With the rapid growth of cloud computing, it becomes important to ensure security, privacy and efficiency when it comes to data exchange. In this framework we proposed enhanced Key Policy Attribute-Based Encryption (TB-KP-ABE) with time bound keys which provides dynamic user revocation without the need of complete key redistribution or data re-encryption which significantly improves the adaptability of ABE. Proposed a framework integrates TB-KP-ABE for encryption and Discrete Cosine Transform (DCT) for image compression, which can provide both cost-efficient storage and swift time bound access revocation in untrusted cloud environments. Framework provides two layers of security at first layer data is divided into chunks and in second layer data is encrypted and saved over cloud. Framework provides fine-grained access control based on users attributes for secure data exchange. Usage of DCT minimizes data storage overhead and cost by compressing data which enhances storage efficiency without significantly compromising data quality. Additionally our framework provide time based access revocation which is crucial for minimizing risks associated with unauthorized access. Evaluated result and analysis depicted that the presented framework can minimize storage cost by 50% and enhance the security of data exchange in untrusted cloud environments.
Naikwade et al. (2026) studied this question.