About

Defensive

We strongly believe that only combination of deep, low level defensive and offensive security skills can guarantee secure and successful deployments.

Our mission

At Defensive Security we focus on teaching you best practices in securing your Open Source infrastructures. Almost 15 years of experience, best ever training flow and high passion level guarantee you the best in the market of IT Security Education & Solution Services.

Why us

Our Certificates

Conferences

Brucon 2017/2018

BruCON is an annual security and hacker(*) conference organized in Belgium, providing two days of an interesting atmosphere for open discussions of critical infosec issues, privacy, information technology and its cultural/technical implications on society.

Exatel Security Days 2017

One of the best commercial IT Security Conference in Poland. In 2017 I presented: "May the data stay with U! - Network Data Exfiltration Techniques."

Confidence 2016

The most famous IT Security Conference in Poland since 2005. In 2016 I had a speak about "Honey(pot) flavored hunt for cyber enemy". CONFidence gathers 500 attendees each year.

PLNOG 2016

The biggest Polish Network Operators Group Conference. In 2016 I had a presentation "Yo, yo! It's us, packets! Catch us if you can."

OWASP Poland

Polish chapter of Open Web Application Security Project - non-profit organization focused on improving the security of software. In 2013 I was speaking about Web Application Firewall - "Mod security - does your WAF can do it?"

Open Source Day

The biggest Open Source Conference in Poland as well as in EMEA region. In years 2008-2014 I was going deeply into SELinux, Linux Hardening, Web Application Security and new features in Red Hat Enterprise Linux.

Atmosphere 2014

Atmosphere 2014 – Performance and Scalability (500+) - Warsaw: “Scalable and under control - open cloud architecture considering security standards.”

Why us

  • Almost 15 years of experience in IT security technology supporting the largest companies and institutions for implementation, consulting and technical training
  • 9 years of experience in teaching and transferring a technical knowledge and experience (number of trained persons: 500+, the average evaluation on a 1-5 scale: 4.9.
  • IT Security Architect with pentester’s passion and recognized expert of enterprise Open Source solutions.
  • Providing web application and infrastructure penetration tests
  • Specializing in Linux/OS hardening and defensive security of web application platforms
  • Known and respected trainer/examiner of Red Hat products in Poland (RHCA, RHCSS, RHCE)
  • The author of many IT Security workshops (ModSecurity, FreeIPA, SELinux, Linux Hardening).
  • Speaker at conferences: Confidence 2016 (“Honey(pot) flavored hunt for cyber enemy), PLNOG 2016 (“Yoyo! It’s us, packets! Catch us if you can”), NGSEC 2016 (“Many security layers for many defensive opportunities”), Open Source Day 2010/2011/2012/2013/2014, SysDay 2008 (“SELinux vs exploits”), Confitura 2014 (“Detection and elimination of threats in real time - OWASP Appsensor in action.”), Red Hat Roadshow 2014, OWASP Chapter Poland 2015(“Does your WAF can handle it?), ISSA InfoTrams 2015, BIN Gigacon 2015(“Mapping pentester's knowledge for the need to protect a critical IT infrastructure”).
  • An associate member of ISSA and OWASP Poland Poland.

If you need to get deep and broad knowledge in the scope of Defensive Security using Open Source software then don't hesitate and just grab for it - definitely worth to attend and meet Leszek in person and his experience during 3 days long comprehensive technical training. "

Wojciech Dworakowski CEO at SecuRing

Our clients include