Prajwalasimha S. N., Vaani K., Sahana G. C. “Handwritten Signature Image Fortification: An Implementation Based on Modified Blowfish Algorithm With Duffing Chaotic Substitution”. International Journal of Advanced Science and Technology, Vol. 29, no. 04, June 2020, pp. 8626 -, http://sersc.org/journals/index.php/IJAST/article/view/30600.