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Journal : Faktor Exacta

Implementasi Algoritma AES dan Algoritma XOR pada Aplikasi Enkripsi dan Dekripsi Teks Berbasis Android Resti Amalia; perani rosyani
Faktor Exacta Vol 11, No 4 (2018)
Publisher : LPPM

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (842.183 KB) | DOI: 10.30998/faktorexacta.v11i4.2878

Abstract

Kriptografi banyak digunakan untuk menjaga aspek keamanan informasi. Pada penelitian ini penulis mengkombinasikan dua kriptografi modern dengan tujuan untuk memperkuat keamanan pengiriman pesan. Untuk kriptografi modern pertama, penulis memilih algoritma XOR dikarenakan mudah diimplementasikan dan tidak sulit secara komputasional. Untuk kriptografi modern kedua, penulis memilih algoritma AES dikarenakan proses algoritma ini cepat dan juga kuat. Proses pengamanan pesan diawali dengan proses enkripsi plainteks menggunakan algoritma XOR untuk menghasilkan cipherteks pertama. Selanjutnya cipherteks dienkripsi lagi dengan algoritma AES sehingga menghasilka cipherteks akhir. Sedangkan untuk proses dekripsi, tahap awal cipherteks didekripsi dengan algoritma AES untuk mendapatkan cipherteks. Kemudian cipherteks didekripsi lagi dengan algoritma XOR untuk menghasilkan plainteks kembali. Hasil dari penelitian ini menunjukkan bahwa pengiriman pesan berjalan 100%  antaran plaintext ke chipertext dan kembali lagi ke plaintext  dengan selisih waktu enkripsi dan dekripsi yaitu 0,13 dan 0,9 detik.
Perancangan Aplikasi Perbaikan Citra Digital Pada Hasil Screenshot Dengan Menggunakan Metode Multiscale Retinex dan Median Filter Noga Adi Putra; Resti Amalia
Faktor Exacta Vol 15, No 3 (2022)
Publisher : LPPM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30998/faktorexacta.v15i3.13706

Abstract

Advances in technology today cannot be kept away from people's lives, because basically technology is built to provide convenience to the community. One example is in the field of digital images, digital images are a representation of the light intensity function in a discrete field in a two-dimensional plane, digital images can also be a source of information other than text, sound and video. However, sometimes the image can also experience a decrease in quality caused by noise, too contrasting colors, blurring, and so on. A distorted image is usually caused by poor image capture, poor lighting, low pixel resolution on the camera, and poor image capture capabilities. This is what underlies the improvement in digital images, digital image quality improvements can be done by various methods, one of which is the Multiscale Retinex and Median Filter methods. The advantages of the Multiscale Retinex method are that it can increase the brightness and color of digital images, especially those that tend to be dark, and the Median Filter method can reduce the disturbance that often occurs in digital images, namely noise. With the two methods used to improve the image, a digital image will look better with a degree and level of color that tends to be evenly distributed. The process begins by entering the test image with *.jpg file format into the program then processed by the Multiscale Retinex and Median Filter methods, then the initial image can be compared with the resulting image using a histogram. From the research that the author did, it resulted in a digital image processing application that can improve brightness and reduce noise in digital images.