Oriented by requirement of trust management in multiple cloud environment, this paper presents T-broker, a trustaware service brokering scheme for efficient matching cloud services (or resources) to satisfy various user requests. First, a trusted third party-based service brokering architecture is proposed for multiple cloud environment, in which the T-broker acts as a middleware for cloud trust management and service matching. Then, T-broker uses a hybrid and adaptive trust model to compute the overall trust degree of service resources, in which trust is defined as a fusion evaluation result from adaptively combining the direct monitored evidence with the social feedback of the service resources. More importantly, T-broker uses the maximizing deviation method to compute the direct experience based on multiple key trusted attributes of service resources, which can overcome the limitations of traditional trust schemes, in which the trusted attributes are weighted manually or subjectively. Finally, T-broker uses a lightweight feedback mechanism, which can effectively reduce networking risk and improve system efficiency. The experimental results show that, compared with the existing approaches, our T-broker yields very good results in many typical cases, and the proposed system is robust to deal with various numbers of dynamic service behavior from multiple cloud sites.
For realizing the fine-grained access control with non-interactive approach, and effectively guaranteeing the comprehensive security for information under the post-quantum environment, this paper proposes an attribute-based signcryption (ABSC) scheme based on the intractability of lattices. The proposed ABSC scheme is proved indistinguishable against the inner adaptive-chosen ciphertext attacks (IND-CCA2) and existentially unforgeable against inner chosen-message attacks (EUF-CMA), in the standard model. The theoretical analysis presents that the public key size and the computational cost of the signcryption operation are both reduced obviously, compared with the signature and then encryption mechanism. An efficient variant is also presented that significantly decreases the computational complexity of unsigncryption operation at the expense of an increase in the ciphertext size. INDEX TERMS Signcryption, lattice, standard model, attribute-based, fine-grained access control.
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