RB, D., and P. D. G. M. Someswar. “Time-Based Proxy Re-Encryption Scheme for Secure Data Sharing in a Cloud Environment”. International Journal of Emerging Trends in Science and Technology, Vol. 2, no. 01, Jan. 2015, http://igmpublication.org/ijetst.in/index.php/ijetst/article/view/456.