Implementasi Algoritma Advanced Encryption Standard (AES) 128 Untuk Enkripsi dan Dekripsi File Dokumen

Abstract

Keamanan data atau informasi adalah hal yang sangat penting bagi pengguna jaringan internet saat ini. Kasus penyadapan akan pesan atau informasi merupakan salah satu hal yang sangat merugikan, dengan adanya kemungkinan terjadinya kejadian ini, maka perlunya peningkatan dalam hal keamanan pertukaran informasi menjadi penting. Pada saat ini, keamanan pertukaran informasi ini perlu mendapatkan perhatian khusus, maka penelitian ini akan membuat suatu implementasi kriptografi algoritma AES-128 untuk enkripsi dan dekripsi data yang berupa file dokumen (PDF, DOC, TXT). Algoritma Advanced Encryption Standard (AES) dipilih karena memiliki suatu tingkat keamanan pertukaran informasi yang cukup bagus, dan pada penelitian ini diuji coba file dokumen untuk melihat kecepatan waktu yang dibutuhkan selama proses enkripsi dan dekripsi.

Analysis Of Voice Data Security Security By Using The Rc4 Algorithm

“…Cryptography is the study of mathematical techniques related to information security aspects such as confidentiality, data integrity, and authentication. maintain message security (Rinaldi Munir, There are various definitions of cryptography, but in essence cryptography is a technique used to ensure the security of data exchange [3].…”

“…First iteration: i = 0, then j = (j + S[i] + K[i] ) mod 8 = (j + S[0] + K[0] ) mod 8 = (0 + 0 + 1 ) mod 8 = 1 Swap S[0] and S[1] to produce an array S: 10010111 Second iteration: i = 1, then j = (j + S[i] + K[i] ) mod 8 = (j + S[1] + K[1] ) mod 8 = (1 + 0 + 7 ) mod 8 = 1 Swap S[1] and S[0] to produce an array S: 00010111 Third iteration: i = 2, then j = (j + S[i] + K[i]) mod 8 = (j + S[2] + K[2] ) mod 8 = (0 + 0 + 1 ) mod 8 = 1 Swap S[2] and S[3] to produce an array S: 00110111 Fourth iteration: i = 3, then j = ( j + S[i] + K[i] ) mod 8 = ( j + S[3] + K[3] ) mod 8 = (1 + 1 + 7 ) mod 8 = 1 Swap S[3] and S[2] to produce an array S: 01100111 Fourth iteration: i = 4, then j = ( j + S[i] + K[i] ) mod 8 = ( j + S[4] + K [4] ) mod 8 = (1 + 0 + 1 ) mod 8 = 0 Swap S[4] and S[3] to produce an array S: 01010111 Fourth iteration: i = 5, then j = ( j + S[i] + K[i] ) mod 8 = ( j + S[5] + K[5] ) mod 8 = (0 + 1 + 7 ) mod 8 = 0 Swap S[5] and S[4] to produce an array S: 01100011 Fourth iteration: i = 6, then j = ( j + S[i] + K[i] ) mod 8 = ( j + S[6] + K[6] ) mod 8 = (0 + 1 + 1 ) mod 8 = 0 Swap S[6] and S[5] to produce an array S: 01100011 Fourth iteration: i = 7, then j = ( j + S[i] + K[i] ) mod 8 = ( j + S[3] + K[3] ) mod 8 = (0 + 1 + 7 ) mod 8 = 0 Swap S[7] and S[6] so as to produce an array S: 01100001 Fourth iteration: i = 8, then j = ( j + S[i] + K[i] ) mod 8 = ( j + S[8] + K[8] ) mod 8 = (0 + 1 + 1 ) mod 8 = 0 Swap S[8] and S[0] to produce an array S: 00110000 After getting the results of the S array from the fourth iteration, the next process is to XOR the pseudo randombyte with plaintext, with the entered plaintext is 10110000. Because the plaintext consists of two characters, two iterations occur.…”

Pengembangan Sistem Informasi Asosiasi Jasa Konstruksi dengan Menerapkan Tanda Tangan Digital

“…Berdasakan panjang kuncinya, ada 3 (tiga) tipe AES, yaitu: AES-128 dengan panjang kunci 128 bit, AES-192 dengan panjang kunci 192 bit, dan AES-256 dengan panjang kunci 256 bit. Panjang kunci akan mempengaruhi jumlah putaran (round) pada proses enkripsi dan dekripsi [16]. Operasi algoritma AES secara garis besar untuk proses enkripsi adalah sebagai berikut [17]:…”

Expert System Diagnosing Diabetes Using the Web-Based Dempster Shafer Method

“…In a previous study in the journal [3] with the title In research related to the application of a webbased expert system to diagnose diabetes with the title expert system diagnosing diabetes using the certainty factor method by taking 3 types of diseases with 8 kinds of symptoms with different weights. [4].…”