Sensor Watch

reverse exotic FCSC 2023 solved on

star

Description

You notice that one of your colleagues is playing with his CASIO F-91W watch before entering the password for his computer. After questioning him about it, he hands you his watch and a USB key containing a single `emulator’ folder and challenges you to find his password.

You take the watch apart and… surprise! the PCB does not seem to be original… You copy the contents of the flash into the watch.uf2 file.

You play a little with the emulator and you find an interface that asks you for a PIN code… You try the birthdate of your colleague, but the watch displays BADPIN.

Files

  • watch.uf2
    180.00 KiB – f30e57fd42111d244b86387832694cbc242da5820cfd0a66bb9806642eda28ea
  • emulator.tar.xz
    198.43 KiB – 57f3a64aaa3b1e1803c0fee91e9ec4843d0761bb0b13007cf7852fe3032de269

Author

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