Public health and private providers and facilities may shape the future of the US health system by engaging in new ways to deliver care to patients. "Accountable care" contracts allow private health care and public health providers and facilities to collaboratively serve defined populations. Accountable care frameworks emphasize health care quality and cost savings, among other goals. In this a...

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The Internet design is vulnerable to numerous attacks, including source address spoofing, denial of service flooding, prefix hijacking, and route forgery attacks. Despite much research, this situation does not seem to improve: prefix hijacking or denial of service attacks continue to make headline news [10, 25]. This disheartening fact has prompted researchers to propose a radically different I...

In this paper, accounting policies explicitly control resource usage within a contract architecture. Combined with a virtual resource economy, this allows efficient exchange of high-level computer services between untrustworthy participants. These services are specified as contracts, which must be signed by the participants to take effect. Each contract expresses its accounting policy using a l...

In many broadcast applications, fine-grained access control over contents is required to provide differentiated services to users. For this purpose, the content provider may assign sets of attributes to the contents, and user access privileges are defined as logic expressions over these attributes. For example, in a digital video recorder (DVR) system, the content provider might broadcast episo...