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<p style="text-align: justify;">In this paper, we consider the operation of matrix in Max-plus Algebra to construct a key public to encrypt and decrypt arabic document. Matrix operation in max-plus algebra is slight different with matrix operation in classical. In this paper, we also use a modular 37 to translate it into arabic text (arabic letter with number and special character).</p>

This research is an application of Hill Cipher cryptographic techniques in the process of encoding messages in the form of Arabic text. Hill Cipher is a classic cryptographic algorithm that uses modulo matrix and arithmetic in its application. The Arabic text used in the Hill Cipher cryptographic technique includes hijaiyyah letters ا, ب, , ي, أ, إ, ؤ, ئ, ى, ة, space , ., ،, ؟, !, and Arabic numbers 0, 1, 9, so the modulo used is                    . This study discusses the steps in encrypting messages with examples of their application in securing Arabic text documents.