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Rami Ahmed

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Open access Aug 2026

Stateless Geometric Watermarking for Replay-Resistant QR-Based Attendance Verification

QR codes are used in many educational institutions for attendance tracking. This is due to their low cost, rapid deployment, and compatibility with mobile devices. However, a drawback of using QR codes is their ease of resending. A student can take a picture of the code and send it to a friend, who can then use it with...

Rami Ahmed · 0 citations

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