Abstract
We present the design and evaluation of a Datalog engine for execution in Graphics Processing Units (GPUs). The engine evaluates recursive and non-recursive Datalog queries using a bottom-up approach based on typical relational operators. It includes a memory management scheme that automatically swaps data between memory in the host platform (a multicore) and memory in the GPU in order to reduce the number of memory transfers. To evaluate the performance of the engine, three Datalog queries were run on the engine and on a single CPU in the multicore host. One query runs up to 200 times faster on the (GPU) engine than on the CPU. © Springer-Verlag Berlin Heidelberg 2011.

Abstract
New governmental legislation introduced e-prescription as mandatory in the Portuguese health system. This changes consequences were not properly considered, which caused security problems related to patient and prescriber's data, such as digital identity fraud or access to prescriptions history to build clinical profiles. In order to evaluate the e-prescribing software users awareness to those risks, a survey took place, and the results revealed ignorance of certain obligations and procedures of the e-prescribing process. A significant part of doctors are not conscious about where the patient's data is stored neither about the risks related with prescription's information.

Abstract
In medical organizations, healthcare providers need to have fast access to patients' medical information in order to make accurate diagnoses as well as to provide appropriate treatments. Efficient healthcare is thus highly dependent on doctors being provided with access to patients' medical information at the right time and place. However it frequently happens that critical pieces of pertinent information end up not being used because they are located in information systems that do not inter-operate in a timely manner. Unfortunately the standard operational mode for many healthcare applications, and even healthcare institutions, is to be managed and operated as isolated islands that do not share information in an efficient manner. There are many reasons that contribute to this grim state of affairs, but what interests us the most is the lack of enforceable security policies for systems interoperability and data exchange and the existence of many heterogeneous legacy systems that are almost impossible to directly include into any reasonable secure interoperable workflow. In this paper we propose a RBAC mobile agent access control model supported by a specially managed public key infrastructure for mobile agent's strong authentication and access control. Our aim is to create the right means for doctors to be provided with timely accurate information, which would be otherwise inaccessible, by the means of strongly authenticated mobile agents capable of securely bridging otherwise isolated institutional eHealth domains and legacy applications.

Abstract
Efficient healthcare is thus highly dependent on doctors being provided with access to patients medical information at the right time and place. However it frequently happens that critical pieces of pertinent information end up not being used because they are located in information systems that do not interoperate in a timely manner. There are many reasons that contribute to this grim state of affairs, but what interests us the most is the lack of enforceable security policies for systems interoperability and data exchange and the existence of many heterogeneous legacy systems that are almost impossible to directly include into any reasonable secure interoperable workflow. The objective of this paper is to establish a mobile agent access control model based on RBAC model that allows the exchange of clinical information between different health institutions that fall within the same circle of trust. © 2013 Springer-Verlag.

Abstract
Nowadays the use of mobile devices, such as smartphones and tablets, are rapidly increasing in network services, proliferating to almost every environment. This massive appearance of mobile devices creates significant opportunities to leverage these mobile devices to establish novel types of services. However there are also significant concerns about the privacy and security of sensitive data exchanged and stored on these devices. Since these devices are usually embodied with numerous characteristics like camera devices, 3G and NFC connection that can be used to create new alternative authentication schemes in order to guarantee users identity. This paper performs a survey on the current state of the art in alternative authentication mechanisms regarding access and authentication against the traditional login and password scheme by the usage of the mobile devices and their properties.

Abstract
In this chapter, the authors propose and describe an identity management framework that allows users to asynchronously control and effectively share sensitive dynamic data, thus guaranteeing security and privacy in a simple and transparent way. Their approach is realised by a fully secure mobile identity digital wallet, running on mobile devices (Android devices), where users can exercise discretionary control over the access to sensitive dynamic attributes, disclosing their value only to pre-authenticated and authorised users for determined periods of time. For that, the authors rely on an adaptation of the OAuth protocol to authorise and secure the disclosure of personal-private user data by the usage of token exchange and new XML Schemas to establish secure authorisation and disclosure of a set of supported dynamic data types that are being maintained by the personal mobile digital wallet. The communication infrastructure is fully implemented over the XMPP instant messaging protocol and is completely compatible with the public XMPP large messaging infrastructures already deployed on the Internet for real time XML document interchange. Copyright (C) 2013, IGI Global. Copying or distributing in print or electronic forms without written permission of IGI Global is prohibited.