无证书的共享数据公开审计方案

公钥密码体制中多数公开审计方案存在证书管理问题,会增加存储负荷和通信成本。为有效验证半可信云中数据的完整性,减少证书管理的额外开销,提出一种无证书的公开审计方案。采用同态技术实现批审计,高效完成多个用户的审计需求,通过ELGamal加密体制对用户身份进行追踪,防止用户的恶意行为。安全性和性能分析结果表明,该方案安全高效,能够抵抗类型Ⅰ和类型Ⅱ敌手攻击,并满足签名不可伪造性和签名用户身份隐私性。

Certificateless Public Audit Scheme for Shared Data

Many public audit schemes in public key cryptosystem have certificate management problem,which will increase storage load and communication cost.In order to effectively verify the integrity of the data in the semi-trusted cloud and reduce the extra cost of certificate management,this paper proposes a certificateless public audit scheme.The batch audit is realized by using homomorphic technology,so as to efficiently complete the audit needs of multiple users.The ELGamal encryption system is adopted to track user identity,thus preventing the malicious behavior of users.The results of security and performance analysis show that the proposed scheme is safe and efficient.It can resist typeⅠand typeⅡadversary attacks and satisfy the unforgeability of signature and the privacy of user identity.