Write-up of the Spacial TOTP challenge of Insomni'hack CTF 2023. Official description I sealed my master phassphrase on this device and protected it using my own TOTP algorithm. Can you recover it ?
Once ready, come to the organizers desk to validate your solution on the device. (No connection to the device allowed)
We are given a challenge.elf file.
Exploration The challenge.elf file First, let’s confirm it is an ELF file:
$ file challenge.elf challenge.elf: ELF 32-bit LSB executable, Tensilica Xtensa, version 1 (SYSV), statically linked, with debug_info, not stripped We note that it is not stripped and includes debug information....