[Retracted] Blockchain-Based Trust Management Framework for Cloud Computing-Based Internet of Medical Things (IoMT): A Systematic Review

Table 3

Comparison of trust-based approaches in cloud computing.

Ref	Focus	Strengths	Type	Software used	1	2	3	4	5
[49]	Provide a trusted service brokering scheme to deal with multiple user requests for cloud resources	Robust in managing different dynamic service behavior at numerous cloud sites	Prototype	Eucalyptus—cloud environment				Y	Y
[50]	Provided a trust evolution approach for cloud computing to eliminate the limitation of the existing trust model	It includes factors like user requirements, aggregates qualitative and quantitative evaluation, and incorporates user feedback in the trusted computing	Trust evaluation approach	--				Y	Y
[51]	Proposed a trust model for a cloud application to address the security issues	1. Trust function in the given trust model to secure from a security attack	Model		Y
		2. The developed trust model provides integrity, access control, availability, and privacy
[52]	A fuzzy logic-based trust calculation scheme by which trust is provided by service provided to the participants	To determine the trustworthiness of the cloud supplied using a fuzzy logic-based rating approach to convert the result and compliance values into rating	Scheme	MATLAB			Y		Y
[53]	A trust evaluation model based on fuzzy logic to predict trust values	Prediction of trust value based on clouds’ user feedback	Evaluation model	MATLAB		Y	Y		Y
[54]	An SLA-based trust model was developed using user behaviour evaluation	Selection of cloud provided based on the SLA parameters	Model	MATLAB	Y			Y
[55]	A trust model in insecure clouds based on domain partitions to address the issue of overhead and performance of cloud system	Efficient and accurate computation of trust	Model	MATLAB	Y	Y
[56]	A trust management framework for securing the platforms of cloud computing	Allows the administrator to make decisions and manage the degree of redundancy and cost of resources	Framework	---			Y	Y
[57]	A trust architecture allows cloud customers to make decisions about cloud providers based on their reputation	Low overhead	Architecture	N/W simulator	Y				Y
[58]	A trust management system to evaluate trust and reputation	The system developed is secured and maintains the trust and reputation of the cloud service provider	Evaluation management system	--	Y	Y
[59]	A trust evaluation model for improving trust	Robust and secure	Evaluation model	MyEclipse	Y			Y
Challenges—1. Centralization. 2. Trust evidence. 3. Less adaptive. 4. Huge management overhead. 5. Inaccuracy.