Date of Publication :26th June 2019

Abstract: In this paper, a robust substitution technique has used to implement proposed work of audio steganography. Steganography is an art of science methodology of writing hidden messages such a way that no one apart from the intended reciever knows the presence of the secret message data. This technique resolves the various inherent issues ,after that it increases the data hiding capacity while being also achieve robustness from various intentional as well as unintentional hacking attacks like this it provides privacy to data. The main strength of our algorithm is depend on the segment size and its used to achieve very high embedding capacity for different data type that can reach up to 50% from the input audio file size. Here developing two novel approaches of substitution technique of audio steganography that improves the capacity of cover audio which for embeds additional data The simplest LSB technique simply replaces the LSB in the cover image with the bits from secret information. Further advanced techniques use some criteria to identify the pixels in which LSB(s) can be replaced with the bits of secret information. In DCT based technique insertion of secret information in carrier depends on the DCT coefficients. Any DCT coefficient value above proper threshold is a potential place for insertion of secret information.The proposed methods offers high quality of steganography process in terms of Peak Signal–to-Noise Ratio (PSNR). Only minor changes in the contents of the audio file occur, which is indiscernible to human ears. In addition, several attacks on the sound wave were performed; the results showed that the hidden secret data can be retrieved with minimal distortion. An implementation of both these methods and their performance analysis has been done in this paper

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