Wijaya, B. A., A. J. . . Manalu, B. A. . . Tarigan, and L. S. . . Silitonga. “Steganography Text Message Using LSB and DCT Methods”. Jurnal Mantik, vol. 5, no. 3, Nov. 2021, pp. 1825-32, https://iocscience.org/ejournal/index.php/mantik/article/view/1767.