Caffeinated Petručeņa

Hi! I’m Krišjānis Petručeņa. I work at the Institute of Mathematics and Computer Science, University of Latvia (IMCS, UL) as a research assistant. I spend my time frustrated by quantum-safe communication, software architecture, and confidential computing. As a hobby, I host an archive of latvian informatics olympiad problems (LIO) at programme.lv.

Blog

Notes on engineering, security, olympiad work, and occasional project retrospectives.

Latvia at BOI 2026 (Espoo) - Latvia has participated in the Baltic Olympiad in Informatics since 1995. BOI 2026 took place in the Helsinki metropolitan area (Aalto University, Espoo), and the Latvian team returned with three bronze medals.
Problems with ETSI GS QKD 014 v1.1.1 - Quantum Key Delivery (QKD) can detect eavesdropping on a communication channel. ETSI GS QKD 014 helped standardize QKD key delivery northbound API, but its model is too narrow. This post argues that the standard underspecifies SAE identity binding, authorization, key sizing, bulk delivery, and buffering.

Research

Peer-reviewed publications and preprints. Short summaries and details visible in detailed view (on click).

Topology-Oblivious Random-Walk Key Relaying in Quantum Key Distribution Networks (2026)
Preprints. K. Petručeņa, S. Kozlovičs, J. Vīksna, E. Kalniņa, R. Isaks, E. Celms, L. Lāce, E. Rencis.
The Butterfly Protocol: Secure Symmetric Key Exchange and Mutual Authentication via Remote QKD Nodes (2026)
Symmetry. S. Kozlovičs, E. Kalniņa, J. Vīksna, K. Petručeņa, E. Rencis.
Integrating Remote Quantum Random Number Generator as a Shared Resource into GNU/Linux via D-Bus (2025)
ACM Transactions on Privacy and Security. K. Petručeņa, S. Kozlovičs, E. Kalniņa, E. Rencis, J. Vīksna, E. Celms, L. Lāce.
Integration of PQC and QKD: Applications, Challenges and Implementation Frameworks (2025)
Conference proceedings. E. Kalnina, R. Balodis, E. Celms, S. Kozlovics, I. Opmane, K. Petručeņa, E. Rencis, J. Viksna.
An Information-Theoretically Secure QKD Protocol for One-Time Pad Encryption (2025)
Conference proceedings. S. Kozlovičs, K. Petručeņa, J. Vīksna.
Towards Quantum Telecommunications: Point of View of the Implementation Task of the Experimental Quantum Key Distribution Backbone Deployment Project (2024)
Frontiers in Artificial Intelligence and Applications. I. Opmane, R. Balodis, A. Bulavs, E. Celms, E. Kalnina, R. Kucinska, A. Medenis, S. Kozlovics, K. Petručeņa, E. Rencis, J. Viksna.
Hybrid QKD-based framework for secure enterprise communication system (2024)
Procedia Computer Science. E. Rencis, J. Vīksna, S. Kozlovičs, E. Celms, D. Jānis Lāriņš, K. Petručeņa.
Quantum Key Distribution as a Service and Its Injection into TLS (2023)
Conference proceedings. S. Kozlovičs, K. Petručeņa, D. Lāriņš, J. Vīksna.