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What is CHECK?

Penetration testing is a vital to confirming the resilience and effectiveness of security systems – and to pass your PSN IT Health Check. For any public body that lacks the relevant cybersecurity skills in house, the National Cyber Security Centre (NCSC) has introduced CHECK – a scheme for verifying trusted third parties who can perform the necessary penetration tests on your behalf.

Every CHECK certified business – like Fidus – employ engineers who hold NCSC approved certifications, and who are skilled in conducting authorised penetration tests. The results of any CHECK penetration testing will result in a standardised report built to NCSC specifications.

Why does CHECK matter?


Penetration testing is vital

Your security defences are critical to protecting the sensitive data you store. But it is only with penetration testing that you confirm technology and processes are effective.


CHECK verifies a provider’s capabilities

CHECK verified providers have been approved by the NCSC and are trusted to work with sensitive data and systems.


Reduces your overheads

Outsourced penetration testing allows your in-house team to focus on other strategic projects without compromising the quality or depth of the assessment.


A stepping stone to certification

Proving the resilience of your IT security is essential to achieving key public body certifications, including NHS DSP and ITHC.

Our Approach

Penetration testing

CHECK qualified engineers ‘attack’ your firewall and network assets to prove that defences are properly configured and secured against unauthorised network incursions.

Physical security testing

Cybercriminals may also come through the front door – literally. Fidus engineers will test the systems and processes that control physical access to your sites.

Phishing and social engineering attacks

Fidus consultants will use common social engineering techniques like phishing emails to elicit sensitive data and passwords direct from employees, exposing urgent training requirements.

Red Team scenarios

To gain a complete understanding of security provisions, our engineers can conduct a full-scale cyberattack to test your use of people, processes and technology.

Talk to us about CHECK testing today

Get in Touch

Why Fidus?

Penetration testing reveals your most sensitive network vulnerabilities – so you need a partner you can trust. Fidus Information Security are an NCSC CHECK Green Light and TIGER scheme approved consultancy. Our cyber security experts hold some of the most recognised certifications in the industry, including CREST Certified Tester and Senior Security Tester. Fidus is also a Cyber Essentials verified company. Every assessment we perform is carried out according to UK industry approved methodologies (OWASP, PETS, NIST) along with our own internal testing frameworks.

Remedial Support

More than just identifying security vulnerabilities, our cyber security experts are on hand to help you fix them too.

Certified Security Consultants

Our CREST and TIGER approved team holds a range of industry-leading security certifications including OSCP, CCT, SST and CISSP

Easy to Understand Reports

We’ll ensure that your executives and technical teams properly understand our assessment findings using plain-English reporting.

Fixed Price Proposals

The price you’re quoted is the price you’ll pay. Our quotes are broken down into a detailed costing table so you know exactly what to expect.

The Industry Average

Other approaches we've witnessed have included convoluted steps and commonly ends with incorrect information being handed to the consultant assigned to the engagement.

The Fidus Way

Our approach to security involves a qualified security consultant through the entire process to ensure quality, accuracy and consistency.

Trusted by

Get in Touch with Fidus Information Security

From the Blog

All Articles
Research 22 March 2021
Silently Unmasking Virgin Media VPN Users in Seconds (CVE-2019-16651)

Introduction Fidus’ R&D team identified a vulnerability within Virgin Media Super Hub 3 routers that permitted for exfiltration of sensitive information remotely, which, among other things, can be used to determine the actual, ISP issued IP address of VPN users. A vulnerability we were asked to hold back from releasing for a whole year. A […]

Research 20 March 2020
XSSLash – A Tale of Playing Quiplash at Work

Introduction Quiplash – a game full of wit, banter and borderline acceptable humour… and security consultants on a lunch break. To set the scene, the date was 19th February 2020 and the mood was cheerful in the Fidus office. Lunch had just been delivered and today was the day that Mario Kart was not going […]

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    “Oysta is very happy with the support, service and dedication of the Fidus team. Working with the Oysta team every step of the way, not only did they check all security on the device, they also provided feedback on the quality of the hardware. I will be working with Fidus again.”

    Mario Zuccaro, Founder and CEO, Oysta Technology

    June 2019

    “We have been really pleased with the service provided by Fidus. We have found them to be extremely easy to work with. We also felt their fee structure was reasonable. We would recommend Fidus to anyone looking for a PCI pen testing partner.”

    Andy Phillips, Inspired Outsourcing

    May 2019

    “Great service. Gave us exactly what we needed, as promised.”

    Philip Cunnington, TalkPlus NHS

    January 2019

    “We were extremely pleased with the service, knowledge and professionalism shown by Fidus. After the remediation phase, we then ran a phishing exercise with them to remind staff of the need to be vigilant with external email communications. I would have no hesitation in using or recommending Fidus in the future due to the quality of work carried out at a great price.”

    Graeme Thistlethwaite, ICT, Business Change and Business Support Manager

    “Fidus provided a high quality penetration service at a reasonable price … communications were great … the Pen test team flexed around us and our other commitments to get the job done. Thanks!”

    Darren Crombie, CEO, Upstream Outcomes

    October 2018