Abstract A single cloud cannot meet all types of complicated business process requirements for the sake of vender lock-in, lack of fault tolerance and security uncertainty. Therefore, multi-cloud environment (MCE) is a promising solution in competitive market. Nevertheless, uncertainty relevant to security principles such as availability, integrity and confidentiality is the main challenge in this ambit. Virtualization as a key technology is... A single cloud cannot meet all types of complicated business process requirements for the sake of vender lock-in, lack of fault tolerance and security uncertainty. Therefore, multi-cloud environment (MCE) is a promising solution in competitive market. Nevertheless, uncertainty relevant to security principles such as availability, integrity and confidentiality is the main challenge in this ambit. Virtualization as a key technology is pervasively being exploited in data centers; so, variety known/unknown cybersecurity attacks threat mutli-tenant cloud datacenters. On the other hand, each service provider publishes same web services with different pricing scheme and different security level. We propose a framework in which every cloud can register its pricing scheme and its cybersecurity threats on a data warehouse via its broker module. Later, each security level can be measurable by our novel approach. Then, the web service composition problem is modeled to multiobjective optimization by monetary cost and cybersecurity viewpoints. We design and implement a multi-objective genetic approach to combine web service composition based on user cost and security requirement. Our proposed method well constitutes Pareto curve by finding non-dominance points. Simulation on different scenarios proves our approach dominance against a single objective heuristic ones. Read More Read Less

Abstract Since past few years, there has been a rapid increase in use of attacks or cyber crime over the cyber space and one of the most common attacks used is the distributed denial of service attack. These attacks leads for use in the variety of both the attacks and the defence approaches. In this paper, classification of the available mechanisms which are... Since past few years, there has been a rapid increase in use of attacks or cyber crime over the cyber space and one of the most common attacks used is the distributed denial of service attack. These attacks leads for use in the variety of both the attacks and the defence approaches. In this paper, classification of the available mechanisms which are proposed in the literature on how to keep the cyber space away from the possible DDoS attacks and discuss the strong and weak points of each mechanism. This provides the better understanding of the problem and enables a security administrator to effectively equip his storages with proper prevention mechanisms for fighting against DDoS attacks. The paper investigated multiple nature of the problem and look for its causes, further presenting brief insights and suggested approaches for defending against DDoS attack. Read More Read Less

Abstract Users can assess the visual appeal of a web page within 50 milliseconds and color is the first thing noticed onscreen. That directly influences user perception of the website and choosing appealing color combinations may therefore be crucial for successful web design. The aim of this article was to identify, formulate, and evaluate design guidelines to support designers in the process of combining... Users can assess the visual appeal of a web page within 50 milliseconds and color is the first thing noticed onscreen. That directly influences user perception of the website and choosing appealing color combinations may therefore be crucial for successful web design. The aim of this article was to identify, formulate, and evaluate design guidelines to support designers in the process of combining color hues for websites in the context of the Swedish and Thai cultures. A quantitative methodology was used to evaluate the proposed design guidelines. The results showed that culture play a role when evaluating color hue combinations. More specifically, Thai participants rated Thai designs significantly higher than Swedish participants, but the reverse was not true for Swedish designs. Thai designs were as well rated higher than Swedish designs by all participants. The results may have implications for practitioners working in the area of web design and to the broader debate whether color is culturally relative. Read More Read Less