Secure Access Control using Ciphertext Policy Attribute-based Encryption with Performance Optimization in Cloud Computing

Cipher text-Policy Attribute-Based Encryption is an access control technique widely used in cloud computing for enforcing data access policies based on attributes. However, existing Cipher text-Policy Attribute-Based Encryption schemes suffer from an issue of user’s privacy leakage and increasing cipher text size as the number of attributes in the access policy grows, leading to computational overheads and security vulnerabilities. In this research, we propose a modified Cipher text-Policy Attribute-Based Encryption scheme that addresses both privacy preservation and the problem of increasing cipher text size. Our system achieves a significant reduction in cipher text size, regardless of the number of user-given attributes, thereby ensuring efficiency and enhancing data privacy. We accomplish this by implementing an access policy hiding mechanism that conceals the attribute location and adapting OptiSize Text to eliminates redundant text in input files. Experimental results demonstrate the effectiveness of our proposed system in overcoming challenges related to data privacy and computational overheads. By significantly reducing encryption time and cipher text size, our scheme improves efficiency and enhances the security of cloud computing applications.