Modified Playfair for Text File Encryption and Meticulous Decryption with Arbitrary Fillers by Septenary Quadrate Pattern. - N. Sugirtham; R. Sherine Jenny; B. Thiyaneswaran; S. Kumarganesh; C. Venkatesan; K. Martin Sagayam 001; Lam Dang; Linh Dinh; Hien Dang 001 (Int. J. Networked Distributed Comput., 2024)