Kazuto Fukushima

Information-theoretic approach to authentication codes for power system communications

The purpose of this study is to realize a practical method of providing cyber security for power system communications. Considering communication requirements needed for Smart Grids, power system communications can be classified into five main categories: real-time protection, supervisory control and data acquisition (SCADA), remote access, demand management system (DMS) and advanced metering infrastructure (AMI) . This paper describes a concept and method of effectively applying information-theoretic cryptography to these power system communications. From the requirements of real-time communication and long-term maintenance of such systems, we explore a novel scheme based on unconditionally secure authentication codes (A-codes) having short authenticators (authentication tags) and a feasible number of keys, and have developed a data format for the scheme. The efficiency of the scheme is illustrated using several examples and experimental results.

Protection relay systems employing unconditionally secure authentication codes

The purpose of this study is to produce practical cyber security for protection relay systems using communication channels, such as pilot protection schemes or wide area protection systems. This paper describes a concept and method of effectively applying unconditionally secure authentication codes (A-codes) to such protection relay systems. From the requirements of real-time communication and long-term maintenance of protection relays, we propose a novel scheme based on A-codes having short authenticators (authentication tags) and a feasible number of keys. The efficiency of the scheme is shown by several examples of pilot protection systems and wide area protection systems. The performance and the key management of the proposed algorithm are also discussed.

Power system communications and information-theoretic cryptography

The purpose of this study is to realize a practical method of providing cyber security for power system communications. Power system communications can be classified into three main categories: real-time protection, supervisory control and data acquisition (SCADA), and remote access. This paper describes a concept and method of effectively applying information-theoretic cryptography to real-time protection and control systems, such as pilot protection schemes, wide area protection systems etc. From the requirements of real-time communication and long-term maintenance of such systems, we propose a novel scheme based on unconditionally secure authentication codes (A-codes) having short authenticators (authentication tags) and a feasible number of keys. The efficiency of the scheme is illustrated using several examples of protection and control systems.