Penggabungan Algoritma Hill Cipher dan ElGamal untuk Mengamankan Pesan teks

Hill Cipher is a one of the symmetric key cryptography algorithm that using an invertible matrix with order n×n as to encrypt and decrypt plaintext. Meanwhile, ElGamal other asymmetric use complexity discrete logarithms in encryption decryption process. In this study, authors are interest combine algorithms secure text messages. The author converts plaintext table ASCII 256. Then which results ciphertext from messages key. processing determine will be used process so original obtained. obtained combination can done it well.