Cloud computing is web based computing where one of a kind service-such as server, storage and applications are delivered to an organization's computer gadgets via internet and there are central remote servers to keep records and applications. Cloud storage allows user to share information remotely, access it and additionally user share this information with other. So, Data sharing is an essential functionality of cloud storage. Data sharing is now not secured as user totally depends on cloud server for data privacy and data management. So, user prefers to encrypt their information earlier than importing on cloud. In the Key Aggregate Cryptosystem for data sharing, an efficient public key encryption scheme which helps in extensible delegation it means that any subset of cipher text is decryptable by using a fixed size decryption key. The secret key holder can release a fixed size aggregate key for extensible alternatives of cipher text in cloud storage. This paper come out with an overview and find out about cryptographic approach for security and effectively data sharing in cloud storage.
Cloud storage, Data sharing, Key aggregate encryption, Cryptography
