Audio Secret Sharing (ASS) scheme is a special type of secret sharing scheme that embeds the binary secrets by using harmonic sound or music called as the cover sound. In ASS scheme, people can decode concealed message by the human “ears”. Desmedt et al. first introduced the (2, 2) ASS scheme with one cover sound and then generalized (2, n) ASS scheme with élog2nù different pieces of cover sounds from the basic (2, 2) ASS scheme. However, more cover sounds will cause the human hearing system overburden, and it may be difficult for people to distinguish the secret bit correctly. Thus, their scheme is not practical when n is large. In this paper, we delicately introduce the technique of time division to construct two new (2, n) ASS schemes with only one cover sound. To try the acoustic result, we implement these two proposed (2, n) ASS schemes for small n by using the wave-type cover sound and obtain near expected result.
