https://thedveloper.com/blog My Digital Garden with my thoughts, tutorials or experiences en-us christian+site@thedveloper.com (Christian Guevara) christian+site@thedveloper.com (Christian Guevara) Thu, 08 Oct 2026 00:00:00 GMT https://thedveloper.com/blog/eufy-t8400-sdcard-decryption https://thedveloper.com/blog/eufy-t8400-sdcard-decryption A sequel to my .zxvideo post. This time the keyframes were AES encrypted with a weekly-rotating key. The story of every dead end - the live key, the P2P stream, the ECC path, a screenful of green - and how hooking a random-number generator inside the app's native library with angr finally recovered the keys to decrypt 23 days of my own recordings. Thu, 08 Oct 2026 00:00:00 GMT christian+site@thedveloper.com (Christian Guevara) reverse engineeringpythonangrffmpegsecurity camerascryptography