Capture the Flag (CTF)

Who is this course for?

We generally organise Capture the Flag (CTF) workshops for complete development teams, in which they battle against each other to solve as many challenges as possible. This is not a traditional course but a hands-on challenge workshop in which developers can test and use the hacking and development skills they have learned in a competitive setting.

Why should you take this workshop?

Capture the Flag is a collection of hacking challenges in which you try to gain as many points as possible in small teams. It is often used by hackers to test their hacking skills and to train in a challenging, competitive (and legal) manner. For development teams, a CTF can be used to enhance the hacker mindset and increase enthusiasm for secure development. The security knowledge acquired can also be practised further during the various security courses.


After this Capture the Flag exercise, you will have an even greater ability to look at applications with a hacker mindset. You will learn to use your developer skills in a creative way to capture digital flags and so look at code and applications with new eyes. As a result, you will grow further as a secure developer, you will be able to build more secure software applications and, what’s more, you’ll have a fun day out with your development team.


A Computest CTF is always supervised by one or more table coaches and the challenges are developed and tailored to the knowledge level of the group of participants. Ahead of the Capture the Flag workshop, we set up an online CTF portal with an extensive set of challenges with themes such as binary, networking, infrastructure and web. The challenges range from very easy to highly complex and match the knowledge and backgrounds of the participants, the development team as a whole and the organisation they work for as closely as possible.

The event begins with an explanation of the rules, the online portal, and the dividing up of the teams. These teams work together to solve the challenges and learn from each others’ expertise. The teams do battle to see who will pick up the most points. Naturally, you can keep track of the results live on the scoreboard. A Computest security consultant supervises the CTF and helps the participants with hints and explanations. At the end of the CTF, the winning team is honoured and the day concludes in festive style.

Training by our hackers

The most important thing that sets our courses apart is that they are taught by our own ethical hackers with programming knowledge. Our trainers are first and foremost passionate hackers who apply their skills to complex security projects on a daily basis. And who better to train a developer than a hacker?

Thanks to the enthusiasm with which they communicate their knowledge and vividly illustrate it with examples and practical situations, they are valued as trainers and guest speakers. Our trainers work at and are educated to higher vocational level/university level and are selected for their good communication and social skills.

Our vision of learning

We strongly believe in ‘learning by doing’. A theoretical framework is important for placing security testing within the security domain. But in order to really make the world of hacking tangible and increase security awareness, it is important to get the participants involved in practical assignments. At Computest, about 75% of the course consists of hands-on training.

With the help of interactive sessions and a range of challenges, participants learn to hack, draw up security plans and/or carry out tests. Our trainers supervise them intensively during the assignments and answer questions so that they can work independently in practice.

Assuring quality

Daan Keuper is responsible for the overall quality of our training. He is a top hacker; he has finished third in global hacking competitions three times and made the news by finding vulnerabilities in the iPhone and in a passenger vehicle. He also has over 10 years of experience in delivering security and other training courses for technical and non-technical participants.

Daan develops the customised courses, provides the teaching materials and constantly keeps them up to date. He delivers courses himself and is also responsible for selecting, training and supervising other trainers. Daan regularly sits in on courses to monitor their quality and the professionalism of the trainers and to provide guidance where necessary. We also ask our participants for feedback after each course by means of an anonymous tool. This feedback is discussed by Daan and the trainers in order to further improve our courses.

Price, dates and location

The course costs €5.900 (in-company) for a maximum of 12 participants per workshop.

We provide a pleasant and relaxed learning environment. The courses are held at the Computest office. We have a beautiful space available for this purpose with a roof terrace, and we also serve a delicious lunch. In-company training can also be delivered at the customer location.


Tailor-made courses are always an option, for large or small groups. Thanks to the broad knowledge we have in-house, we can provide courses for all kinds of target groups and to a very high technical standard.

A CTF workshop is often be successfully used as an educational teambuilding day!

Courses can also be focused on a particular topic, for example mobile apps. As such, you will always be able to find an appropriate course or have one tailored to your needs. Please contact us to discuss the options.

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