Ndruru, Eferoni
Fakultas Ilmu Komputer, Universitas Brawijaya

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Pengamanan Citra Digital Berdasarkan Modifikasi Algoritma RC4 Zebua, Taronisokhi; Ndruru, Eferoni
Jurnal Teknologi Informasi dan Ilmu Komputer Vol 4, No 4: Desember 2017
Publisher : Fakultas Ilmu Komputer, Universitas Brawijaya

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Abstract

AbstrakCitra digital yang bersifat pribadi dan rahasia sangat rentang terhadap penyadapan oleh pihak-pihak lain, terutama bila citra tersebut didistribusikan melalui internet. Tindakan penyadapan dan penyalahgunaan terhadap citra yang sifatnya rahasia tentu saja dapat merugikan pihak pemilik citra. Salah satu teknik untuk meminimalkan tindakan tersebut di atas adalah pemanfaatan teknik kriptografi. Teknik kriptografi dapat mengamankan citra digital dengan cara modifikasi nilai-nilai pixel citra sehingga citra yang dihasilkan berbeda dengan citra asli. Algoritma RC4 dapat digunakan sebagai salah satu algoritma dalam mewujudkan tujuan teknik kriptografi. Namun algoritma ini memiliki kelemahan di mana pemecahan algoritma ini dengan know plaintext attack atau know ciphertext only dapat dilakukan dengan mudah. Penelitian ini menguraikan pengamanan citra digital berdasarkan modifikasi algoritma RC4. Modifikasi yang dilakukan adalah menambahkan sebuah blok intial vector pada proses enkripsi maupun dekripsi serta melakukan pemindahan sejumlah bit pada posisi tertentu. Hasil penelitian ini adalah citra digital dengan nilai-nilai pixel yang jauh berbeda dengan nilai pixel aslinya dengan tujuan dapat mempersulit pihak lain dalam memanipulasi citra rahasia.Kata kunci: kriptografi, citra, algoritma, RC4, cipher aliran.AbstractDigital images of a private and confidential verry extend to wiretapping by other parties, especially when the image is distributed over the internet. The tapping or misuse of the confidential private image of course, harm the image owner. One technique to minimize the above measures is the utilization of cryptographic techniques. Cryptography techniques can secure digital images by modifying the image pixel values so that the resulting image is different from the original image. RC4 algorithm can be used in realizing the purpose of cryptographic technique. But this algorithm has a weakness where the solving of this algorithm with know plaintext attack or know ciphertext only can be done easily. This research describes the security of digital images based on RC4 algorithm modification. The modification is to add a initial vector block in the process of encryption and decryption and shift a number of bits in a certain position. The results of this research is a digital image with pixel values that are much different from the original pixel value to make it difficult for others in manipulating the secret image.Keywords: cryptography, image, algorithm, RC4, stream cipher.
Implementasi Data Mining Dalam Pengelompokan Jurusan yang Diminati Siswa SMK Negeri 1 Lolowa'u menggunakan Metode Clustering Ndruru, Eferoni; Limbong, Riswan
MEANS (Media Informasi Analisa dan Sistem) Volume 3 Nomor 2
Publisher : UNIKA Santo Thomas Medan

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Abstract

Education is a very important thing and will continue to grow as time goes by, in Indonesia it is rather difficult to keep up with that development. In an effort to provide quality education in a school institution, it is necessary to attract students in choosing the best department in the school. The purpose of this student's specialization in the selection of majors is very important in supporting the knowledge of higher education and the enthusiasm of these students in developing knowledge in the chosen field, such as problems that have occurred in Lolowa'u N 1 Vocational School where students choose majors in accordance with people's encouragement others without any interest in the department, resulting in a decrease in enthusiasm for learning. Therefore, the grouping of students 'data in each department is done and grouped by value, because from this value can be seen the students' enthusiasm for learning. . Data mining is one way to convert data into useful information and can produce new knowledge. The method used is clustering, this clustering method is a method of grouping data. The results obtained in this study are the results of grouping data based on values and can be determined by interested students.