Classification of Trust Computation Methodologies Research Paper

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Trust and reputation
Researchers and thinkers in different fields have researched the concepts of trust and reputation.
Trust between sellers and buyers can be termed as the repute that agents have towards a system,
and it is determined by the system designers as well as those who analyze the systems Zacharia
and Maes (1999), Yu and Singh(2000), Houser and Wooders (2001). Besides, trust and reputation
play a vital role in distributed systems in the electronic industry. For instance, the trust model is
witnessed in the Pretty Good Privacy system (Zimmermann, 1995; Khare and Rifkin, 1997).
Reputation systems create the accountability system for users in Free Haven, an anonymous
storage system (Dingledine et al., 2001). System Publius build trust management by enabling users
to distribute materials anonymously in such a way that tampering and censorship of any
distribution or publication is very difficult to alter (Waldman et al. 2000). Marsh (1994), initially
introduced the computational model for trust in the field of computer science literature in a
distributed community. However, numerous limitations exist in his simple computational model.
First, there are few operators and algebraic expressions for modifying the trust model, and thus
there is a challenge in dealing with negative trust values and propagation as well. Second, trust is
expressed in the model as a subjective real numbers within the range +1 and -1, and as a result, the
model reveals challenges at 0 value and extreme values.
On the other hand, reputation can be termed a tool that enhances trust between various entities. It
boosts the effectiveness and efficacy of online communities and services. Entities must rely on the
reputation system because they do not have a one on one experience of other entities.
Trust and reputation properties

Trust is a complex concept that is influenced by several properties, both nom-measurable and
measurable. Since ascertaining the safety of system users and system security vital in gaining trust,
there is a close link between security and trust. Nonetheless, trust is beyond security. Trust not
only associated with security but also other several factors such as availability, reliability, capacity,
and strength, among other characteristics of an entity. Therefore, it can be concluded that trust is
a complex concept and challenging to create, maintain, and certify.

Other than security and privacy is another concept associated with trust; the capability of an entity
to decide to whom and when information pertaining itself ought to be disclosed. A digital system
that is trustworthy must be in a position to maintain the privacy of its users. This is one of the ways
to increase the trust of the users. In emerging technology fields, for instance, Mobile Edge
Computing (MEC), the concepts regarding security, privacy, and trust are imperative.
The concept of trust can be summed according to both objective and individual properties that are
closely related to a choice of trust. As illustrated in table 1 below, the properties that influence
trust can be categorized into five groups.
1. Trustee’s subjective properties, for instance, trustee goodness and honesty.
2. Trustor’s subjective properties, for example...

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