SECURE DATA SHARING IN PUBLIC CLOUD

Abstract

As the current world become digital, therefore large amount of digital data needs to handle. For handling
large amount of data there is need of cloud, as cloud provides large amount of storage and computing capacity. Public
cloud is very efficient but security is major problem. Security issue can be solved by using mediated certificateless public
key encryption (mCL-PKE). Public cloud involves mainly Key escrow problem and certificate revocation problem, both
problems are solved by the mCL-PKE plan. The mCL-PKE scheme can be use for secure data sharing and it does not use
pairing operation. Current schemes are expensive due to pairing and require maintaining certificate, which requires
more memory and there is chances of attacks. In the mCL-PKE cloud act as key generation centre, generates respective
public keys. Data owner encrypts the data using cloud generated public key and cloud then partially decrypts data. Then
user fully decrypts data. This scheme fully secures the data from third party as cloud also not able to reveal the
information. In mCL-PKE scheme fine grained data access control achieved by addition of new thing. In this data owner
divides user in the form of group and single key to each user group. This reduces number of keys required to maintain,
produced as well as data confidentiality is achieved.