Published Paper Details:

Cloud computing is information technology paradigm or model in which network of remote servers are hosted on internet to store maintain and process data rather than a local server (PC). Cloud computing provide different services, facility such as application, server, cloud storage. Nowadays we can see rise of cloud storage as it allows to store large documents, it also allows consumers to use applications without installation and access their files as any computer with internet access. That means it reduces cost of installation and storage. Cloud storage plays an important role that is data sharing. But when it comes to privacy and security, cloud storage is not secure for data sharing. So users prefer to encrypt data before uploading on cloud. Key aggregate cryptosystem (KAC) is public key encryption scheme which supports flexible delegation. Secret key holder produces aggregate key for flexible choices of cipher texts. This aggregate key holds the power of all aggregated key. It is compact but powerful key. This paper demonstrates cryptography techniques for scalable data sharing in cloud storage using this constant size aggregate key.