Résumé: With technological advancements and increasing globalization, cloud computing has emerged as one of the most favoured environments for managing and maintaining data, information, and services worldwide. However, this widespread use of cloud computing necessitates addressing various security challenges and implementing adequate provisions for ensuring data confidentiality and privacy. This paper proposes a modified model to address the above challenges. An improved access control system utilizing attribute-based encryption (ABE) has been proposed for secure cloud access. In this system, the message is broadcasted by the owner, and only precise users possessing definite attributes and constraints are authorized to access shared data. The encryption is carried out on the basis of attributes of the users, and each user's secret share is generated based on their given identity information. The distributed hash table (DHT) is used to distribute ciphertext share and decryption key. The authorized users can receive the disseminated ciphertext only by utilizing their secret shares and the required attributes. The proposed model has been experimentally evaluated and compared with existing state-of-the-art systems, demonstrating its effectiveness and superiority. Additionally, the model incorporates extra features such as a time limit for data availability, biometrics-based identity verification, and resistance to various attacks.

Langue: Anglais