# RACHEM: Reinforced Reliable Computing in Cloud by Ensuring Restricted Access Control
## 2 Literature Survey
### Cloud Security Using Access Control Schemes
Furthermore, a probabilistic approach to measure the reliability of a task and ensure data security in the event of unauthorized access and data theft was suggested in [85] by executing multiple task-solver versions concurrently. However, the work did not consider coherency amongst tasks while analyzing the system failure. In this context, coherency refers to the logical or operational dependencies that may exist between the different versions of a task, such as synchronization requirements, shared data processing, or consistency constraints in composite results. By assuming complete independence among the versions, the model overlooked application scenarios where inter-version communication or result integration is necessary. This assumption may restrict the applicability of their approach to real-world cloud systems where task interdependence is critical for correctness and secure access management. Addressing such coherency aspects is essential to extend the reliability model to more complex cloud-based applications. Table 1 illustrates a summary of the literature review. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Research Work** & **Contributions** & **Gaps** \\ \hline
[43] & Demonstrates growth in B2B and & Does not address cloud \\  & B2C cloud adoption. & security or access control. \\ \hline
[44] & Forecasts over 70\% business & Security challenges with \\  & workload will migrate to cloud by & increased cloud adoption \\  & 2025. & not addressed. \\ \hline
[45,46] & Enable convenient storage of & Incapable of computation \\  & encrypted data using DES and & without revealing secret \\  & AES. & key. \\ \hline
[47] & Introduced homomorphic & Limited efficiency and \\  & encryption for computation on & practical implementation \\  & encrypted data. & concerns. \\ \hline
[48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59] & Describes evolution of Fully & Challenges in practical \\  & Homomorphic Encryption (FHE) & deployment of FHE due to \\  & for cloud security. & high overhead. \\ \hline
[60] & ABAC allows flexible access & \\  & control through attribute-based & Lacks detailed encryption \\  & rules. & scheme integration. \\ \hline
[61, 62] & Highlights the necessity of secure & Conventional models lack \\  & access models in growing cloud & access enforcement \\  & environments. & mechanisms. \\ \hline
[63, 64] & Points out the limitations of & \\  & conventional encryption in & Do not enforce user role \\  & enforcing access rights. & privileges securely. \\ \hline
[66] & Proposed Role-Based Encryption & Limited to role mapping; \\  & (RBE) to secure cloud access & lacks dynamic revocation \\  & control. & handling. \\ \hline
[32, 67, 68] & Proposed models address & \\  & nefarious activity but not cloud & No mechanisms for direct \\  & attacks explicitly. & mitigation of attacks. \\ \hline
[69, 70, 71, 72, 73] & RBAC evolution and & Does not support \\  & improvement over time. & encryption-integrated \\  & access control. & access control. \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Summary of literature review.