一种基于数字水印的图像完整性与身份验证方法

Image Integrity Verification and Sender's Authentication Technology Based on Watermark

图像在许多的实际应用领域,比如:新闻报道、法庭举证、医学鉴定、记实照相机要求保证图像不被未授权者随意篡改。在某些场合,不仅要求保证图像的完整性,还需要验证图像发送者的身份。该方法综合了数字水印、报文摘要、公钥匙加密等技术,具有以下特性:图像数据与验证数据浑然一体;不但能检测出图像是否被篡改、缩放、剪切,还能定位被篡改象素块的位置;能检测并定位出图像内子块与子块之间的偷换、图像与图像之间的子块偷换、嫁接等。

Image Integrity is very important for many imaging applications, for example, ne ws report, court probe, medical archiving of images, trusted camera and others. In addition, senders authentication is needed on some occasions. The new metho d based on watermark, message digest and public key cryptography technology is p roposed to verify image integrity and senders authentication: any changes of p ixel values and changes in image size due to scaling or cropping as well as bloc k swapping in images or corresponding block swapping between images can be detec ted and located.