Ubiquitous computing systems typically have lots of security problems in the area of identity authentication by means of classical PKI methods. The limited computing resources, the disconnection network, the classific...Ubiquitous computing systems typically have lots of security problems in the area of identity authentication by means of classical PKI methods. The limited computing resources, the disconnection network, the classification requirements of identity authentication, the requirement of trust transfer and cross identity authentication, the bi-directional identity authentication, the security delegation and the simple privacy protection etc are all these unsolved problems. In this paper, a new novel ubiquitous computing identity authentication mechanism, named UCIAMdess, is presented. It is based on D-S Evidence Theory and extended SPKI/SDSI. D-S Evidence Theory is used in UCIAMdess to compute the trust value from the ubiquitous computing environment to the principal or between the different ubiquitous computing environments. SPKI-based authorization is expanded by adding the trust certificate in UCIAMdess to solve above problems in the ubiquitous computing environments. The identity authentication mechanism and the algorithm of certificate reduction are given in the paper to solve the multi-levels trust-correlative identity authentication problems. The performance analyses show that UCIAMdess is a suitable security mechanism in solving the complex ubiquitous computing problems.展开更多
针对当前微电网(microgrid,MG)群交易模型存在的安全性低、交易效率不高和经济效益不平衡的问题,构建基于区块链的MG群电力交易模型。在数据层采用国家自主研发的非对称加密算法SM2和哈希算法SM3,对交易的参与者进行身份认证,并通过净...针对当前微电网(microgrid,MG)群交易模型存在的安全性低、交易效率不高和经济效益不平衡的问题,构建基于区块链的MG群电力交易模型。在数据层采用国家自主研发的非对称加密算法SM2和哈希算法SM3,对交易的参与者进行身份认证,并通过净负荷值确定买卖双方角色;在共识层采用基于信用值的权益授权证明(delegated proof of stake,DPOS)共识机制,以防止交易参与者作弊恶意攻击;在激励层设计基于信用值激励的价格调整和合同匹配机制,鼓励各参与者积极参加交易,提高交易效率;在合约层采用基于粒子群的多目标优化融入智能合约,执行MG群最优购电方案的选取,最大化买卖双方利益。基于Python仿真环境对所提方法进行实验论证,结果表明,所提方法的激励机制和共识机制有效,共识最长耗时仅为1.11 ms。所提方法虽然增加了部分交易延时,但获得了更高的安全性和经济效益。展开更多
基金Supported by the Ministry of Educationin China (No.104086)
文摘Ubiquitous computing systems typically have lots of security problems in the area of identity authentication by means of classical PKI methods. The limited computing resources, the disconnection network, the classification requirements of identity authentication, the requirement of trust transfer and cross identity authentication, the bi-directional identity authentication, the security delegation and the simple privacy protection etc are all these unsolved problems. In this paper, a new novel ubiquitous computing identity authentication mechanism, named UCIAMdess, is presented. It is based on D-S Evidence Theory and extended SPKI/SDSI. D-S Evidence Theory is used in UCIAMdess to compute the trust value from the ubiquitous computing environment to the principal or between the different ubiquitous computing environments. SPKI-based authorization is expanded by adding the trust certificate in UCIAMdess to solve above problems in the ubiquitous computing environments. The identity authentication mechanism and the algorithm of certificate reduction are given in the paper to solve the multi-levels trust-correlative identity authentication problems. The performance analyses show that UCIAMdess is a suitable security mechanism in solving the complex ubiquitous computing problems.
文摘针对当前微电网(microgrid,MG)群交易模型存在的安全性低、交易效率不高和经济效益不平衡的问题,构建基于区块链的MG群电力交易模型。在数据层采用国家自主研发的非对称加密算法SM2和哈希算法SM3,对交易的参与者进行身份认证,并通过净负荷值确定买卖双方角色;在共识层采用基于信用值的权益授权证明(delegated proof of stake,DPOS)共识机制,以防止交易参与者作弊恶意攻击;在激励层设计基于信用值激励的价格调整和合同匹配机制,鼓励各参与者积极参加交易,提高交易效率;在合约层采用基于粒子群的多目标优化融入智能合约,执行MG群最优购电方案的选取,最大化买卖双方利益。基于Python仿真环境对所提方法进行实验论证,结果表明,所提方法的激励机制和共识机制有效,共识最长耗时仅为1.11 ms。所提方法虽然增加了部分交易延时,但获得了更高的安全性和经济效益。
