IMPLEMENTASI VIGENERE CIPHER PADA APLIKASI MYPRICHAT END-TO-END ENCRYPTED SMS BERBASIS ANDROID

Abstract

Short Message Service (SMS) technology is a technology that is not foreign to the community. This short message service technology has its own advantages when compared to the instant messanger technology that is widely known today. SMS technology does not require internet networking for the recipient side, so you can be sure the message will always be delivered. This technology can also be used on any type of cellular phone. SMS is still widely used in short text messaging activities, especially those related to personal account authentication, which ensures that messages are received well by the recipient. The development of technology and the ease of obtaining information in this era, people more understand the importance of securing personal information data, including text message communication, especially for very sensitive secret messages that do not have the right to be consumed by unauthorized parties. Because basically the data contained in SMS is plain text. End-to-end encryption (E2EE) is a mechanism whereby message communication can only be accessed by the sender and recipient of the data. Taking advantage of the advantages of SMS as a communication medium and using an end-to-and encryption mechanism, the MyPriChat (My Private Chat) application was built. This application is a mobile application that utilizes SMS technology with additional encryption security features that implement the Vigenere Cipher algorithm. This application is built on an Android-based operating system. To use the MyPriChat SMS encryption application, that is by installing it on both the sending and receiving users' mobile phones. At the testing stage, MyPriChat SMS encryption application has been able to run on emulators and mobile phones well. This application is expected to provide an option in communicating, being an application that provides text message communication services, and also being able to secure sent text messages.