kaczmarczyck
Software Engineer at google
Switzerland
Summary
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RockstarSoftware Engineer with 6 years of experience based in Switzerland and currently contributing at Google, focused on back-end systems and applied cryptography. Notable open-source work includes extending HMAC-secret support in the well-regarded google/OpenSK Rust project, implementing salt decryption and secure output encryption to integrate cryptographic features into FIDO2/U2F flows. Comfortable operating at low system levels—bridging protocol design, secure key handling, and practical integration into existing architectures. Pragmatic problem-solver who delivers security-sensitive changes that improve real-world authentication devices.
6 years of coding experience
Github Skills (8)
rust10
hmac10
cryptography10
security10
fido9
sys9
embedded9
cbor8
Programming languages (6)
Github contributions (5)
google/OpenSK
Feb 2020 - Jan 2023
OpenSK is an open-source implementation for security keys written in Rust that supports both FIDO U2F and FIDO2 standards.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1153 reviews, 308 commits, 492 PRs in 2 years 11 months
Contributions summary:kaczmarczyck's commits focus on implementing and extending the HMAC-secret extension for the OpenSK security key project. Their contributions include adding support for HMAC secret salt decryption, implementing HMAC secret output encryption and decryption, and integrating HMAC secret functionality into the make and get assertion processes. These changes enhance the security key's functionality by incorporating a new cryptographic feature, demonstrating a focus on low-level cryptography and integration within the project's existing architecture.
nrf52840hardwareu2fcryptographyfirmware
kaczmarczyck/OpenSK
Jun 2020 - Aug 2022
OpenSK is an open-source implementation for security keys written in Rust that supports both FIDO U2F and FIDO2 standards.
Contributions:7 reviews, 7 commits, 13 PRs in 2 years 1 month
cryptographypamyubikeyrustsecurity
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