Pengembangan Aplikasi Mobile Kriptografi untuk Enkripsi dan Dekripsi Teks

AHMAD YUSUF AL-HAFIZ; ANGGI FERITA OKTAVIANI; AYU AMELIA PERTIWI; AZHARA AMELIA H; DESNI PARAMITHA PURBA; LENI KARMILA DAULAY; SABRINA AKVA; SARAH PUTRI SYAIFULLAH; YOHANA LORINEZ S

Authors

AHMAD YUSUF AL-HAFIZ Universitas Negeri Medan
ANGGI FERITA OKTAVIANI
AYU AMELIA PERTIWI
AZHARA AMELIA H
DESNI PARAMITHA PURBA
LENI KARMILA DAULAY
SABRINA AKVA
SARAH PUTRI SYAIFULLAH
YOHANA LORINEZ S

Keywords:

Kriptografi, Enkripsi, Deskripsi, Caesar Cipher, Vigenere Cipher, AES, Android

Abstract

Advances in information technology require data security systems that are capable of protecting personal information from threats of misuse and leakage. Cryptography is an important solution in maintaining the confidentiality and authenticity of data through the processes of encryption and decryption. This study aims to develop an Android-based mobile application capable of encrypting and decrypting text using three cryptographic algorithms, namely Caesar Cipher, Vigenere Cipher, and Advanced Encryption Standard (AES). The application was developed using Android Studio with the Java programming language and implemented a by-feature architecture approach so that each algorithm function is separate and easy to manage. Testing was conducted on texts of varying lengths and complexities to measure the speed and accuracy of the encryption and decryption processes. The test results showed that Caesar and Vigenere had execution times of less than 100 milliseconds for short texts, while AES provided a higher level of security with slightly longer processing times. The application also features an activity history and a simple, intuitive user interface. With a combination of classic and modern algorithms, this system can be used as an educational tool for learning cryptography concepts as well as a lightweight data security tool. The results of this research are expected to increase user awareness of the importance of protecting digital information on mobile devices.

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