Implement dynamic data masking in Oracle DBMS to protect sensitive information from unauthorized access during queries for a hotel reservation system. Provide a detailed step by step and well detailed answer that addresses the following:

a$)$ Abstract: Provide a concise summary of the project, including the objectives, approach, and key findings.

b$)$ Introduction: Clearly explain the importance of data masking in the context of a hotel reservation system. Discuss the need for protecting sensitive customer information and the potential risks of unauthorized access.

c$)$ Literature Review: Research and summarize the existing literature on dynamic data masking techniques in Oracle DBMS$.$ Compare and contrast different approaches, and highlight the advantages and limitations of each.

d$)$ Methodology: Describe the overall approach and the specific steps taken to implement dynamic data masking. This should include the selection of sensitive data fields, the design and implementation of the masking rules, and the testing and validation of the solution.

e$)$ Design:

i$)$ E$-$R Diagrams: Provide the entity$-$relationship diagrams that represent the structure of the hotel reservation database and the data masking implementation.

ii$)$ Use Case Diagram: Illustrate the key use cases for the data masking functionality, including authorized and unauthorized access scenarios.

iii$)$ Activity Diagram: Model the workflow and the sequence of actions involved in the data masking process.

iv$)$ Class Diagram: Identify the main classes, their attributes, and the relationships between them, as they relate to the data masking implementation.

v$)$ Sequence Diagram: Depict the interactions between the different components and actors involved in the data masking process.

vi$)$ Brand Identity Design: Discuss any branding or visual design considerations that were taken into account for the project.

vii$)$ User Interface Design: Provide screenshots or mockups of the user interface, highlighting the data masking functionality and its integration with the hotel reservation system.

f$)$ Conclusion: Summarize the key findings, the benefits of the implemented data masking solution, and any lessons learned or future improvements that could be made.

g$)$ Working Code: Provide the working code for the dynamic data masking implementation, including explanations of the critical sections and any challenges encountered during the development process and output$/$results