Practical Preserving Identity-Privacy Anonymous Data Sharing in Cloud Computing

Cloud computing provides a very good platform in which a large number of participants can conveniently access and use the stored data in order to realize data sharing. However, in some cases, there exists a conflict of interest or each other´s influences between participants. Thus, the identities of participants need to be hidden. The existing anonymous data sharing schemes can neither achieve identity´s full privacy due to adopting group signature or ring signature, nor realize data sharing under the different crypto-systems. To address this problems, we first propose an anonymous receiver encryption in the hybrid crypto-system in this paper, then put forward an anonymous data sharing scheme based the proposed anonymous receiver encryption. And the scheme is proven to be secure against confidentiality attack and the receiver´s anonymity attack in the random oracle model. Our anonymous data sharing scheme has the following advantages:(1) data confidentiality, (2) the full anonymity of the sharer´s identity, (3)Supporting data updating without the share´s identity information, (4)supporting data sharing of the sharers under different crypto-systems.