Biblio

In this paper, we propose an access control model featured with the efficient key update function in data outsourcing environment. Our access control is based on the combination of Ciphertext Policy - Attribute-based Encryption (CP-ABE) and Role-based Access Control (RBAC). The proposed scheme aims to improve the attribute and key update management of the original CP-ABE. In our scheme, a user's key is incorporated into the attribute certificate (AC) which will be used to decrypt the ciphertext encrypted with CP-ABE policy. If there is any change (update or revoke) of the attributes appearing in the key, the key in the AC will be updated upon the access request. This significantly reduces the overheads in updating and distributing keys of all users simultaneously compared to the existing CP-ABE based schemes. Finally, we conduct the experiment to evaluate the performance of our proposed scheme to show the efficiency of our proposed scheme.

Attribute-Based Access Control (ABAC), a promising alternative to traditional models of access control, has gained significant attention in recent academic literature. This attention has lead to the creation of a number of ABAC models including our previous contribution, Hierarchical Group and Attribute-Based Access Control (HGABAC). However, to date few complete solutions exist that provide both an ABAC model and architecture that could be implemented in real life scenarios. This work aims to advance progress towards a complete ABAC solution by introducing Hierarchical Group Attribute Architecture (HGAA), an architecture to support HGABAC and close the gap between a model and real world implementation. In addition to HGAA we also present an attribute certificate specification that enables users to provide proof of attribute ownership in a pseudonymous and off-line manner, as well as an update to the Hierarchical Group Policy Language (HGPL) to support our namespace for uniquely identifying attributes across disparate security domains. Details of our HGAA implementation are given and a preliminary analysis of its performance is discussed as well as directions for future work.

In the open network environment, the strange entities can establish the mutual trust through Automated Trust Negotiation (ATN) that is based on exchanging digital credentials. In traditional ATN, the attribute certificate required to either satisfied or not, and in the strategy, the importance of the certificate is same, it may cause some unnecessary negotiation failure. And in the actual situation, the properties is not just 0 or 1, it is likely to between 0 and 1, so the satisfaction degree is different, and the negotiation strategy need to be quantified. This paper analyzes the fuzzy negotiation process, in order to improve the trust establishment in high efficiency and accuracy further.