English

Shor's algorithms for the integer factorization and the discrete logarithm problems can be regarded as a negative effect of the quantum mechanism on publickey cryptography. From the computational point of view, his algorithms illustrate that quantum computation could be more powerful. It is natural to consider that the power of quantum computation could be exploited to withstand even quantum adversaries. Over the last decade, quantum cryptography has been discussed and developed even from the computational complexity-theoretic point of view. In this paper, we will survey what has been studied in quantum computational cryptography.

A service-oriented architectural (SOA) model is proposed for power system reliability analysis especially for generating capacity adequacy evaluation. Generating system adequacy evaluation is performed to evaluate the ability of the system generating capacity to meet the total system demand. The proposed SOA model is composed of generation system reliability (GSR) service provider, power system service registry and service requester. The data pertaining to power system reliability analysis are represented in extensible markup language (XML) for exchanging the reliability data among the users and service providers. The GSR service provider describes the reliability evaluation services and publishes them to the power system service registry. The calling sequences of reliability evaluation services along with required data are configured as SOAP (Simple Object Access Protocol) messages and the proposed SOA model communicates between the service provider and the service requester with formally defined messages. The proposed model for generating system reliability analysis is highly distributed and has inherent features such as scalability and flexibility and provides a loosely coupled environment for power system reliability analysis.

This paper addresses a single-machine scheduling problem with nonresumable jobs and flexible maintenance activities (SJM) and its online version SJMO. It is showed that the competitive ratio of the classical list scheduling (LS) algorithm is 2 for SJMO, and it is the best possible polynomial time approximation algorithm for SJMO from both the competitive ratio point of view unless P = NP and the computational time complexity point of view. Based on the relationship between SJM and SJMO, it is showed that the LS algorithm is the best possible polynomial time approximation algorithm for SJM from both the worst-case ratio point of view unless P = NP and the computational time complexity point of view, which is a significant improvement of some of the existing results on SJM and its special case in the literature. Note that the worst-case ratio of the classical longest processing time first (LPT) algorithm is also 2 for SJM. In order to show which algorithm is better for SJM on average, numerical experiments are conducted. Computational results show that the LPT algorithm performs better than the LS algorithm in all combinations from an average-case error point of view.

In the article essence of the system of economic security is certain enterprise, and also him basic descriptions. Interpretation of concept «security of enterprise service» is given and it is enumerated functions that is executed by security service. It is indicated on that the list of functions can change on every enterprise depending on his aims. Basic objects that is guarded by security service are in-process enumerated. The row of the stages recommended businessmen at creation of economic security service that consist of is presented: decision-making about the necessity of creation of economic security; determination of general tasks of economic security service; development of position is about economic security, determination of structure and claim of the states service; set of shots. Development of position about economic security, determination of structure and claim of the states service an organizational structure over of economic security of enterprise, that evidently leads to a considerable role in this structure of security of enterprise service, is Brought. Basic subdivisions of security service are indicated in the presented structure, such as: marketing service, service of economic secret service, analytical services, technical departments, service of guard. The basic criteria of estimation of efficiency and reliability of security service are certain. The basic factors of influence are exposed on functioning of security service, such as: economic activity, legality, competence, efficiency, duplication of functions

The Service Oriented Architecture (SOA) concept facilitates building flexible services that can be deployed in distributed environment, and executed on different hardware and software platforms. On the other hand SOA paradigm rises many challenges in the area of Quality of Service and resources utilization. In the paper Resources Distribution Manager (RDM) that manages resources and service delivery in order to satisfy user requirements and service provider's needs is presented. Requests for services are distributed to selected virtualized instances of services or optionally new instances are created for handling the requests. The allocation decisions are based on the knowledge about the communication resources and the current load of computational resources which are dynamically monitored by special RDM module. The decision on the resources allocation is then compared with its utilization during service execution and causes changes in allocation strategy.

Current learning approaches are teacher oriented. The teacher is in control of the elements of the entire learning process. But different students have different capabilities and constraints. The student should be able to select the teaching style and method that best meets his requirements, while taking into consideration his capabilities and constraints. Due to the wide popularity of service-oriented architecture (SOA) and cloud computing, we propose an extended SOA model. This model extends traditional SOA models to support the provision of richer services that enable service providers to reach a wide range of customers and enable service requesters to find services that best match their requirements taking into consideration their capabilities. In the context of this paper, service providers are course providers and service requesters are the students. This paper also introduces a novel formal model for the specification of our newly introduced richer services.

Quality of service (QoS) is an important consideration in the dynamic service selection in the context of service oriented architectures. This paper extends previous work on QoS brokering for SOAs by designing, implementing, and experimentally evaluating a service selection QoS broker that maximizes a utility function for service consumers. Utility functions allow stakeholders to ascribe a value to the usefulness of a system as a function of several attributes such as response time, throughput, and availability. This work assumes that consumers of services provide to a QoS broker their utility functions and their cost constraints on the requested services. Service providers register with the broker by providing service demands for each of the resources used by the services provided and cost functions for each of the services. Consumers request services from the QoS broker, which selects a service provider that maximizes the consumer's utility function subject to its cost constraint. The QoS broker uses analytic queuing models to predict the QoS values of the various services that could be selected under varying workload conditions. The broker and services were implemented using a J2EE/Weblogic platform and experiments were conducted to evaluate the broker's efficacy. Results showed that the broker adequately adapts its selection of service providers according to cost constraints.

Dynamic Grid computing is a process of Share the grid balanced resources and services in a large-scale worldwide distributed Environment with fault free run time application. Resource management technique (RMT) jointly works with grid broker for an elastic grid computing. Broker that acts as a middle man to the stock exchange and place trade on behalf of clients. Special care must be taken when using broker in shopping application. Broker based Resource Management (BRM) have a lot of intelligent techniques like Request Deployment, Job Handle, Grid Resource Discovery, Match making, Optimization, Job Migration, Job scheduling, Middleware supports, Meta brokers, Resource brokers, Dispatcher. In BRM, Broker keeps track of information about all the Resource in its resource pool, including their availability, load, network accessibility, usage models, capabilities, and pricing information and the range of computational tasks that they can perform. The resource broker provides pairing services between the service requester (Buyer) and the service provider (supplier). The resource broker selects the best scheduler for the resource execution job, and collaborates with the scheduler to execute the multi tasks. Agents are only responsible for the timely and accurate processing of forms. Its works for some limited agency certified based company that is Agents are working for some particular service provider's company only. But broker work for all companies (all service providers). From the broker's service, all types of services requester (variety of different purchaser) is benefited. Example: Product requester detects the all brands of the particular products details displayed through broker, but agent display only agencies certified company's product details only. Broker is an agent that heads the whole hierarchy, maintaining all service information of the system. Consumers are searching the products from their related Image or text or video through broker based on linear programming solution. Benefits of this shopping system are save the price and get a quality product through broker's suggestion based shopping and location via product ranking based shopping.

In this study an explicit finite difference scheme is developed to solve the Maxwell’s equations in time domain for a lossless medium. From the physical point of view, the hyperbolic system of Maxwell equations shall be discretized explicitly. From the computational point of view, this developed three-dimensional explicit scheme can be more effectively implemented in parallel in CPU/GPU with the Nvidia K-20 card. From the mathematical point of view, symplectic scheme is adopted for the approximation of temporal derivative terms so that all Hamiltonians in Maxwell’s equations can be conserved at all times. Moreover, to predict the long-time accurate solution a phase velocity preserving scheme is developed for the spatial derivative terms so that the chosen time increment and grid spacing can be excellently paired following the employed theoretical guideline. Computational performance will be assessed based on the results obtained from the computed results in one GPU card and in one I7-4820K CPU card.

Since the Internet of Things (IoT) will be entwined with everything we use in our daily life, the consequence of security flaws escalates. Smart objects will govern most of the home appliances and car engines yielding potential disaster scenarios. In this context, successful attacks could lead to chaos and scary scenarios (www.darkreading.com). Unprotected personal information may expose sensitive and embarrassing data to the public and attacks may threaten not only our computers and smart devices, but our intimacy and perhaps our lives too. Because persons and objects will be bonded with each other, user consent becomes critical. Therefore, thing, object, and user Identity will be the focus of future IoT security solutions, yielding a Trust, Security, and Privacy (TSP) paradigm, which may constitute the Achilles' heel of IoT. While security issues are quite straightforward, mainly from background knowledge, privacy issues are far more complex. Privacy constitutes a rather challenging task, even for the m...

Interorganizational cooperation is more and more organized by the paradigm of services. Service-oriented architectures (SOA) provide a general framework for service interaction. SOA describe three roles of services, the service provider, the service requester, and the service broker, together with the three operations publish, find, and bind. We provide a formal method based on nondeterministic automata to model services and their interaction. In this paper, we restrict ourselves to finite and acyclic automata. We suggest operating guidelines as a convenient and intuitive artifact to realize the publish operation. In our approach, the find operation reduces to a matching problem between the requester's service and the published operating guidelines. If matching services are actually bound together, our approach guarantees deadlock-free communication. In this paper, matching of deterministic as well as nondeterministic automata with operating guidelines is presented.

Service-Oriented Architecture is a new paradigm in Software computing that focused on web-based Service-Oriented computing. This paradigm based on client services architecture and involves communication among three different entities: Service Provider, Service Consumer and Service Broker or Registry. These three entities are loosely coupled. Security is an important aspect for any application. In SOA, managing and organizing security is a challenging issue, because services are deployed in distributed environment. In SOA, security is defined in terms of services which are secure service registration and deregistration, secure service discovery, secure service delivery and availability of trustworthy services. This paper proposed a Kerberos based security framework that fulfills the security requirement needed for secure SOA. The implementation of the proposed security framework is also provided.

This paper proposes a framework for security services for Voice over IP (VoIP) and Voice over LTE (VoLTE) in commercial networks using Software-Defined Networking (SDN) and Network Functions Virtualization (NFV). The VoIP/VoLTE services are exposed to several security threats such as Denial-of-Service (DoS) attack, network sniffing, unauthorized services access, and VoIP spam. The conventional security services for VoIP/VoLTE suffer from the lack of flexible security rule installation and dynamic security rule update. The security service framework for VoIP/VoLTE based on SDN and NSF in this paper suggests an advanced way to deal with the security threats. For different security threats, the framework can flexibly install new rules and dynamically update these rules. Based on a YANG data model for remote networked-device configuration, we implemented basic configuration functions of the security service framework for VoIP/VoLTE. In order to show the feasibility of the proposed framework, we used OpenDaylight for our implementation that can provide VoIP/VoLTE service providers with effective security services.

Service Oriented Architecture (SOA) has been widely used during the past decade due to its ability to seamlessly integrate various applications developed using different technologies. Web services based on open standards are the most commonly used technology to realize an SOA. Business processes are executed by appropriate orchestration of various services from different departments that belong to a single organization or from multiple organizations. Security is an important quality attribute that has to be built into any application that is developed using SOA. XML is the underlying technology for Web Service Description Language (WSDL), SOAP protocol and Business Process Execution Language (BPEL). It is highly probable that an attacker could inject malicious information into these XML files to modify the flow of the business process. Further, SOAP was not designed with security in mind, it is possible to tamper the SOAP messages while they are in transit. There exist a number of such potential vulnerabilities which lead to possible security breach in the individual services. In an orchestrated business process, there are possibilities of more vulnerabilities. One of the existing tools namely WS-Attacker is only capable of testing the security of individual web services alone. In spite of the widespread usage of SOA, currently there is limited automatic tool support for testing the security provided by an entire SOA application involving service orchestration. In this context, this paper focuses on designing and implementing a plug-in for WS-Attacker to analyze a few security vulnerabilities present in SOA business processes.

This paper seeks to improve the understanding of how service-based companies can benefit from developing and delivering service offerings from a standardised core of service modules, which are organised through a service architecture. Research within the field is relatively sparse, and there is scope for an explicit definition of elements related to the development of modular service platforms and architectures. A study of the existing literature, combined with a comprehensive case study in a global engineering consultancy, has created the basis for development and evaluation of the conceptual model for modular service design synthesis presented in this paper. The case study is based on internal documentation and a high level of interview data. Inductive research methods have been used for the analysis. The presented conceptual model defines three suggested dimensions (Market Segmentation, Service Roadmap and Service Architecture Layout) to be included in development of modular service platforms and architectures. Testing indicates a significant standardisation potential for service configuration across service families. Our understanding is that the approach can increase strategic flexibility and adaptability to changes in a quick evolving service market. The empirical part of this paper is exploratory in nature and is limited to one provider of high-end engineering consultancy services. Thus, further research will be needed to verify the aspects of the presented methodology to allow a further generalisation of our findings. Nevertheless, this paper contributes to the emerging literature on service modularity by presenting a specific operational approach for description and utilisation of modular service platforms and architectures.