A review on Data sharing in cloud storage with key-aggregate cryptosystem

Abstract

The encryption and decryption keys may be different for different set of data. Only those set of decryption keys are shared that the selected data can be decrypted. Here a public-key cryptosystems which generate a ciphertext which is of constant size. So that to transfer the decryption rules for number of ciphertext. The difference is one can collect a set of secret keys and make them as small size as a single key with holding the same ability of all the keys that are formed in a group. This compact aggregate key can be efficiently sent to others or to be stored in a smart card with little secure storage.