SHARMA, R.; SHARMA, R.; SINGH, H. Classical Encryption Techniques. INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY, [S. l.], v. 3, n. 1, p. 84–90, 2012. DOI: 10.24297/ijct.v3i1b.2745. Disponível em: https://rajpub.com/index.php/ijct/article/view/2745. Acesso em: 5 may. 2024.