Service Trust Model Research Articles

A probabilistic trust model for cloud services using Bayesian networks

With the industry’s fast adoption of cloud computing, it’s been hard to keep trust between cloud service providers and people who use their services. In fact, trust management in cloud computing has become very challenging given the urgent need for cloud service requesters to choose efficient, trustworthy, and non-risky services. One of the most important factors that can be considered in the applicant’s trust or distrust of a service is the different quality of services related to the service. Therefore, approaches are needed to assess the trustworthiness of cloud services with respect to their quality of service (QoS). Given the uncertainty that exists for cloud services, it is more realistic to model their QoS parameters as random variables and also consider different dependencies between them. In this paper, a new trust model for cloud services is proposed using a Bayesian network, which is a probabilistic graphical model that can be used as one of the best methods to control uncertainty. Using Bayesian networks makes it possible to infer more accurate QoS values, which leads to the selection of highly trustworthy services by several cloud service requesters. To evaluate the proposed trust model, experimental results are performed using a real-world cloud service quality feedback, collected by the $$CloudArmor$$ project. The results of the experiments show that the proposed trust model is highly accurate and significantly reduces the estimation error.

A Bidirectional Trust Model for Service Delegation in Social Internet of Things

As an emerging paradigm of service infrastructure, social internet of things (SIoT) applies the social networking aspects to the internet of things (IoT). Each object in SIoT can establish the social relationship without human intervention, which will enhance the efficiency of interaction among objects, thus boosting the service efficiency. The issue of trust is regarded as an important issue in the development of SIoT. It will influence the object to make decisions about the service delegation. In the current literature, the solutions for the trust issue are always unidirectional, that is, only consider the needs of the service requester to evaluate the trust of service providers. Moreover, the relationship between the service delegation and trust model is still ambiguous. In this paper, we present a bidirectional trust model and construct an explicit approach to address the issue of service delegation based on the trust model. We comprehensively consider the context of the SIoT services or tasks for enhancing the feasibility of our model. The subjective logic is used for trust quantification and we design two optimized operators for opinion convergence. Finally, the proposed trust model and trust-based service delegation method are validated through a series of numerical tests.

TrustCall: A Trust Computation Model for Web Conversational Services

Web conversational services are exposed to several threats in which the social context between communicating participants is manipulated. Cybercrimes based on identity misrepresentation to obtain sensitive information are on the rise. Various scams and frauds are conducted by distributing malicious content, viruses, and spam over established communication sessions. In order to maintain overall security and enhance privacy, methods of estimating trustworthiness and reputation should be built into Web calling services. In this paper, we propose “TrustCall” a reputation-based trust model for real-time Web conversational services. In our approach, the reputation of a caller is evaluated using Authenticity Trust and Behavioral Trust . Authenticity Trust describes the legitimacy of a caller by collecting recommendations from other members of the network, whereas Behavioral Trust determines a caller’s popularity based on its communication behavior. Other contributions include a threat taxonomy for Web calling services, including social threats, that directly target users. A set of experiments are conducted in order to prove the feasibility and effectiveness of our model.

A Multi Dimension Service Trust Model in Social Network

A Multi Dimension Service Trust Model in Social Network

Cloud Service Trust Model and Its Application Research Based on the Third Party Certification

Cloud Service Trust Model and Its Application Research Based on the Third Party Certification

A survey on trust and reputation models for Web services: Single, composite, and communities

Web service selection constitutes nowadays a major challenge that is still attracting the research community to work on and investigate. The problem arises since decision makers (1) cannot blindly trust the service or its provider, and (2) ignore the environment within which the service is operating. The fact that no security mechanism is applicable in such a completely open environment, where identities can be easily generated and discarded makes social approaches such as trust and reputation models appealing to apply in the world of Web services. This survey classifies and compares the main findings that contributed in solving problems related to trust and reputation in the context of Web services. First, a high-level classification scheme partitions Web services into three main architectures: single, composite, and communities. Thereafter, a low-level classification within each architecture categorizes the trust and reputation models according to the technique used to build the trust value. Based on this classification, a profound analysis describing the advantages and shortcomings of each class of models is presented; leading to uncover possible topics that need further study and investigation. In particular, we discuss the challenging problem of having active malicious Web services in the composite and community-based architectures. Thus, the paper can be used by the future researchers as a roadmap to explore new trust and reputation models for Web services taking into account the shortcomings of the existing models.

An Evidential Trust Model for Web Services Based on Fuzzy Sets

Abstract Trust models assist users in Web services to evaluate each other by assigning trust scores and decide whether to trust or not. Many trust models have proposed several belief functions for measuring the uncertainty associated with trust scores using Dempster-Shafer or Bayesian theory. However, the representation of trust scores in these models does not take into account the uncertainty induced by vagueness. In this work, we propose a fuzzy evidential trust model in which trust scores are considered as fuzzy focal elements consisting of fuzzy trust, distrust, ignorance and conflict. Further, we provide various operators for trust propagation and aggregation based on fuzzy evidential theory. Finally, in order to demonstrate the effectiveness of our proposed model, we present some intuitive results.

Incorporating Attitude towards Islamic Banking in an integrated Service Quality, Satisfaction, Trust and Loyalty Model

The Islamic banking is an emerging concept and has gained valuable acceptance not only in the Islamic countries but all over the world and has a visible growth. The purpose to conduct the current study is to empirically check the effect of consumer attitude towards Islamic banking on the customer’s perceived service quality regarding banking services and customer satisfaction with banking services. The proposed research model also investigate the relationships among variables like perceived service quality, customer satisfaction, customer trust and customer loyalty. A survey questionnaire was designed for data collection from the respondents that are the regular users of Islamic banks in Bahawalpur, Pakistan. The method used to collect data was convenience sampling in order to collect data from customers of 4 Islamic banks in Bahawalpur that are Meezan Bank, Bank Islami, Dubai Islamic Bank, and Bank Al-Baraka. Total 200 questionnaires were distributed out of which 163 were collected. Out of 163 collected questionnaires, 157 were in the usable form and used for the final analysis (Regression) using SPSS Ver.20. The results of the study show that attitude towards Islamic banking has a positive impact on the perceived service quality and customer satisfaction regarding the Islamic banking services. Moreover, the results also suggest that perceived service quality also influences customer satisfaction positively, customer satisfaction has positive impact on customer trust and customer loyalty. Furthermore, customer trust also influences customer loyalty positively. The current study enhances the understanding regarding the customer satisfaction, customer trust and customer loyalty and their determinants.

PHAT: A Preference and Honesty Aware Trust Model for Web Services

Trust is one of the most critical factors for a service requestor when selecting a service from a large pool of candidate services. However, existing web service trust models either do not consider users' preferences for different quality of service (QoS) attributes, or ignore the impact of vicious ratings on trust evaluation. To address these gaps, PHAT, a dynamic trust evaluation model with dual consideration of users' preferences and false ratings, is proposed in this paper. The model introduces an approach to automatically mine users' preferences from their requirements. The preferences are then used to determine the weight of each QoS attribute when integrating trust into multi-dimensional QoS attributes. The “local” trust on a service is derived by combining the trust on QoS attributes and the user's subjective ratings. Then, the users are divided into different groups according to their QoS preferences, and the honesty of each group is assessed by filtering out dishonest users based on a hybrid approach combining rating consistency clustering with an average method. Finally, the weight on ratings is dynamically adjusted according to the results of honesty assessment when calculating the global trustworthiness, namely, the reputation of a service. The proposed model is evaluated with real-world QoS data, and the results indicate that PHAT works well on personalized evaluation of trust, and can effectively dilute the influence of malicious ratings.

Incorporating attitude towards Halal banking in an integrated service quality, satisfaction, trust and loyalty model in online Islamic banking context

PurposeThe purpose of this paper is to empirically investigate the influence of consumer attitude towards Halal banking on e‐service quality and e‐satisfaction, in an online Islamic banking context. The proposed model also aims to investigate the relationships among e‐service quality, e‐satisfaction, e‐trust and e‐loyalty.Design/methodology/approachA questionnaire was designed to collect data from the regular users of online services of Islamic banks in Pakistan. Convenience sampling method was adopted to collect data from the existing customers of six Islamic banks, residing in five major urban centres of Pakistan. A total of 350 questionnaires were distributed, out of which 292 returned questionnaires were suitable for further analysis. Structural equation modelling procedure was used to test the proposed research model.FindingsThe results of this research suggest that attitude towards Halal banking positively influences perceived e‐service quality and overall e‐satisfaction with the online services of Islamic banks. Furthermore, perceived online service quality enhances customer e‐satisfaction and their e‐loyalty towards the bank. Similarly, e‐trust mediates the relationship between e‐satisfaction and e‐loyalty.Practical implicationsThis study enhances our understanding of how specific religious attitudes can positively influence consumer assessments of a bank's perceived e‐service quality and their overall e‐satisfaction with it.Originality/valueMuch of the previous research on Islamic banking has been descriptive in its nature. This study contributes to the existing literature by exploring the causal effect of attitude towards Halal banking on consumer perceptions about the e‐service quality and e‐satisfaction with the online services of Islamic banks.

Dynamic Role-based Access Control for Web Services using Context and Trust

Currently, the security issues of Web services are hot area in information system (IS). This research mainly discusses the key technologies of information access control focusing on following works: After analyzing the dynamic characteristic of application nature for Web services, a Dynamic Role-Based Access Control using Context and Trust model (abbreviated as CT-DRBAC) for Web services is proposed. During Web services, both the subject of invoking request and object of providing service resources are dynamic nature. So, access policies are needed to consider the dynamic nature. The proposed model has been developed and the authorization framework is discussed detail. In order to implement the dynamic trust management mechanism, a dynamic user role authorization algorithm which considers the user lifecycle contexts in the open systems is proposed and designed to meet the dynamic characteristic of subject and object effectively, and achieve intelligent and scientific user role assignments. The proposed access control module can be used in intelligent information systems to grant dynamically roles to users according to the current context.

Using Web Service Enhancements to Establish Trust Relationships with Privacy Protection (Extended and Invited from ICWS 2006 with id 47)

The lack of effective trust establishment mechanisms impedes the deployment of diverse trust models for web services. One issue is that collaborating organizations need mechanisms to bridge extant relationships among cooperating parties. We describe an indirect trust establishment mechanism to bridge and build new trust relationships from extant trust relationships with privacy protection. Another issue is that a trust establishment mechanism for web services must ensure privacy and owner control. Current web service technologies encourage a service requester to reveal all its private attributes in a pre-packaged credential to the service provider to fulfill the requirements for direct trust establishment. This may lead to privacy leakage. We propose a mechanism whereby the service requester discovers the service provider’s requirements from a policy document, then formulates a trust primitive by selectively disclosing attributes in a pre-packaged credential to negotiate a trust relationship. Thus the service requester’s privacy is preserved.

An adaptive trust model of web services

This paper proposes a dynamic Web service trust(WS Trust) model, and some corresponding trust metric evaluation algorithms. The main goal is to evaluate the trust-worthiness and predict the future behaviors of entities in order to help users find trustworthy Web service providers and prevent users from providing unfair ratings against service providers.