A wearable ECG heart-rate pendant. AD8232 front-end → on-device DSP (HR / HRV / PR-QRS-QT-QTc / mood) → screen + LAN web dashboard. Runs on an M5Stack Cardputer ADV (ESP32-S3, no PSRAM). 1000 Hz ...
A curated, searchable index of hands-on CTF labs covering classical/modern cryptography, XOR ciphers, hashing, OAuth flows, session hardening, MFA implementation, broken authentication, and access ...
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