A Survey on Steganography in Audio
Pradeep Kumar Singh, Hitesh Singh, Kriti Saroha · 2009
Audio as a cover mediu m in steganography has its own place due to its bigger size compare to other carrier’s file like (text, image, etc.). So there are more possibilities to hide large amount of data inside audio as a cover. There are also some inherent characteristics in Hu man Auditory System (HAS), which make it great success in field of Steganogarphy. Dig ital contents are easy to be pirated and to be distributed in today’s world. Recently created technology on web increases the rate of data transmission, open new possibilit ies for audio steganography. Digital steganography is based on the fact that artifacts like audio files contain redundant informat ion, so instead of eliminating the redundant information, we replace some of it with other data based on human auditory system. Audio steganography, or information hiding in audio signals, is gaining widespread importance for secure communication of informat ion such as covert battlefield data. On another level, watermarking of audio signals for digital rights management is becoming vital to prevent illegal copying, file sharing, etc. In fact, when co mmunicat ion about highly confidential topics is needed, steganography combined with cryptography would be the most secure way to go. Because the mere existence of an encrypted communication draws attention to it, hiding it in another file ups your security level substantially. In this paper we will take an in-depth look at this technology by introducing the reader to various existent methods of Audio Steganography, its practical applications, what works, what does not, and possible research areas.