ICS Software Trust Measurement Method Based on Dynamic Length Trust Chain

Table 3

Algorithm validation results.

Test case	Use integrity measurement	Do not use integrity measurement
Use correct start_openplc.sh file	Successful	Successful
Modify one of the security-sensitive files	Unsuccessful	Successful
Modify the file bool_true.png that does not affect the application	Successful	Successful
Update libmodbus.o with security measures	Successful	Successful
Infect files with a virus bootkit [39–41]	Unsuccessful	Successful