Frank Breedijk
CISO at DIVD Dutch Institute for Vulnerability Disclosure
North Holland, Netherlands
Summary
👤
Senior🎓
Top SchoolFrank Breedijk is a seasoned CISO with 15+ years securing mission-critical IT for Dutch blue-chip customers, currently leading security strategy, compliance and business development at Schuberg Philis. He co-founded and grew DIVD’s CSIRT and helps run Het Nederlands Security Meldpunt, channeling responsible vulnerability disclosure into national cyber resilience. Equally comfortable with C-level risk conversations and hands-on engineering, he has built tooling such as Seccubus and contributed to the widely used testssl.sh project to improve TLS testing and client simulations. A frequent public speaker and crisis manager, he combines operational incident experience with a long track record of building scalable vulnerability management processes.
15 years of coding experience
9 years of employment as a software developer
Alkwaard CollegeBSC Information Technology, BSC Information Technology at De Haagse Hogeschool / The Hague University of Applied SciencesScouting RMG
English, Dutch, German
Github Skills (17)
ssl10
tls1210
scripting10
testing10
tls1310
security10
mtls10
script10
openssl10
libtls10
sh10
shell10
test-automation10
block-cipher9
caesar-cipher9
Programming languages (16)
Github contributions (5)
testssl/testssl.sh
Dec 2015 - Dec 2017
Testing TLS/SSL encryption anywhere on any port
Role in this project:
Security Engineer & Test Automation Engineer
Security Engineer & Test Automation EngineerContributions:34 commits, 21 PRs, 85 comments in 1 year 11 months
Contributions summary:Frank primarily focuses on enhancing and maintaining the `testssl.sh` tool, evident in their contributions. They refactored and improved the test output, especially regarding redirects, file output, and mass testing. Moreover, they implemented and refined client simulations, expanding test coverage based on client capabilities and incorporating HPKP checks.
rc4drownopenssltlsanywhere
DIVD-NL/cna-bot
Nov 2022 - May 2024
GitHub action to validate and submit CVE entries using cvelib, cvelint and cve service.
Contributions:28 releases, 13 reviews, 107 PRs in 1 year 7 months
security-toolssecuritycvejson5submit
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