Mobile-Based Learning Application for Enhancing Understanding of Cipher Feedback Algorithms

At the Information Technology Study Program of UniversitasAhmad Dahlan, Yogyakarta, cryptography is a core subject in the computer security course.Due to limited lecture time, cryptographic algorithms such as Cipher Feedback cannot be discussed in depth.This research aims to develop an Android application focused on the Cipher Feedback algorithm.The development process involves collecting data from Androidusing students, literature study, observing cryptographic programs, and designing and implementing the application using Kotlin.The application is tested using Black Box Testing and the System Usability Scale to ensure its functionality.The results are expected to help students understand encryption and decryption using the Cipher Feedback algorithm.