0xdeadbeef: Sharing My Passion for Cybersecurity

At Hwa Chong, Sabbatical Week also provides opportunities for students to take ownership of learning by designing and leading programmes for their peers. In this reflection, Yuzhong shares how organising the cybersecurity sabbatical “0xdeadbeef” deepened his technical knowledge, challenged him as a trainer, and allowed him to give back to the school community through a subject he is passionate about.

Written by: Fu Yuzhong (4A3, 2026)

From 18 to 22 May, I was given the opportunity to organise a sabbatical titled “0xdeadbeef”, a programme centred on cybersecurity and the importance of staying safe as we advance further into the age of technology. The title “0xdeadbeef” is a playful reference familiar to those in computing, often used as a recognisable placeholder value in programming and debugging. It was a fitting name for a sabbatical that introduced students to the world of cybersecurity. This experience yielded many valuable takeaways, both for myself and my team.

Firstly, it allowed me to deepen my understanding of cybersecurity. As a student with a prior interest in the field, I had a foundational grasp of cybersecurity and was particularly proficient in web exploitation, the process of identifying vulnerabilities in websites that require remediation. Despite this background, I was still relatively unfamiliar with several other areas, such as cryptography, which involves analysing encryption algorithms and identifying flaws in their implementation.

During the sabbatical, we provided a holistic overview of these different sectors. As a trainer, it was my responsibility to study these areas in advance to ensure that I could adequately support participants. In the weeks leading up to the programme, I consulted fellow trainers, each with their own areas of expertise, and made a concerted effort to broaden both the depth and breadth of my knowledge. This process ultimately rekindled my passion for the field.

Secondly, the experience offered me valuable insight into the teaching process. Cybersecurity is not an easy subject to learn, and this challenge is amplified within a timeframe as short as five days, given the abstract nature of many of its concepts. To address this, I simplified and broke down complex ideas, used analogies to bridge the gap between theory and intuition, and exercised patience when participants needed certain topics to be revisited. This was a new experience for many of the trainers, and it pushed all of us to adapt and adopt clearer, more accessible teaching methods.

Lastly, planning presented its own set of challenges. The sabbatical comprised two distinct components: theoretical instruction and practical application. Given that hands-on experience is as important as, if not more crucial than, theoretical knowledge in cybersecurity, we organised a Capture The Flag (CTF) competition for the final day. In a CTF contest, participants work through a variety of cybersecurity challenges to uncover hidden content using techniques acquired throughout the programme.

Our trainers therefore had to dedicate time not only to preparing their teaching slides, but also to designing custom challenges tailored to the skills taught in the preceding sessions. This was no small undertaking, particularly given the demands of a busy Term 2.

We also encountered an unexpected logistical hurdle. We had planned to award mousepads to the top three finalists and distribute sweets to encourage active participation during the regular teaching sessions. Unfortunately, the sweets did not arrive until the third day, and the mousepads were not delivered until after the sabbatical had concluded. To ensure that the final-day competition still had meaningful prizes, I personally purchased and wrapped several replacement gifts beforehand, a small but important step in preserving the spirit of the event.

In conclusion, organising this sabbatical was both enjoyable and deeply instructive. The unique nature of the programme and the challenges we navigated along the way offered many lessons, chief among them a stronger sense of personal agency and a renewed enthusiasm for cybersecurity. Above all, it was genuinely meaningful to give back to the school community by sharing something I care deeply about, and I am sincerely grateful for the trust placed in me and my team to make this experience a worthwhile one for every participant.