Attribute and Time Based Encrypted Data Access over Cloud

Data access management is an efficient way to make sure the knowledge security within the cloud. However, thanks to knowledge outsourcing and untrusted cloud servers, the information access management becomes a difficult issue in cloud storage systems. Existing access management schemes are not any longer applicable to cloud storage systems, as a result of they either turn out multiple encrypted copies of constant knowledge or need a totally trusty cloud server. Ciphertext-Policy Attribute-based cryptography (CP-ABE) may be a promising technique for access management of encrypted knowledge. It needs a trusty authority manages all the attributes and distributes keys within the system. To guard knowledge confidentially against the honest-but-curious cloud service supplier, varied works are projected to support fine-grained knowledge access management. However, till now, no schemes will support each ne-grained access management and time-sensitive knowledge business enterprise. During this paper, by embedding timed-release cryptography into CP-ABE (Ciphertext-Policy Attribute-based Encryption), we tend to propose a replacement time and attribute factors combined access management on time-sensitive knowledge for public cloud storage.