SYA’DIYAH, Z.; SALAMAH, N.; ALFIANI, F. ALGORITHM DESIGN OF ELGAMAL MAX-PLUS ALGEBRA FOR LETTER AND NUMBER CRYPTOGRAPHY WITH UNI-CUSTOM CIPHERTEXT. BAREKENG: Jurnal Ilmu Matematika dan Terapan, v. 20, n. 4, p. 3185-3196, 24 ago. 2026.