How one more question about proxy attendance pushed me to add another layer of trust to my attendance system. The QR Code Was Already Dynamic When I started building my anti-proxy attendance system, I knew a normal QR code wasn't enough. If a tea...

How an unexpected database limit led me to build an offline-first anti-proxy attendance system. Introduction When I started building an attendance system for my university's UBA Unnat Bharat Abhiyan club, I had one clear instruction from our coordi...

"Anyone can generate a QR code. Designing one that actually prevents misuse is the hard part." When people hear "QR-based attendance," the first question is usually: "Can't someone just take a photo of the QR code and send it to their friend?" The...

Traditional attendance systems seem simple until you look at how they work in practice. Manual roll calls consume valuable class time, paper attendance sheets are inefficient, and many QR-based systems can still be exploited through proxy attendance....