Covert Communication Audio Watermarking Algorithm Based on LSB

An audio information watermarking algorithm in discrete wavelet transform domain is presented. The idea of embedding synchronic signals which use the synchronic signal to search the watermark location is introduced. First, Logistic chaotic map is utilized to generate embedding bits for security signal and synchronic signals. Then, the public speech signal is converted into segments and discrete wavelet transform is performed, and the hiding bit is embedded in the frequency point of discrete wavelet transform (DWT) by replacing Least Significant Bit. The original carrier is not required in watermark recovery. Experimental results show that the stego audio has transparent feature, and the quality of the recovered message is satisfying, the capacity of this algorithm is high and this algorithm is fit for covert communication. This algorithm is robust to many attacks, such as resampling and cropping.