철도 보안인증시스템의 멀티캐스트 통신을 위한 그룹 보안 정책 관리 방안 연구

초록

For the safe and efficient railway operation, vital information of railway systems such as trains, rail infrastructures, and signalling system is sharing via the railway communication network. To protect this information, a railway security system has been proposed. In this paper, we propose a group policy manager(GPM) that manages the security policy to secure confidentiality for multicast group communication. It can update and distribute the security policy and group encryption key when joining and leaving multicast group members. The GPM notifies the changed group security policy to the key management server(KMS) and railway security device(RSD), and RSD updates a new group encryption key according to the group policy change to maintain communication security. GPM enables real-time management of multicast group security policies without changing the existing KMS.

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