1. Department of Mathematics, Agra College; Dr. B. R. A. University; Agra 282002 Uttar Pradesh India
2. Center of Excellence in Information Assurance; King Saud University; Riyadh Kingdom of Saudi Arabia
3. School of Computer Science and Engineering; Hunan University of Science and Technology; Xiangtan 411201 China
4. Department of Computer Science and Engineering, Xiamen Institute of Technology; Huaqiao University; Xiamen 361021 China