In order to improve the efficiency of attribute based encryption, according to the work of Li etal. [17] , a new technique is adopted to implement the revocation of attribute-based encryption. Based on the work of Green etal.[16], a ciphertext attribute based encryption (CP-ABE) scheme with outsourced revocation and decryption simultaneously is proposed. After outsourcing complex computation in...

Cloud computing plays important role in the development of IT industry. It can help a small organization to headway their business. An organization can progress from small scale industry to large scale industry. “Cloud” basically internet based data, network, resource storage. Meanwhile security, integrity, confidentiality requirement need must be achieve by cloud implementation. Attribute base...

Attribute-based encryption (ABE) can be used for implementing fine-grained data sharing in cloud computing. However, most of the existing ABE schemes cannot realize attribute extension and provable security simultaneously. In this paper, we propose a fine-grained attribute-based data sharing system based on a hybrid encryption mechanism. A rigorous security proof indicates that the proposed sch...

We present a new technique to realize attribute-based encryption (ABE) schemes secure in the standard model against chosen-ciphertext attacks (CCA-secure). Our approach is to extend certain concrete chosen-plaintext secure (CPA-secure) ABE schemes to achieve more efficient constructions than the known generic constructions of CCA-secure ABE schemes. We restrict ourselves to the construction of ...