Group data searching and sharing using key aggregate cryptosystem

Sharing encrypted data with different users gained great attention in the cloud environment. There have some security issues like data leaks during data sharing, key management of shared data etc. In our project we developed a system which enables secure data sharing in the group of users as well as efficient key management. In our proposed system we used public key cryptography for securely storing and sharing data in cloud. We have created secure constant cipher text which is impartial of data size. It is possible to share data and to give authorized rights for decryption of any set of cipher text. Along with the encrypted data a searchable index is generated to provide search over the encrypted data. The data owner can share subset of files with other users by authorizing them an access rights and constant size of aggregate key. By doing this we are confidential about other outside files as those files cannot be decrypted using the given key. As per access rights search can be applied over restricted data set. Search can also be applied for synonym words. System performance and efficient index generation are the key aspect of our project. Experimental results show that security & efficiency is greatly improved with our proposed scheme.