Cloud computing provides a convenient way of content trading and sharing.In this paper,we propose a secure and privacy-preserving digital rights management(DRM)scheme using homomorphic encryption in cloud computing.We present an efficient digital rights management framework in cloud computing,which allows content provider to outsource encrypted contents to centralized content server and allows user to consume contents with the license issued by license server.Further,we provide a secure content key distribution scheme based on additive homomorphic probabilistic public key encryption and proxy re-encryption.The provided scheme prevents malicious employees of license server from issuing the license to unauthorized user.In addition,we achieve privacy preserving by allowing users to stay anonymous towards the key server and service provider.The analysis and comparison results indicate that the proposed scheme has high efficiency and security.
The online social networks(OSNs) offer attractive means for social interactions and data sharing, as well as raise a number of security and privacy issues. Although current solutions propose to encrypt data before sharing, the access control of encrypted data has become a challenging task. Moreover, multiple owners may enforce different access policy to the same data because of their different privacy concerns. A digital rights management(DRM) scheme is proposed for encrypted data in OSNs. In order to protect users' sensitive data, the scheme allows users outsource encrypted data to the OSNs service provider for sharing and customize the access policy of their data based on ciphertext-policy attribute-based encryption. Furthermore, the scheme presents a multiparty access control model based on identity-based broadcast encryption and ciphertext-policy attribute-based proxy re-encryption, which enables multiple owners, such as tagged users who appear in a single data, customize the access policy collaboratively, and also allows the disseminators update the access policy if their attributes satisfy the existing access policy. Security analysis and comparison indicate that the proposed scheme is secure and efficient.
In order to solve the contradictions between user privacy protection and identity authentication, an anonymous authentication scheme under mobile Internet is proposed, which is based on the direct anonymous attestation of trusted computing and uses the encrypting transfer and signature validation for its implementation. Aiming at two access mode of trusted mobile terminal under mobile Internet, self access and cross-domain access, the authentication process of each mode is described in details. The analysis shows that the scheme implements anonymous authentication on mobile Internet and is correct, controllable and unforgeable.
＜正＞In this paper we establish a general social intelligent algorithmic framework for packing problem under the...
Junling Wang~(*++),Yi Yang~+,Chenyang Zhao~*,Li Liu~+,Caihong Li~*,Lian Li~+,Jiazao Lin~? * School of Mathematics and Statistics Lanzhou University,P.R.China,730000 + School of Information Science & Engineering Lanzhou University,P.R.China,730000§School of Computer Science University of Guelph,Guelph,Canada,N1G 2W1
