Amber Sprenkels
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I am a software engineer specialized in cryptography, currently working at Polars.

I recently finished my PhD thesis which was on the implementation of the ML-DSA signature scheme on Cortex-M3, Cortex-M4, and other embedded plaforms. Apart from crypto implementation and embedded systems, I sometimes work on simple websites, small crafting projects, and I enjoy rock climbing. Very occasionally I might write a blog post about something I learned or experienced. My pronouns are she/they.

Latest blog posts

Publications and technical reports

  • Warp Drive Engineering: Implementing and optimizing the Dilithium signature scheme. Amber Sprenkels, PhD thesis [pdf]
  • Post-Quantum Secure Boot on Vehicle Network Processors. Joppe W. Bos, Brian Carlson, Joost Renes, Marius Rotaru, Amber Sprenkels, Geoffrey P. Waters. 20th escar Europe – The World's Leading Automotive Cyber Security Conference, pp. 112–125, Ruhr-Universität Bochum [paper]
  • Dilithium for Memory Constrained Devices. Joppe W. Bos, Joost Renes, Amber Sprenkels. Progress in Cryptology – AFRICACRYPT 2022, LNCS, vol. 13503, pp. 1–19, Springer [paper]
  • Faster Kyber and Dilithium on the Cortex-M4. Amin Abdulrahman, Vincent Hwang, Matthias J. Kannwischer, Amber Sprenkels. ACNS 2022: Applied Cryptography and Network Security, LNCS, vol. 13269, pp. 853–871, Springer [paper]
  • Don't throw your nonces out with the bathwater: Speeding up Dilithium by reusing the tail of \(\mathbf{y}\). Amber Sprenkels, Bas Westerbaan. Cryptology ePrint Archive, Report 2020/1158 [paper]
  • Compact Dilithium Implementations on Cortex-M3 and Cortex-M4. Denisa O. C. Greconici, Matthias J. Kannwischer, Amber Sprenkels. IACR Transactions on Cryptographic Hardware and Embedded Systems (TCHES), 2021(1):1–24 [paper|code]
  • Assembly or Optimized C for Lightweight Cryptography on RISC-V? Fabio Campos, Lars Jellema, Mauk Lemmen, Lars Müller, Amber Sprenkels, Benoit Viguier. CANS 2020: Cryptology and Network Security, LNCS, vol. 12579, pp. 526–545, Springer [paper]
  • The complete cost of cofactor \(h=1\). Peter Schwabe, Amber Sprenkels. Progress in Cryptology – IndoCrypt 2019, LNCS, vol. 11898, pp. 375–397, Springer [paper|code]
  • ECC implementation on Sandy Bridge Amber Sprenkels. Master thesis [pdf|code]

Slides & posters

Code