[1]
“Watermarking Competency Certificates with Value Images Using the Descrete Cosine Transform (DCT) Method”, PASCAL, vol. 2, no. 01, pp. 33–37, Oct. 2024, Accessed: Dec. 13, 2025. [Online]. Available: https://jurnal.devitara.or.id/index.php/komputer/article/view/117