A partially blind signature allows a signer to explicitly embed a pre-agreed common information into a blind signature without the loss of blindness property. It is an important technology in e-commerce. In ID-based public key setting, a user's public key can be derived directly from his identity without access to public key certificate. It can simplify the key management process in traditional certificate based cryptosystem. To our knowledge, many partially blind signature schemes have been proposed till now. However, no ID-based partially blind signature scheme has been proposed. Recently, Chow et al. first proposed an ID-based partially blind signature scheme based on bilinear pairings, but it isn't very efficient. In this paper, we improve C how et al's scheme and present a new ID-based partially blind signature scheme. We also analyze the security and efficiency of the proposed scheme. We show that our scheme is more efficient and needs less computation cost than Chow et al.'s scheme and is provably secure under the random oracle model.
Power systems get more unstable and insecure with more transmission congestion and smaller generation reserves. There is prospect of wide area control schemes meeting the challenge instead of traditional local ones. Communication network technologies, which have made a great stride during last decade, will play an important role in the new schemes. Control systems based on Wide Area Networks (WAN) are studied in this paper. Multi-agent concept is introduced to improve the control performance. A novel wide-area control system that utilizes Phasor Measurement Unit (PMU), wide-area communication and multi-agent technology is presented. The distributed system architecture and multi-agent working mechanism are discussed in order to use phasor data and to realize optimal power system stability control.
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