Key Policy Attribute Based Encryption in Cloud Storage

Abstract

Cloud Computing is the rapid growing technology and enables highly scalable services to be easily consumed over the Internet on an as-needed basis. It is a kind of Internet-based computing that provides shared processing resources and data to computers and other devices. Cloud computing has become a highly demanded service or utility due to the advantages of high computing power, cheap cost of services, high performance, scalability, accessibility as well as availability. Some cloud vendors are experiencing growth rates of 50% per year but being still in a stage of infancy, it has pitfalls that need to be addressed to make cloud computing services more reliable and user friendly. Data sharing is an important functionality in cloud storage. The proposed system provides how to maintain integrity, confidentiality and availability to share data with others. Here described new Attribute Based Encryption cryptosystems which generates encryption, decryption time along with file size. Proposed work explains encryption with Attribute Based encryption then file is spitted into chunks. Hash key is generated for every data chunk which is unique. Secure hash algorithm is used for generation of hash key. For decryption file is searched on cloud, with private key then it is decrypted. Attribute Based encryption along with secure hash algorithm is applied. This proposed work describes analysis of encryption, decryption time calculated with Identity Based encryption and Attribute Based encryption according to file size. It creates hash key for every chunk which is unique. Proposed algorithm gives confidentiality to work as it is a public key encryption algorithm of cryptography. It is also asymmetric i.e. key set is used for data encryption and decryption. Data is stored on cloud means it is available to everyone through Cloud space. Key generated for encryption and decryption is runtime. In this work analysis is there. Encryption and decryption time required by Identity Based Encryption and Attribute Based Encryption is calculated for comparison purpose. Both algorithms user can apply on different file type such as pdf, ppt, doc, mp3, jpg and file size.