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Rolling AES Without the Black Box: Cryptographic Primitives and Key Hygiene

A look into symmetric encryption in Python: why AES-CBC will bite you if you mishandle padding, moving to authenticated AES-GCM, and building lightweight utilities that run anywhere.

Scale at the Door: Designing Fraud-Resistant QR Attendance Loops

What happens when 500 students scan into a lecture hall in under two minutes? Mitigating screenshot spoofing with rotating seeds, indexed schema constraints, and sub-second validation.

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Rolling AES Without the Black Box: Cryptographic Primitives and Key Hygiene

Scale at the Door: Designing Fraud-Resistant QR Attendance Loops

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