A high embedding efficiency speech information hiding approach

This work proposes a method of embedding digital watermarks into audio signals in the time domain. The proposed algorithm exploits differential average-of-absolute-amplitude relations within each group of audio samples to represent one-bit information. Embedding of confidential data in the least significant bit of an audio is still an attractive method of steganography in the time domain. Security of embedded watermarks is enhanced by adopting unequal section lengths determined by a secret key. Embedding efficiency, defined as the number of embeddable bits per one change in the cover medium, is a good criterion for concurrent evaluation of capacity and security. Analytical and experimental results demonstrated that the proposed method provides higher embedding efficiency than other audio schemes in the time domain.