Taghardware
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Vibecoding an ESP32 Door Monitor
A hands-on write-up of building "Tripwire," my ESP32 door monitor that pairs a magnetic reed switch with a clever Bluetooth SPP trick to tell whether it was me or a stranger who opened the door, sending alerts via ntfy.sh.
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Magstripe tinkering
My hobbyist dive into magnetic stripe card technology: how magstripes encode data, and how I hacked a Square reader by bypassing its encryption chip to read raw card data, with some reflections on real-world magstripe security.
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Survey of Cryptographic Implementations and Vulnerabilities on Passive RFID Devices
A 20-page survey paper (UCSB) on the cryptography of passive RFID tags — system and adversary models, the attack landscape, the famous Mifare and DST breaks, and mitigation strategies — rebuilt from the original LaTeX, led in by the post's own plain-English "quick version."
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Physical Unclonable Functions
A grad-class intro to PUFs — hardware functions whose challenge-response mapping falls out of physical manufacturing variation — covering their key principles, types, properties, and the intra-/inter-distance math used to measure them.
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