Earticle

Content abusing is increasingly common with the rapid development of the Internet, which damages the benefits of copyright owners, how to effectively prevent the abuse of digital contents is a big challenge. In this paper, we propose a secure DRM scheme supporting dynamic authorization, which first encrypts content with content encryption key (CEK), and then protects CEK based on distributed attribute-based encryption. At last encrypted CEK will be packaged and distributed with encrypted content, which eliminates independent key management and reduces the burden on the DRM server. In our scheme, user is labeled with a set of attributes and CEK is associated with access policy, only the user whose attributes satisfy access policy of content can recover CEK, which also achieves fine-grained access control. Moreover, to improve Muller et al.’s DRM scheme, our scheme achieves dynamic authorization by adding action control in the license, while the action control is related to user’s payment. Hence, when the user accesses the content, attributes comparison and license checking must be enforced, which lowers the trust required in DRM client. The analysis and comparison show our scheme is efficient and secure.

Development of authorization mechanisms for secure data access by an outsized community of users in Associate in Nursing open atmosphere is a crucial downside within the ever-growing web world. During this paper we have a tendency to propose a procedure dynamic trust model for user authorization, nonmoving in findings from scientific discipline. In contrast to most existing procedure trust models, this model distinguishes trusting belief in integrity from that in ability totally in numerous contexts and accounts for sound judgment within the analysis of a selected trustee by different trustors. Simulation studies were conducted to match the performance of the projected integrity belief model with alternative trust models from the literature for various user behavior patterns. Experiments show that the projected model achieves higher performance than alternative models particularly in predicting the behavior of unstable users.

그리드 컴퓨팅에서 가상조직은 분산되어 있는 여러 자원들과 사용자들로 구성된다. 가상조직을 구성하는 일은 그리드 컴퓨팅에서 중요한 일이다. 가상조직은 목적에 따라 동적으로 구성되며 목적을 완성하고 사라진다 기존의 가상조직을 위한 권한 위임 구조들은 하나의 가상조직 환경에 중점을 두며 동적인 가상조직 환경을 고려하지 못하고 있다. 또한 자원 제공자, 가상조직 관리자, 그리고 사용자 모두를 위한 상세한 권한 위임 기법을 제공하지 않는다. 이 논문에서 우리는 동적인 가상조직에서 티켓을 이용한 상세한 권한 위임 서비스인 TAS 아키텍처를 제안한다. 기존의 아키텍처와 다르게 TAS 아키텍처는 티켓을 사용하여 여러 가상조직들을 위한 상세한 권한 위임 서비스를 제공한다.