Evaluation of Processing Time in Trial-and-Error Function of Security Exercise System for Security Beginners

Cyber defense exercises are effective as a method of training security personnel against the sophisticated cyber attacks. In this exercise, the problem is how to practice for beginners who do not know how to execute defense methods according to attacks. To solve this problem, it is important to be able to trial-and-error the defense method many times during the exercise. Therefore, we develop a defense training system with a trial-and-error function by using the virtual machine snapshot function. It is desirable that the processing time of the trial-and-error function during the exercise be short, but generally the processing time increases as the number of participants increases. In this paper, we measure the processing time of trial-and-error function. Then, we estimate the number of students accommodated on one host machine.