Hierarchical attribute based proxy re-encryption access control in cloud computing

Cloud computing is one of the emerging technology of IT industry in recent times. This new technology requires entrust the user's valuable data to the cloud server, since this cloud computing have the major disadvantage over security and privacy to the outsourced data to the server. To overcome this disadvantage several attribute-based encryption (ABE) schemes are reported for the user's data file encryption and also for the access control of the outsourced data in the cloud server; however, implementing of access control policies in attribute-based encryption (ABE) is more complex. The attribute-based encryption (ABE) has two type techniques Ciphertext-Policy Attribute-Based Encryption (CP-ABE) and Key Policy Attribute-Based Encryption (KP-ABE). The CP-ABE is does not support the updating the secret key without the decrypting the encrypted data file In this paper we proposed the proposal of HABE extends to Key Policy Attribute-Based Encryption (KP-ABE), for user revocation and updating user's secret key updating is carried out by Proxy Re-Encryption(PRE) and lazy Re-Encryption.