| With the gradual transformation of smart grids,incentive demand response is becoming increasingly popular as an important measure for regulating peaks and troughs.Auction-based incentive demand response in colocation data center not only increases interest and incentives for user participation,but also minimizes grid costs and maximizes benefits.However,there is a lack of trusted third parties in the auction process,which can lead to the users’ privacy disclosure.It is important to research privacy protection scheme in colocation data center.In addition,combining incentive demand response with blockchain is a major trend.Incentive demand response that is not based on auction mechanism has many transaction information in the transaction process,which is sensitive and can even have a range of security issues,such as tampering with transaction information and inflexible trading methods.However,there is still work to be done on privacy protection scheme applied to colocation data center emergency demand response auction and the blockchain-based incentive demand response transaction mechanism,for which several schemes are proposed in this paper.The specific work is as follows.(1)To address the problem that malicious attacks on users’ real identities,user bids,user power values and other information under the em ergency demand response auction mechanism in colocation data center can easily cause user privacy leakage,a user privacy protection scheme in emergency demand response auction based on clock auction and ring signature encryption is proposed.A clock auction method is designed to solve the problem of long auction times by reducing the price and motivating users to respond quickly.And a certificateless ring signature encryption technique is used to encrypt user information,protecting the user’s privacy with low computational overhead and unconditional anonymity.The scheme not only ensures the privacy of users,but also has the characteristics of confidentiality and unforgeability.Experiments show that the scheme has lower computational overhead and auction execution time.(2)To Addresse problems such as high computational overhead in the user authentication phase,an incentive demand response model for user anonymous mutual authentication based on permissioned blockchain and certificate-free signature is designed.This anonymous mutual authentication scheme is capable of identifying malicious users and has high security,providing the basis for the transaction mechanism designed below.(3)A permission-based blockchain transaction mechanism is designed to address the problems of non-transparent transaction and low user credibility of existing incentive demand response transaction mechanism.An anonymous mutual authentication scheme is designed to solve the trust problem between the user and the demand response provider;the credit value reward and punishment mechanism is used to reduce the risk of user default;the blockchain is used to store user transaction data,which solves the problem of centralized storage of user data.Security analysis proves that the scheme is resistant to many malicious attacks such as replay attack.Based on optimized transaction process,the scheme not only protects user privacy and transaction transparency,but also has low communication overhead.(4)The performance of the above scheme is analysed and compared with the compared schemes in terms of computational overhead and functionality.The results show that the scheme designed in this paper can solve the problems of high communication overhead and high computational overhead,and has high transaction efficiency. |
