Mitsubishi PLC super encryption detailed process and protocol - Database & Sql Blog Articles

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Super encryption is a technique that doesn't rely on software to secure the program of a Mitsubishi PLC. Instead, it involves writing specific values to illegal registers, making it impossible to read the program directly. This method has been tested extensively on the Mitsubishi FX1S PLC, and successful encryption is achievable. The process includes detailed steps and protocol analysis, which can help in understanding how the encryption works. While reverse decryption might be possible, it's not an easy task. Everyone is encouraged to share their thoughts and opinions without mocking or belittling others. I hope that experts will review this information and correct any mistakes if necessary. It's important to note that the FX1N and 2N series use different protocols, so the same approach may not apply directly. However, sharing such insights helps everyone learn and grow together.

It's also worth mentioning that while some people might criticize or dismiss this information, it's crucial to foster a supportive environment where constructive feedback is welcomed. People who just throw criticism or "throw bricks" should instead offer positive support. If you're reading this post, it shows you're open to learning and exploring new ideas. This kind of content requires careful study and deep thinking. Let's encourage discussions around topics like the 3U and 3G series, and avoid spreading misinformation or engaging in unproductive debates. Understanding these processes takes time, patience, and a willingness to engage with technical details.

The encryption process for the Mitsubishi FX1S PLC involves several key steps through serial communication. Here's a breakdown of the sequence:

• First Serial Port Initialization:
  • [00000000] IOCTL_SERIAL_SET_BAUD_RATE: Baud Rate set to 9600
  • [00000000] IOCTL_SERIAL_SET_LINE_CONTROL: StopBits = 1, Parity = Even, DataBits = 7
  • [00000001] IRP_MJ_WRITE: STX (02H) – Start of transmission
  • [00000001] IRP_MJ_WRITE: CMD instruction 37H followed by address '250F'
  • [00000001] IRP_MJ_WRITE: ETX (03H) – End of transmission
  • [00000001] IRP_MJ_WRITE: Checksum (31 37) – Sum of previous bytes
• Second Write Operation:
  • [00000008] IRP_MJ_WRITE: STX (02H)
  • [00000008] IRP_MJ_WRITE: CMD instruction 37H with address '250F'
  • [00000008] IRP_MJ_WRITE: ETX (03H)
  • [00000008] IRP_MJ_WRITE: Checksum (31 37)
• Writing Data:
  • [00000015] IRP_MJ_WRITE: STX (02H)
  • [00000015] IRP_MJ_WRITE: CMD function code 31H (Write data), address '8000', 2 operands (double word), value '0'
  • [00000015] IRP_MJ_WRITE: ETX (03H)
  • [00000016] IRP_MJ_WRITE: Checksum (31 45)
• Repeat Writing Process:
  • [00000022] IRP_MJ_WRITE: Same as above with data '0'
  • [00000023] IRP_MJ_WRITE: ETX (03H) and checksum (31 45)
• Close Port and Reopen:
  • [00000030] IRP_MJ_CLOSE: Port closed
  • Reopen port with same settings
• Reset Command:
  • [00000000] IOCTL_SERIAL_SET_BAUD_RATE: 9600
  • [00000000] IOCTL_SERIAL_SET_LINE_CONTROL: Same as before
  • [00000000] IRP_MJ_WRITE: STX (02H)
  • [00000000] IRP_MJ_WRITE: CMD 38H with address '250F'
  • [00000001] IRP_MJ_WRITE: ETX (03H) and checksum (31 38)
• Final Steps:
  • [00000010] IRP_MJ_CLOSE: Port closed again

This process demonstrates how the encryption is implemented at the register level, bypassing traditional software-based encryption methods. Understanding this gives insight into how the system communicates and secures its internal data. For those interested in further exploration, analyzing similar protocols in other models could lead to deeper understanding and innovation.