Steffan Karger
Security Nerd at mod 2
The Hague, South Holland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolSteffan Karger is a security-focused engineer with 13 years of experience designing and defending high-assurance systems from The Hague. He has deep hands-on expertise spanning embedded secure communication, incident response and ransomware recovery, and organization-wide risk and governance work from long tenures at Fox-IT and now as Security Nerd at mod 2. Steffan’s development pedigree includes contributing to the widely used OpenVPN project — adding TLS 1.3 support, improving TLS/SSL backends, and hardening key generation and cipher negotiation — reflecting a rare blend of protocol-level cryptography and practical incident-forensics skills. He pairs an MSc in Embedded Systems with a pragmatic history of building secure networking stacks and embedded devices for hostile environments. Colleagues rely on him for translating complex security requirements into auditable, operational controls and for calm leadership during crisis response.
13 years of coding experience
4 years of employment as a software developer
Msc Embedded Systems, Msc Embedded Systems at Delft University of Technology
English, German, Dutch
Stackoverflow
119reputation
189reached
1answer
1question
Github Skills (14)
it-security10
ssl10
tls1210
c-programming10
openvpn10
tls1310
cryptography10
security10
mbedtls9
gcc6
clang6
android-library6
constants6
android6
Programming languages (6)
Github contributions (5)
OpenVPN/openvpn
Mar 2013 - Mar 2021
OpenVPN is an open source VPN daemon
Role in this project:
Back-end & Security Engineer
Back-end & Security EngineerContributions:534 commits, 5 PRs, 43 pushes in 8 years 1 month
Contributions summary:Steffan primarily focused on enhancing the security and functionality of the OpenVPN codebase. They made significant contributions to the TLS/SSL backend, including implementing support for TLS 1.3, improving error reporting and error handling. They also refactored the key generation code and added client-side support for cipher negotiation.
securityvpndaemonwireguardopenvpn
syzzer/openvpn
May 2017 - Oct 2018
Contributions:8 commits, 68 pushes, 57 branches in 1 year 4 months
daemonvpnwireguardopenvpn
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