Steganography for Data Hiding in Digital Audio Data using Combined Least Significant Bit and 4-Wrap Length Method

Abstract

Steganography process requires two different media, namely messages and cover media with the aim to insert or hide a text message information into the audio media so that in addition to sender and receiver no one knows that there is a secret message. In this study, the message used is text data in “txt” format and the cover is digital audio data in “wav” format. Message insertion is performed by using the Least Significant Bit (LSB) method. In this case, text and audio data need to be converted into 8-bit binary forms. The 4-Wrap Length method is the method proposed to determine the insertion position of the message into the cover to generate the insertion results randomly so that the contents of the message are not easily known. Performance measurement of the steganography results was performed by using MSE (Mean Squared Error) and PSNR (Peak Signal-to-Noise Ratio). This study has used a sample of audio data files that have duration of 10 seconds as a cover and five text messages of different lengths. The study results showed that the longer the text message, the larger the MSE and the smaller the PSNR. It can be concluded that the quality of stego-audio was very depend on the length of the text message.