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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.