Proper

Abstract

Cipher text-Policy Attribute-based cryptography (CP-ABE) is additionally a promising technique for access management of encrypted information. Information access management is Associate in Nursing economical because of ensure the data security inside the cloud. It wants a trustworthy authority manages all the attributes and distributes keys inside the system. In cloud storage systems, there are a unit multiple authorities co-exist and each authority is during a position to issue attributes severally. However, thanks to data outsourcing and untrusted cloud servers, the information access management becomes a troublesome issue in cloud storage systems. Existing access management schemes do not appear to be to any extent further applicable to cloud storage systems, as a results of they either manufacture multiple encrypted copies of identical information or need a terribly dependable cloud server. However, existing CP-ABE schemes can't be directly applied to the access management for multi-authority cloud storage systems, because of the shortcoming of secret writing and revocation.