Elastic Trust Model for Dynamically Evolving Trust Frameworks

Abstract

Today, trust plays a central role in services in distributed environments. Conventionally deployed trust has been based on static framework in which a server responds to a service request under statically determined policies. However, in accordance with evolution of distributed environments empowered with IoT and federated access mechanisms, dynamic behavior must be analyzed and taken into service provision, which conventional trust cannot properly handle. In this paper, we propose an extension of PDP (Policy Decision Point) in which assertions together with service requests are evaluated. Furthermore, the evaluation may be dynamically configured in dynamically evolving trust environment. We propose an elastic trust model in view of dynamic trust environment. This enables intuitionistic modeling of typical concrete elastic distributed services.

Elastic Trust Management in Decentralized Computing Environments

“…In [3], we have modeled a distributed system in which each knowledge and trust of an enrolling node grows or shrinks by exchanging "assertions." We first sketch it, emphasizing the role of PDPs.…”

“…In the figure, we note that −→ and =⇒ are commutative. As applications of this system, typical scenarios of blockchain and trust update by environment monitoring are analyzed in [3].…”

“…We start by modeling the knowledge exchange among the nodes that trust each other (modeling of classic trust frameworks) and extend the model to express the elasticity of trust. This theory is from [3], and will be applied to a decentralized system.…”