In the past, Mandatory Access Control (MAC) systems have used very rigid policies that were implemented in particular protocols and platforms. As MAC systems become more widely deployed, additional flexibility in mechanism and policy will be required. While traditional trusted systems implemented Multi-Level Security (MLS) and integrity models, modern systems have expanded to include such techn...

Recent years have seen an increasing popularity of online collaborative systems like social networks and web-based collaboration platforms. Collaborative typically offer their users a digital environment in which they can work together share resources information. These information might be sensitive and, thus, should protected from unauthorized accesses. Multi-party access control is emerging ...

The aim of this clinical study was to investigate the acid resistance of enamel lesions remineralized in situ by a sugar-free chewing gum containing casein phosphopeptide-amorphous calcium phosphate nanocomplexes (CPP-ACP: Recaldent). The study utilized a double-blind, randomized, crossover design with two treatments: (i) sugar-free gum containing 18.8 mg of CPP-ACP, and (ii) sugar-free gum not...

Group communication systems increasingly provide security services. However, in practice, the use of such systems is complicated by the divergent requirements and abilities of group members. In this paper, we define a policy language called Ismene that directs the provisioning of security-related resources at member sites. The communication service is defined through a reconciliation of a group...