CTFPJL execution on a printer CTFNoisy channel. Hamming codes CTFHTB CA 2023. Noisy channel. Hamming codes CTFIntel HEX. Firmware reversing CTFFile system extraction. Pattern search CTFAutomotive Cybersecurity. CAN bus messages CTFVHDL. XOR. ASCII characters CTFRadiofrequency analysis CTFNetwork traffic analysis. Modbus TCP