On the implementation of (2, n) audio cryptography schemes without computing devices

Aiming at implementations, we propose two 2-out-of-n audio cryptography schemes that do not need a computing device. In our schemes, we directly construct n sounds to embed secrets. For perceiving the embedded secrets, we can simultaneously play any two of the n shares. While doing this, we do not have to synchronize precisely. Particularly, the value n is unlimited and it is independent of both the perceiving contrast and band-width. The contrast of our scheme is superior to others. Since we do not need expensive computing devices, the cost of our scheme is also lower.