Ely Kurniawan, DwiSaleh, Muhammad Ismail2023-01-092023-01-092017-06-02https://repository.polibatam.ac.id/xmlui/handle/123456789/635Current technological developments enable people to communicate and can exchange information remotely. Along with that will the confidentiality of interchangeable information that is increasing. Therefore, developed a branch of science that learn about the ways of securing data or better known as cryptography. The vigenere cipher algorithm belongs to classical cryptography that has a symmetric key (there is only one key) that is used to encrypt or. This application is done cryptography on the text of the capital letters, the results of this study is an android-based applications that can send a message that has been encrypted using vigenere cipher algorithm, so the confidentiality of this message can be gated.Teknik InformatikaInformatikaComputer Sciences, Knowledge, Systems (Ilmu Komputer, Pengetahuan, Sistem)Computer Science (Ilmu Komputer)Computer Programming (Pemrograman Komputer)Thesis