Penerapan Kombinasi Algoritma Advanced Encryption Standard (AES) dan Elgamal Dengan Fungsi Secure Hash Algorithm (SHA) Dalam Penyandian File Dokumen

Abstract

Abstract Documents or files are very important data because they are a source of information needed by anyone. The security of documents or files can be secured by cryptographic technique. The purpose of cryptographic is to disguise a message from another others and can only be opened by those who have the right to open the message. In this study, it combines a symmetric algorithm, namely the Advanced Encryption Standard (AES) algorithm and an asymmetric algorithm, namely the Elgamal algorithm with the addition of the SHA-256 hash function as data integrity, where the file will first be encrypted with the Elgamal algorithm then will be hashed with SHA-256 which aims for data integrity. Then the decryption process is carried out with the Elgamal algorithm and will then the be decrypted again by the Advanced Encryption Standard algorithm. The results of the test restore the file as before using the appropriate key and can also test data integrity if the data changes.