Published Paper Details:

Security and access control issues are main obstacles for wide application of cloud computing. To ensure security for data we construct an efficient user revocation CP-ABE scheme through improving the scheme and prove our scheme is secure from chosen plain text attack CPA secure under the selective mod-el. To solve security issue, we embed a certificate into each user’s private key. In this way, each user’s group secret key is different from others and bound to-gether with his private key associated with attributes. To reduce users’ computation burdens, we introduce two cloud service providers named encryption -cloud service provider (E-CSP) and decryption-cloud service provider (D-CSP). The duty of E-CSP is to perform outsourced encryption operation and D-CSP is to perform outsourced decryption operation. We extended the System security by adding One Time Password to the System while downloading the file and to overcome burden of Trusted Authority we Created Multiple Trusted Authorities to handle the requests.