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---
title: "rgdd.se"
---
{{< figure class="avatar" src="img/author.jpg" alt="avatar">}}
Software engineer and computer scientist based in Stockholm, Sweden. I lead the
open-source work at [Glasklar Teknik][], a sister company of [Mullvad VPN][] and
[Tillitis][]. Some of the topics I'm passionate about include cryptography,
Linux, privacy, programming in Bash/C/Go, and transparency logs. The last few
years I got into self hosting. The overlap between research, development, and
operations is fun.
[Glasklar Teknik]: https://www.glasklarteknik.se/
[Mullvad VPN]: https://www.mullvad.net/
[Tillitis]: https://www.tillitis.se/
Off work you will find me reading books, playing boardgames with friends,
improving my cooking skills, cruising around on inlines, running, and such.
## Project involvement
I am a member of the following projects:
- [C2SP][]: a project that facilitates maintenance of cryptographic
specifications using software development methodologies rather than IETF-like
consensus.
- [Sigsum][]: a free and open source software project that makes a signer's
key-usage transparent. It can be used as a building block to secure the
supply chain and more.
- [System Transparency][]: an open source project that provides a security
architecture for bare metal servers. A system's entire boot chain becomes
protected and auditable.
- [Tor][]: a 501(c)(3) US nonprofit that advance human rights and defend online
privacy through free software and open networks.
- [Witness Network][]: a community effort that gets transparency logs
cosigned.
[C2SP]: https://c2sp.org/
[Sigsum]: https://www.sigsum.org/
[System Transparency]: https://www.system-transparency.org/
[Tor]: https://www.torproject.org/
[Witness Network]: https://witness-network.org/
## Selected software
I develop and maintain software on my free time. You might be interested in:
- [silentct][]: a Certificate Transparency monitor that filters out the noise.
- [onion-csr][]: a tool to domain-validate onion addresses with CAs.
[silentct]: https://git.glasklar.is/rgdd/silentct
[onion-csr]: https://gitlab.torproject.org/tpo/onion-services/sauteed-onions/onion-csr
## Selected publications
I don't publish much papers these days, but here's an aging selection:
- Rasmus Dahlberg.
[On Certificate Transparency Verification and Unlinkability of Websites Visited by Tor Users](https://www.diva-portal.org/smash/get/diva2:1751660/FULLTEXT02.pdf).
PhD thesis, Karlstad University (2023)
- Rasmus Dahlberg and Tobias Pulls.
[Timeless Timing Attacks and Preload Defenses in Tor's DNS Cache](https://www.usenix.org/conference/usenixsecurity23/presentation/dahlberg).
USENIX Security (2023)
- Rasmus Dahlberg, Tobias Pulls, Tom Ritter, and Paul Syverson.
[Privacy-Preserving \& Incrementally-Deployable Support for Certificate Transparency in Tor](https://petsymposium.org/2021/files/papers/issue2/popets-2021-0024.pdf).
PETS (2021)
- Tobias Pulls and Rasmus Dahlberg.
[Website Fingerprinting with Website Oracles](https://petsymposium.org/2020/files/papers/issue1/popets-2020-0013.pdf).
PETS (2020)
- Tobias Pulls and Rasmus Dahlberg.
[Steady: A Simple End-to-End Secure Logging System](https://eprint.iacr.org/2018/737.pdf).
NordSec (2018)
## Contact
Feel free to reach out on email or other platforms as you see fit.
|
