Paper Details

The capability of selectively sharing encrypted data with different users via public cloud storage may greatlyease security concerns over inadvertent data leaks in the cloud. A key challenge to designing such encryption schemeslies in the efficient management of encryption keys. The desired flexibility of sharing any group of selected documentswith any group of users demands different encryption keys to be used for different documents. However, this also impliesthe necessity of securely distributing to users a large number of keys for both encryption and search, and those users willhave to securely store the received keys, and submit an equally large number of keyword trapdoors to the cloud in orderto perform search over the shared data. The implied need for secure communication, storage, and complexity clearlyrenders the approach impractical. In this paper, we address this practical problem, which is largely neglected in theliterature, by proposing the novel concept of keyaggregate searchable encryption (KASE) and instantiating the conceptthrough a concrete KASE scheme, in which a data owner only needs to distribute a single key to a user for sharing alarge number of documents, and the user only needs to submit a single trapdoor to the cloud for querying the shareddocuments. The security analysis and performance evaluation both confirm that our proposed schemes are provablysecure and practically efficient.

Kelji Divyashree, Waghmode Manisha, Kharat Pallavi, Mane Rani, Sinkar Y. D, “Key-Aggregate Searchable Encryption for Group Data Sharing via Cloud Storage”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 3, Issue 4, pp. 54-58, April 2016.