Michał Trojnara
Penetration Test Specialist
Warsaw, Masovian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolMichał Trojnara is a seasoned penetration test specialist and free-software developer with 27 years of experience in network and embedded security, currently testing Sony services and maintaining stunnel, the widely used TLS encrypting proxy he authored. He combines deep reverse-engineering and cryptography expertise—from TrustZone/kernel exploits and DRM analysis to Authenticode signing work on osslsigncode—with hands-on leadership of pentest teams and lab environments. His background spans financial and telecom risk assessment (ABN AMRO, RBS, PTK Centertel) through to embedded firmware and client devices, and he authored Sony’s internal SSL/TLS implementation standard. Based in Warsaw, he bridges rigorous academic training in cryptography (PhD) with practical code-level contributions that modernize crypto tooling and integrate with projects like SoftHSM2.
27 years of coding experience
2 years of employment as a software developer
BSc, Information Systems and Decision Support, BSc, Information Systems and Decision Support at Warsaw University of Technology
Polish, English, Russian, Spanish
Github Skills (10)
crypto10
crypt10
c-library10
c-programming10
libcrypto10
openssl10
cryptography10
security10
pkcs9
command-line-interface8
Programming languages (7)
Github contributions (5)
mtrojnar/osslsigncode
Nov 2018 - Jan 2023
OpenSSL based Authenticode signing for PE/MSI/Java CAB files
Role in this project:
Backend Developer
Backend DeveloperContributions:10 releases, 13 reviews, 109 commits in 4 years 2 months
Contributions summary:Michał primarily focused on porting the `osslsigncode` project to utilize OpenSSL 1.1.x, updating the codebase to leverage newer cryptographic libraries and features. Their contributions included changes to the core C source files to reflect the necessary API adjustments for the OpenSSL upgrade. Additional work involved adapting the project to integrate with SoftHSM2 and fixing PKCS11 module path names within the example configuration files.
msicryptographysigningsignature-padsecurity
mtrojnar/stunnel
Jul 2015 - Nov 2022
Public repository based on official releases. This repository is *not* used for active development. Do *not* submit pull requests.
Contributions:2 reviews, 208 commits, 16 PRs in 7 years 4 months
public-repositorysslencryptionopenssl
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