An audio secret sharing system based on fractal encoding

Secrets sharing is an interesting topic and has studied for a period of time. This paper proposed a method to deal with the audio secret sharing based on fractal encoding. The proposed method has negligible constraints on secret audio and shared audios. Using fractal encoding makes the size of the secret reduces 40% in this study and the architecture is simple to practice. The fractal codes were divided into several parts. Through staggered way with least significant bit method, these codes were put in frequency domain of other audios. To rearrange these codes in order is not easy without the idea how they were put in carriers. Different persons can hold different parts of the fractal codes to share this secret audio. In the experiments, two secret audios were used and showed two experimental results. Signal to noise ratio (SNR) is applied as a criterion. The results of experiment showed the secret audios were restored successfully. The best value of SNR in this experiment is 29dB so far. To observe whether this audio has been exploited to hide the fractal codes in frequency and time domain is not easy. In the future, this system could be used for voice controlled locks or one´s last will and testament.