More on the multimedia data security for e-commerce

We present a watermarking scheme using symmetric and asymmetric cryptography. The scheme provides four essential features, confidentiality, authentication, integrity, and nonrepudiation, which are necessary for secure electronic commerce. To achieve this, the proposed idea consists two fold: one using traditional cryptography and the other using digital watermark that inserts the digital signature into the multimedia data. The advantage of this scheme is that the transmitted data including the encrypted digital data and the digital signature are contained in the same file. Simulation results show that if even a single bit has been changed, or wrong key is used, the received data are regarded as violation of four essential features.