Fumiharu Etoh

Study of Log File Dispersion Management Method

In system equipment, a mechanism to prevent the manipulation or deletion of log information and log files by an attacker and to maintain the contents of log files are essential. Because log files include an active event and an operation event in the system equipment, these files are at risk of attacks such as file manipulation or deletion. In this paper, we propose a log file dispersion management method using hash values. It is possible to detect the manipulation or deletion of log information and log files and to reconstruct original log files. Further, this method has both redundancy and resistibility.

A Study of Communication Route Selection Considering Route Security

Networks such as the Internet and mobile phone networks are widely used. Existing telecommunication route selection is based on the transmission quality, such as bandwidth, delay, costs, and network obstacles when routing is requested. However, the security level of the selected route has not traditionally been a priority when selecting a route. In this paper, we propose a method of selecting a communication route for secure communications by evaluating the security of the route. For the security evaluation of the route, we define both metrics and measurements. It is possible to evaluate the security level of a route by recognizing how the level changes after measuring certain metrics. Furthermore, we propose metrics and measurement based on the Common Criteria.