A data hiding method is proposed, which has capabilities of data authentication and recovery of the buyer's facial image for security of authentication in e-commence applications. The method embeds information of the e-commence transaction and certain authentication signals of the image and the information of the face region in the image into the higher-frequency coefficients of the DCT of the non-face image portion by using an adaptive JPEG quantization table. When the system receives the buyer's image, the embedded data can be extracted to judge the truthfulness of both the transmitted image and the e-commence transaction. When the face region in the image was tempered with, the original face image can be recovered by using the extracted information. Experimental results show the feasibility of the proposed method.
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