With the widely application of JPEG image, we studied the exact authentication scheme of JPEG image in which select the embedding area by modifying quantification table, tradeoff between watermark embedding capacity and image quality.

• 针对使用标准量化表的JPEG图像文件认证算法嵌入容量小、安全性不高的不足，本文使用调整量化表的方法折中水印图像质量和嵌入容量之间的矛盾，使得设计的认证算法在图像保真度和安全性方面都有一定提高。