In Ciphertext Policy Attribute based Encryption scheme, the encryptor can fix the policy, who can decrypt the encrypted message. The policy can be formed with the help of attributes. In CP-ABE, access policy is sent along with the ciphertext. We propose a method in which the access policy need not be sent along with the ciphertext, by which we are able to preserve the privacy of the encryptor. ...

The paper aims at addressing the problem of what makes specific aiding to decide within public policy making problem situations. Under such a perspective it analyses some basic concepts such as “public policy”, “deliberation”, “legitimation”, “accountability” and shows the necessity to expand the concept of rationality which is expected to be behind the acceptability of a public policy. We then...

Policy-based dynamic spectrum access is one of the spectrum access models being considered by regulators and researchers for regulating the behavior of cognitive radios. This approach to spectrum access decouples the policyrelated components (i.e., policy management, provisioning, and reasoning) from the radio platform. In policy-based spectrum access, the policy reasoner plays a critical role—...

Policy-based management (PBM) is being used as technological solution on the managing and controlling complex networks and systems. One of the most important issues involved in the life-cycle of PBM is the policies creation because the future decisions made by the management system depend on this, and therefore, the network behavior. In this paper we present a novel model for creating managemen...

data are essential for scientific research and policy planning. however, there needs to be attention to data quality and the estimates and models based on those data. in addition, data need to be freely available for researchers to test new ideas and validate the work of others through replication, while respondents who provide data need to be protected. three issues concerning data are address...

The paper focuses on transaction context propagation in component-based software architectures, where every component is deployed into a container and client requests may be performed in the scope of a container-interposed transaction. In the existing commercial architectures such as EJB and COM+, the “single attribute approach” is used to specify the transaction context propagation. Being diff...

We demonstrate how an evolutionary agent-based model can be used to evaluate climate policies that take the heterogeneity of strategies of individual agents into account. An essential feature of the model is that the fitness of an economic strategy is determined by the relative welfare of the associated agent as compared to its immediate neighbors in a social network. This enables the study of ...

In this paper, we identify key drivers and barriers for the adoption of building energy retrofits in Germany, which is promoted by public policy as an important measure to address the future challenges of climate change and energy security. We analyze data from a 2009 survey of more than 400 owner-occupiers of single-family detached, semidetached, and row houses in Germany, that was conducted a...