The Siemens S7 200 PLC has a built-in password protection mechanism to prevent unauthorized access to the device. The password is used to protect the PLC's programming, configuration, and data. When a password is set, the PLC will prompt the user to enter the password before allowing access to the device.
Siemens patched this in later firmware (CPU 22x series with firmware 1.0.2 and above). On patched units, the hash is not transmitted, or it is salted. Siemens S7 200 Password Crack
For most plants, that downtime is unacceptable, hence the underground market for cracking tools. The Siemens S7 200 PLC has a built-in
: Plugging in an unprotected memory submodule and cycling power will overwrite the password-protected internal program with the new one. Advanced Password Bypass (Research & Third-Party) the hash is not transmitted