## 9 Classification and Comparison
\begin{table}
\begin{tabular}{p{14.2 pt} p{142.3 pt} p{142.3 pt} p{142.3 pt} p{142.3 pt} p{142.3 pt} p{142.3 pt}} \hline \hline
**Security Model** & **Ref** & **Technologies and Techniques Used** & **Security Requirement** & **Benefits of the Proposed Scheme** & **Evaluation of the Proposed Scheme** & **Challenges in Proposed Scheme** \\ \hline \hline \multirow{8}{*}{**Blockchain Model**} & \multirow{8}{*}{[78]} & Blockchain technology, AVISPA & \multirow{8}{*}{Mutual authentication, Cooja simulator} & Lightweight framework for authentication and permission to complement current blockchain-based IoT networks in the healthcare sector & \multirow{8}{*}{Minimization of transmission costs and computing overhead} & Not assessed on hardware in a realistic context, making it less efficient \\  & & Blockchain technology, fine-grained access control & Privacy confidentiality, and integrity & large-scale health data privacy preserving scheme based on blockchain technology & System can meet the expected security requirements and requirements and can be applied to mobile health systems & \multirow{8}{*}{Insided attacks are neglected by the system.} \\  & & & & & \\ \hline \hline \multirow{8}{*}{[80]} & \multirow{8}{*}{[79]} & Blockchain technology, fine-grained access control & Privacy confidentiality, and integrity & large-scale health data privacy preserving scheme based on blockchain technology & System can meet the expected security requirements and can be applied to mobile health systems & \multirow{8}{*}{Insided attacks are neglected by the system.} \\  & & & & & \\ \hline \hline \multirow{8}{*}{[80]} & \multirow{8}{*}{[79]} & Blockchain technology, fine-grained access control & Privacy confidentiality, and integrity & large-scale health data privacy preserving scheme based on blockchain technology & System can meet the expected security requirements and can be applied to mobile health systems & \multirow{8}{*}{Insided attacks are neglected by the system.} \\  & & & & & \\ \hline \hline \multirow{8}{*}{[80]} & \multirow{8}{*}{[79]} & Blockchain technology, fine-grained access control & Privacy confidentiality, and integrity & large-scale health data privacy preserving scheme based on blockchain technology & System can meet the expected security requirements and can be applied to mobile health systems & \multirow{8}{*}{Insided attacks are neglected by the system.} \\  & & & & & \\ \hline \hline \multirow{8}{*}{[80]} & \multirow{8}{*}{[78]} & \multirow{8}{*}{[81]} & Framework for cross-reviewing the common secret session key of communication (CE), communication entities and establishing mutual authenticity for TMIS system using the cloud environment (CE) & Security and performance efficiency, resistance to sensitive threats, and does not meet all security requirements & \multirow{8}{*}{Insided for TMIS systems, and does not meet all security requirements} \\  & & & & & \\ \hline \hline \multirow{8}{*}{[13]} & Attribute-based encryption (ABE), HLFSL language, AVISPA automated tool & A secure communication, medical applications utilizing ABE for authentication in HetNet at the network layer & Better protection of health data against in intruders, minimization of transmission costs and computational load & Attribute threshold requirement for authentication, use of a third-party trusted authority (if this third party is hacked, all data is subject to hostile attacks) & Attribute threshold requirement for authentication, authentication, use of a third-party trusted authority (if this third party is hacked, all data is subject to hostile attacks) & \multirow{8}{*}{The proposed authentication scheme based on the robustness of client could authentication the IoMT, which does not store any data and supports scalability} & \multirow{8}{*}{The system failed to verify that the client could authenticate the security requirements and supports scalability} & \multirow{8}{*}{Low system accuracy rates} \\  & & & & & \\ \hline \hline \multirow{8}{*}{[82]} & \multirow{8}{*}{[81]} & \multirow{8}{*}{[81]} & A lightweight and robust authentication scheme based on the physical (PUFs) & The proposed authentication scheme increases the robustness of the design while function (PUF) for the IoMT, which does not store any data from the IoMT and services & \multirow{8}{*}{The proposed authentication scheme increases the robustness of the design while function (PUF) for the IoMT, which does not store any data from the IoMT and supports scalability} & \multirow{8}{*}{The system failed to verify that the client could authenticate the security requirements and can be applied to ensure the anonymity of the data source from a cloud from a cloud perspective perspective} \\  & & & & & \\ \hline \hline \end{tabular}
\end{table}