Hierarchical Attribute based Encryption in Cloud Environment

In the IT industry cloud computing is considered as one of the most important paradigms. In cloud computing we have to store our data at cloud providers place. While doing data storage and management cloud security and privacy on outsource data increasing these days. Attribute Based Encryption (ABE) techniques came into existence for secure access control like Ciphertext-Policy Attribute-Based Encryption (CP-ABE) and Key-Policy Attribute-Based Encryption (KP-ABE). These techniques suffer from problems in implementing flexible and scalable access control mechanisms. This paper provides Hierarchical Attribute-Based Solution in cloud environment. On outsourced data it provides both efficient and flexible access control in cloud computing. In addition it provides multiple value assignment for expiration time to deal with features like user revocation