Ciphertext-policy Attribute-based Encryption

Résumé: From an information security perspective storing and sharing sensitive data on the cloud can arise a number of questions about the various threats facing the cloud, including user privacy and the integrity of stored data. The objective of this thesis is to implement solutions to these two problems within the framework we proposed. To do this, we have developed two methods, each of which is the subject of a contribution. The first contribution provides an access control model based on the CP ABE attribute-based encryption method, which allows data owners to ensure data security and provide users with fine access to data using defined policies and constraints. The second a digital signature, which is one of the solutions that can be used to preserve the confidentiality of personal data. The experimental results of our solution show that both methods are effective in safely managing data stored in the cloud and ensuring user confidentiality. Keywords: Cloud computing security, confidentiality, data integrity, CP-ABE encryption, Digital signature, Access control, Hashing.

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