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传统的公平合同签署协议通过引入中心化的可信第三方来保证协议的公平性。当第三方不诚实且和签署一方进行合谋,就会对另一方产生不公平。同时,第三方可能会泄露参与方的敏感信息,这将极大地威胁参与方的隐私。故合同签署的公平性和隐私性均依赖于第三方的可靠性。基于区块链的公平合同签署协议可去中心化从而避免依赖第三方来解决公平性,但区块链可被公开访问和验证,这为参与方的隐私问题又带来新的挑战。已有的基于公开区块链的隐私保护公平合同签署协议利用参与方共享的秘密因子对合同信息及公钥进行加密从而隐藏了参与方数字证书中的真实身份信息;但在协议的承诺阶段,由于区块链的假名性,执行两笔保证金交易时可能会泄露正在签署合同的参与方信息。为最大限度保护参与方的身份隐私,本文基于混币技术,通过引入半诚实可信第三方来提供参与者身份的混淆服务,并结合盲的可验证加密签名方案,设计出新的隐私保护公平合同签署协议。该协议可支持多个合同签署人通过区块链完成公平的合同签署,不仅可以保护与合同相关的隐私内容,还可以保护参与方的身份隐私。 相似文献
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Ambidi Naveena Katta Rama Linga Reddy 《Information Security Journal: A Global Perspective》2018,27(2):92-101
Mobile ad-hoc network (MANET) has got tremendous success and attention due to its self-maintenance and self-configuration properties or behavior. Based on wired and wireless networks, the network topology of MANETs changes rapidly by means of routing attacks. Hence, providing security to this infrastructure-less network is a major issue. The routing protocols for ad-hoc networks cope well with the dynamically changing topology but are not designed to accommodate defense against malicious attacker. Malicious nodes have opportunities to modify or discard routing information or advertise fake routes to attract user data to go through themselves. In this article, we discuss a hybrid technique using anonymity, one-way trapdoor protocol, hash functions, and elliptic curve cryptographic to mitigate attacks in the MANET. The simulation is carried on NS-2 and the simulation results are dissected on different system execution measurements, for example, packet send and received, packet dropped, average network throughput, end-to-end delay, and packet delivery ratio. 相似文献
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