A Novel CDMA-Based Secret Message Multiplexing Scheme by Image Data Hiding

Abstract

In this paper, based on the concept of Code Division Multiple Access (CDMA), we propose an innovative secret message multiplexing scheme by digital image data hiding. Multiple secret messages distributed for several participants are encoded into a CDMA codeword through CDMA multiplexing and then embedded into a grayscale image. At the receiving side, each intended recipient will be assigned a distinct spreading code as the secret key for data extraction. In this way, even the authorized user can only extract his or her own secret message using an exclusive secret key and has no knowledge about other user’s secret. This characteristic helps to ensure data security. Experimental results demonstrate that the scheme is also resistant to Gaussian noise attack, salt-and-pepper noise attack, and cropping attacks. Those merits sustain the feasibility of the proposed scheme.