Hermansa, Rusydi Umar, and Anton Yudhana. “Implementation of Playfair Cipher and Least Significant Bit Algorithms in Digital Imagery”. Jurnal RESTI (Rekayasa Sistem Dan Teknologi Informasi), Vol. 4, no. 3, June 2020, pp. 454 -61, doi:10.29207/resti.v4i3.1877.