Penyisipan Pesan Rahasia pada Citra Digital dengan Metode Steganografi dan Algoritma Least Significant Bit (LSB)

Abstract

This study discusses the implementation of the Least Significant Bit (LSB) steganography method to insert secret messages into digital images by adding the Caesar Cipher algorithm as an additional security layer. The secret message is first encrypted using the Caesar Cipher before being embedded into the least significant bit of digital image pixels. This approach ensures that the message is not only visually hidden but also protected in terms of content. The system is developed as a web-based application using HTML, CSS, and JavaScript, enabling users to perform message insertion and extraction directly through a browser without installing additional software. Image quality evaluation is conducted using Mean Squared Error (MSE) and Peak Signal-to-Noise Ratio (PSNR). The experimental results show that the LSB method produces low MSE values and high PSNR values, indicating minimal visual distortion. The combination of LSB steganography and Caesar Cipher encryption proves effective in enhancing information security on digital image media.