\section*{List of Other Contributions} Throughout and before my PhD studies, I also contributed to the following: \begin{itemize} \item The Sigsum Project. \url{https://www.sigsum.org/} (2020-present). Sigsum is a free and open-source software project that brings transparency to signed checksums. The design is simple and uses a proactive gossip-audit model. I founded Sigsum with Linus Nordberg and Fredrik Str\"{o}mberg while working at Mullvad VPN as a side-line occupation. \item Tobias Pulls and \textbf{Rasmus Dahlberg}. Steady: A Simple End-to-End Secure Logging System. NordSec (2018). Tobias was the main driver. I mostly contributed with design discussions and a security formalization. \item \textbf{Rasmus Dahlberg}, Tobias Pulls, and Roel Peeters. Efficient Sparse Merkle Trees: Caching Strategies and Secure (Non-)Membership Proofs. NordSec (2016). This work started with my Bachelor's thesis. I did most writing with input from Tobias and Roel. Tobias did our benchmarking experiments. \item \textbf{Rasmus Dahlberg} and Tobias Pulls. Standardized Syslog Processing: Revisiting Secure Reliable Data Transfer and Message Compression. Technical Report, Karlstad University (2016). I was the main driver. Tobias contributed with continuous feedback. \end{itemize}