Priya S. Birhade, Chaitanya V. Bhirud, Sangam D. Walke, and Jyoti S. Borse. 2016. “Efficient Multi Server Authentication and Hybrid Authentication Method”. International Journal of Computer Engineering in Research Trends 3 (4):165-68. https://www.ijcert.org/index.php/ijcert/article/view/285.