$ cat writeup.md…
$ cat writeup.md…
CACTF2026
Task: An 8 MiB ESP32-S3 flash dump hides a relay key behind a decoy Wi-Fi credential and an address-derived stream. Solution: Rebuild the active app as Xtensa ELF, recover its LCG decryptor, and brute-force the bounded 24-bit seed.
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