocols. My interests also span the areas of secure multiparty computation, homomorphic encryption, password-authenticated key exchange, electronic voting and anonymous communication.

I graduated from NTNU with a B.Sc. in Mathematics in 2017 and a M.Sc. in Mathematics in 2020, respectively. I spent the academic year 2017-2018 at UC Berkeley, California, USA, and
I spent the fall of 2020 visiting the Aarhus Crypto Group at Aarhus University, Denmark.

I have previously been working as a project manager at Lær Kidsa Koding (2015-17), as a university college teacher at Western Norway University of Applied Sciences (2017-20), and I had a 3 months internship in 2018 at the IoT-security company Intrinsic-ID in Eindhoven, NL.

I am a member of the International Association for Cryptologic Research (IACR).

News:

• Short Paper: Verifiable Decryption for BGV, is accepted at Voting 2022.
• Paper: Anonymous Tokens with Public Metadata and Applications to Private Contact Tracing, is accepted at Financial Crypto 2022. Joint work with Martin Strand.
• I am happy to announce that I will start a three-year post doc at NTNU in August 2022!
• Our project “OffPAD – Optimizing balance between high security and usability” got funded 16M NOK by the Norwegian Research Council for research on lightweight and PQ crypto.
• Manuscript: Verifiable Decryption in the Head, is available on IACR ePrint. Joint work with Kristian Gjøsteen, Thomas Haines, Johannes Müller and Peter Rønne.
• Henrik Walker Moe, Martin Strand and myself won the “Built-in-privacy” award from the Norwegian Data Protection Authority for our work on improved privacy in contact tracing.
• Paper: Lattice-Based Proof of Shuffle and Applications to Electronic Voting, is accepted at CT-RSA. Joint work w/ Diego F. Aranha, Carsten Baum, Kristian Gjøsteen and Thor Tunge.

I support the Electronic Frontier Foundation, the Tor Project and the Signal Foundation.