P2P环境下的具有隐私保护的信誉协议

发布时间：2018-06-14 00:35

本文选题：ElGamal密码系统 + Cramer-Shoup密码系统　；参考：《计算机科学》2013年S1期

【摘要】：信誉协议通过计算系统用户的信誉评价结果的总合得到最后的信誉结果,然后根据该信誉结果做出相应的决策。在现实情况中信誉系统中的用户往往会反馈一个不诚实的信誉值,因为他们担心他们真实的评价结果会遭到对手的报复。提出一个具有隐私保护的信誉协议,该协议能保证某实体得到其他实体诚实公平的信誉评价。在该协议中使用Shamir门限密钥共享为参与者提供共享子密钥,并利用具有同态性质的可验证密钥共享使得交易员和密钥持有者之间能够验证共享子密钥的正确性。协议中持有共享子密钥的参与者是随机选择的。运用语义安全的ElGa-mal密码系统和Cramer Shoup密码系统,共享密钥的持有者可以以隐私保护的方法提交他们的信誉值,并由一个可信的代理计算信誉结果提交给信誉引擎。用户可通过访问信誉引擎获得信誉结果。该协议保证了信誉结果计算过程中的隐私保护性和信誉结果的可靠性。
[Abstract]:The reputation agreement obtains the final credit result by calculating the aggregate of the credit evaluation result of the system user, and then makes the corresponding decision according to the credit result. In reality, users in reputation systems often feedback a dishonest credit rating because they fear that their true evaluation results will be retaliated by their opponents. A reputation protocol with privacy protection is proposed, which can guarantee an entity to receive honest and fair reputation evaluation from other entities. In this protocol, Shamir threshold key sharing is used to provide shared subkeys for participants, and homomorphic verifiable key sharing enables traders and key holders to verify the correctness of shared sub-keys. Participants holding shared subkeys in the protocol are randomly selected. Using the semantic secure ElGa-mal cryptosystem and Cramer Shoup cryptosystem, the holders of shared keys can submit their reputation values in a privacy manner, and the creditworthiness results can be submitted to the reputation engine by a trusted proxy. Users can access the reputation engine to obtain reputation results. This protocol ensures privacy protection and reliability of reputation results.
【作者单位】：国家计算机网络应急技术处理协调中心;四川大学信息管理中心;
【基金】：四川省科技支撑计划项目(2012GZ0001) 上海市科学技术委员会基金项目(11511505300)资助
【分类号】：TP393.08

【相似文献】