Gupta, Prachi, and Manoj Kumar. “Application of Vigenere Cipher to Enhance the Playfair Cipher Security”. International Journal of Psychosocial Rehabilitation 24, no. 8 (October 31, 2020): 15749–15755. Accessed August 22, 2026. https://www.psychosocial.com/index.php/ijpr/article/view/12279.