## 3 The Proposed IoMT Model  
The aim of the IoMT is the ubiquitous deployment of home-based healthcare. Various healthcare centres and research institutes should also be able to communicate with one another and access permitted information from the cloud. With all this in place, the privacy of the patient information and query access of the information in an IoMT should be preserved. The IoMT model presented in this paper assumes that a patient can receive medical treatment in any healthcare centre that is connected to the cloud. In this scenario, the patient ID and other information about the identity of the patient have to be provided by the patient in order to provide healthcare access to medical records of the patient. Authorized doctors from the healthcare centre where the patient registered can access the medical record of the patient upon providing identification and the right key. Research  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Reference** & **Title** & **Method** & **Strength** & **Weakness** \\ \hline \multirow{4}{*}{[45]} & Lightweight Feist & \multirow{4}{*}{Feistel structure and \(\,\)} & \multirow{4}{*}{Higher attack resilience} & The cipher has low \\  & structure-based hybrid & & & entropy In addition, \\  & crypto model for & & & privacy issue was \\  & multimedia data security & & & not addressed \\  & over uncertain & & & \\  & cloud environment & & & \\ \hline \multirow{4}{*}{[46]} & Hybrid optimization with & \multirow{4}{*}{Elliptic curve \(\,\)} & High peak signal to \(\,\) & Only security of the \(\,\) \(\,\) \(\,\) \(\,\) \(\,\) \(\,\) \(\,\) \(\  
institutions accessing the healthcare cloud will only be able to access information based on the agreement during the registration with the healthcare centre.  
The proposed IoMT model has three stages: data acquisition, data storage, and application stages. Three things are involved in the data acquisition stage: acquisition of the data by the sensor, encryption of the acquired data, and computation of the storage key value for proper storage of the encrypted data on the cloud. The second stage in the proposed IoMT model is the storage of the encrypted data on the cloud. The cloud here uses B+ file organization, where the data are positioned on the cloud based on the key attached to the data. The third stage in the proposed model is the application stage, where authorized doctors, patients who visit another healthcare centre, and registered research institutions are given permission to access information on the cloud. The proposed IoMT model is predicated on the following premises:  
1. Each healthcare centre has a cloud where information about patients is stored, and various clouds of different healthcare centres are networked together;
2. Patients are embedded with different wireless sensors capable of communicating data to a central sensor connected to the healthcare cloud where the patient has registered;
3. The central sensor is loaded, among other things, with encryption and decryption applications;
4. Information from patients is stored in a central database through the help of a cloud network;
5. A timestamp named \"T\" that is included in every message sent and received ensures the accuracy of the data;
6. No two clients can communicate privately on the IoMT platform. The communication is between the HC and the clients;
7. The architectural design of the proposed IoMT model is depicted in Figure 1.  
The proposed IoMT model in this paper is discussed under the following subsections: (1) generation of initialization parameters, (2) creation of initial shared secret key, (3) registration of the recognized clouds of other healthcare and patients, (4) updating shared key, (5) Secure data transmission, and (6) privacy preservation of stored data on cloud.