Recurity Labs

Recurity Labs has been a partner of RootSys GmbH since a long time and both parties benefit from mutual cooperation and collaboration.

Recurity Labs specializes in IT-security consulting services, focusing on the most important angles of software and system security: the design and verification of expected behaviour.

Recurity Labs supports in designing protocols as well as software and system solutions that can withstand most-common forms of attacks, tolerate the ones they cannot withstand and contain the ones they cannot tolerate. These guiding principles are also applied for thorough and professional set-up, executed and documented verifications of designs and code security.

The aim of Recurity Labs' consulting is to provide the highest possible level and quality of work. Our both feet on the ground approach concentrates on issues and solutions, preventing exaggeration and downplay. We excel at putting the results of our detailed and dependable analysis in a grand perspective, while always providing realistic approaches for improvements.


RootSys GmbH and Cure53 are in a strong and successful partnership since 2020 and have been actively working together on numerous customer projects.

Cure53 was founded in February 2007 and has since grown to include a small and dedicated team of experts versed in solving multifaceted technical challenges in the information security field. As of 2020, Cure53 works with a total of twenty consulting researchers, who boast considerable expertise in web security, browser security, cryptography, operating system & infrastructure security, server security and application security, thus covering a wide yet carefully scoped portfolio of services.

X41 D-SEC GmbH

Since 2020 we at RootSys GmbH and X41 have been actively working together on customer projects.

X41 D-Sec GmbH is an expert provider for application security and penetration testing services. Having extensive industry experience and expertise in the area of information security, a strong core security team of world-class security experts enables X41 D-Sec GmbH to perform premium security services.


NSIDE ATTACK LOGIC (or NSIDE for short) and RootSys GmbH are in a strong business relationship in the field of IT security and penetration testing since 2022.

NSIDE ATTACK LOGIC was founded in 2014 by IT security veterans with a vision: to test security in a technically sophisticated and realistic way, thus protecting large, mid-sized and small companies, government agencies and other organizations from experienced attackers.

NSIDE embodies a paradigm shift – away from exclusively technical analysis to strategic thinking in an ‘Attacker’s Mindset’. This realism and a strong focus on the attacker’s perspective is what sets NSIDE apart and what our clients value.

A lot of discipline, creativity and an unquenchable thirst for knowledge has helped the NSIDE team to grow from the original 3 founding members to almost 25 employees now.

NSIDE’s customer base includes almost 250 companies of all sizes and industries. Smaller medium-sized companies are represented as well as 14 DAX companies. NSIDE supports companies in a wide range of business areas including the IT, telecommunications, mechanical engineering and automation, manufacturing, finance and insurance, healthcare, chemicals, energy and utilities, and media sectors. Increasingly, the services of NSIDE are also specifically requested by authorities from public administration and the security sector.