IMPLEMENTASI FEISTEL BLOCK CIPHER DALAM ENKRIPSI FILE BERBENTUK TEKS

Salah satu cara mengamankan file digital yang dikirimkan melalui jaringan komputer adalah kriptografi. Kriptografi melakukan pengamanan terhadap file digital yang dikirimkan dengan melakukan pengacakan informasi asli (plaintext) menggunakan kunci (key). Pada penelitian ini akan diimplementasikan salah satu metode dalam melakukan enkripsi terhadap file berbentuk Teks (txt, pdf, docx dan rtf) dengan maksimal input file digital berukuran 80 MB menggunakan Feistel Block Cipher dengan metode 3DES. Proses penyandian (enkripsi) algoritma DES diproses sebanyak 3 kali menggunakan 3 kunci dengan total kunci yang dibangkitkan menjadi 168 bit. Ketiga kunci yang digunakan dapat bersifat saling bebas, atau hanya 2 kunci saja yang saling bebas tergantung penggunaan yang dibutuhkan. Hasil pengujian menunjukkan ukuran file berpengaruh pada waktu yang dibutuhkan dalam proses enkripsi maupun dekripsi, selain itu proses yang berjalan pada sistem operasi juga mempengaruhi waktu pengenkripsian suatu file. Tabel hasil uji coba menunjukkan bahwa waktu yang dibutuhkan dalam proses enkripsi tidak jauh berbeda dengan waktu yang dibutuhkan dalam proses dekripsi pada file yang sama, yaitu memiliki selisih sebesar 0.03% dimana proses dekripsi lebih cepat daripada proses enkripsi

Optic Disc and Macula Localization from Retinal Optical Coherence Tomography and Fundus Image

This research used images from Optical Coherence Tomography (OCT) examination as well as fundus images to localize the optical disc and macular layer of retina. The researchers utilized the OCT and fundus image to interpret the distance between macular center and optic disc in the image. The distance will express the area of macula that can be employed for further research. This distance could recognize the thickness of macula parameters diameter that will be used in localizing process of optic disc and macula. The parameters are the circle radius, the size of window’s filter, the constant value and the size of optic disc element structure as well as the size of macula. The results of this study are expected to improve the accuracy of macula detection that experience the edema

E-Marketing Application Design For Improving SME’s Competitiveness In Lombok Island - Indonesia: Proceeding of ISCLO (International Seminar and Conference on Learning Organization, October 26th 2016

The success of Small and Medium Enterprises (SMEs) is the availability of a clear market for the products. Meanwhile, the fundamental weaknesses faced by SMEs in marketing are low market orientation, weakness in a complex and sharp competition and inadequate marketing infrastructure. Faced with an increasingly open market mechanisms and competitive, market control is prerequisite for improving competitiveness. Therefore, expansion of market access with Web-based Information Technology is now needed as a medium for global communication. One thing that gives a competitive advantage in international trade competition is information technology of electronic marketing or e-marketing. The method used in this research is the conceptual framework and empirical based review of the literature related to information technology, small and medium enterprises, e-commerce and e-marketing.This paper intend to shows the important role of e- marketing for SMEs in Lombok Island - Indonesia and how to develop the model of e-marketing. Keywords. small and medium enterprise; information technology; e-commerce; competitive advantage