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Journal of Information Science and Engineering, Vol.19 No.4, pp.605-614 (July 2003)

New Audio Secret Sharing Schemes With Time Division Technique*

Chen-Chi Lin, Chi-Sung Laih and Ching-Nung Yang+
Cryptography and Network Security Laboratory
Department of Electrical Engineering
National Cheng Kung University
Tainan, 701 Taiwan
+Department of Computer Science and Information Engineering
National Dong Hwa University
Hualien, 974 Taiwan

An Audio Secret Sharing (ASS) scheme is a special type of secret sharing scheme [3], which the shares of embedded messages use music as cover sound. Desmedt et al. firstly introduced the (2, 2) ASS scheme with one cover sound and also the generalized (2, n) ASS scheme with élog2nù different cover sounds. No only will more cover sounds overburden the human hearing system but also may become difficult for people to distinguish the secret bit correctly. Thus, their scheme is not practical when n is large. In this paper, we will propose two new (2, n) ASS schemes, which carefully employ the technique of time division with only one cover sound. Comparing with the first scheme, the second scheme has the advantage of flexible improvement in relative contrast as needed. To test the acoustic result, we implemented these two proposed (2, n) ASS schemes for small n using one wave-type cover sound and then obtained near expected results.

Keywords: audio secret sharing (ASS) scheme, secret sharing schemes, threshold schemes, key protection, key management

Full Text (全文檔) Retrieve PDF document (200307_04.pdf)

Received March 25, 2002; accepted December 16, 2002.
Communicated by Shiuh-Pyng Shieh.
*The preliminary version of this paper has been presented at Information Security Conference 2002, Taichung, Taiwan, May 2002.