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SalScotto/writeup-sqUARe-paymenT-terminal.md

Created November 28, 2022 19:03
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Writeup "sqUARe-paymenT-terminal" - SquareCTF 22
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writeup-sqUARe-paymenT-terminal.md

Logic2 file (recognized by the UART in the name of the challenge and the .sal extension)

By opening it, we can see that most of the channels are unused, there's transmission only on channel 0.

Since we already know that is a UART communication, we can use Logic's Async Serial tool to read the content

We can try the most common Baud Rates to try and decode the serial content (9600, 14400, 19200, 38400, 57600, 115200)

Settings used

With 38400 bps we can read the flag

flag

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