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Trust, security, and privacy are three of the major pillars to assemble thefifth generation network and beyond. Despite such pillars are principallyinterconnected, they arise a multitude of challenges to be addressedseparately. 5G ought to offer flexible and pervasive computing capabilitiesacross multiple domains according to user demands and assuring trustworthynetwork providers. Distributed marketplaces expect to boost the trading ofheterogeneous resources so as to enable the establishment of pervasive servicechains between cross-domains. Nevertheless, the need for reliable parties as``marketplace operators'' plays a pivotal role to achieving a trustworthyecosystem. One of the principal blockages in managing foreseeable networks isthe need of adapting previous trust models to accomplish the new network andbusiness requirements. In this regard, this article is centered on trustmanagement of 5G multi-party networks. The design of a reputation-based trustframework is proposed as a Trust-as-a-Service (TaaS) solution for anydistributed multi-stakeholder environment where zero trust and zero-touchprinciples should be met. Besides, a literature review is also conducted torecognize the network and business requirements currently envisaged. Finally,the validation of the proposed trust framework is performed in a real researchenvironment, the 5GBarcelona testbed, leveraging 12% of a 2.1GHz CPU with 20cores and 2% of the 30GiB memory. In this regard, these outcomes reveal thefeasibility of the TaaS solution in the context of determining reliable networkoperators.

Trust-as-a-Service: A reputation-enabled trust framework for 5G networks