BMP图像的防伪数字水印

近年来，随着数字媒体的大量出现，数字水印作为一种信息安全技术越来越受到人们的关注。目前已经有许多BMP图像的数字水印算法，但是这些算法生成的数字水印图像很容易受到拷贝攻击，所谓拷贝攻击是指敌手将水印从一个作品拷贝到另一个作品的攻击方法。BMP图像的防伪数字水印算法把密码技术和数字水印技术结合起来，其生成的数字水印图像可以克服拷贝攻击。

Defend_false digital watermarking of bitmap picture

In recent years,following the appear of many digital medium, as a technology of information safety, digital watermarking has been to be concerned by more and more people. At present, it exists many algorithms about digital watermarking of bitmap picture, but the digital watermarking pictures which are generated by these algorithms are easy to be exposed to attack ofcopy thatis the way which enemy copies digital watermarking from a production to another one. The algorithm about defend_false digital watermarking of bitmap picture integrates technology of cryptogram with technology of digital watermarking, and the digital watermarking pictures which are generated by the algorithm can overcome attack of copy.