Cryptography is often considered complex and difficult to learn due to its involvement of intricate and abstract mathematical concepts. The existing media and educational methods currently available do not fully meet the needs for effective and efficient learning in conveying this complex material. Conventional approaches are often insufficiently interactive and engaging for learners, potentially hindering the learning process. On the other hand, Augmented Reality (AR) technology has proven effective as an interactive and accessible learning medium, offering new ways to present complex material visually and dynamically. Therefore, this study aims to develop an Android application that integrates AR technology as an educational tool for cryptography and to evaluate its impact on the general public's understanding of cryptography. This research employs the ADDIE method, a systematic instructional design framework that includes five stages: Analysis, Design, Development, Implementation, and Evaluation. Additionally, the study integrates principles from the Software Development Life Cycle (SDLC) to ensure precise and structured development. Additionally, the study integrates principles from the Software Development Life Cycle (SDLC) to ensure precise and structured development. The research findings indicate that AR can effectively serve as an interactive medium for learning cryptography and significantly enhance users' understanding of the subject. Specifically, t-test results demonstrated a statistically significant increase in cryptography understanding (p < 0.05) for both learners with and without prior knowledge, indicating the media's effectiveness across different educational backgrounds. Moreover, the AR-based cryptography learning system was well-received by the public, with User Acceptance Testing results showing an acceptance rate of over 90% in every aspect tested, highlighting its usability and design quality. © 2025 IEEE.
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