A Novel Technique for Data Hiding in Audio Carrier by Using Sample Comparison in DWT Domain

Steganography has proven to be one of the practical ways of securing data. It is a new kind of secret communication used mainly to hide secret data inside other innocent digital mediums. Steganographic algorithms can be characterized by a number of defining properties like Transparency, Capacity, Robustness. We have presented a high capacity and high stego signal quality audio steganography scheme based on samples comparison in DWT domain where selected coefficient of a segment value is change by a threshold value depending upon the embedding cipher text bit. The strength of our algorithm is depend on the segment size and their strength are enabled the algorithm to achieve very high embedding capacity for different data type that can reach up to 25% from the input audio file size with lest of 35 dB SNR for the output stego signal.