摘要： 针对医学数字成像和通信(DICOM)文件头信息在公网上传输时可能会被非法篡改的问题,提出一种保护DICOM文件头信息的方法。将文件头信息作为图像像素灰度值进行处理,利用信息-摘要算法5构造的Hash函数生成文件头的消息摘要值,并将该消息摘要值作为水印,以可逆不可见的方式嵌入DICOM图像,使用提取水印与重新生成水印的差异进行文件头信息篡改检测。实验结果表明,该方法对文件头信息篡改具有极强的敏感性,可以检测到1 bit的篡改,认证过程计算简单,且准确性较高。

关键词: 医学数字成像和通信文件, 医学图像, 无损水印, Hash函数, 篡改检测

Abstract: Aiming at the problem of illegally tampering of Digital Imaging and Communications in Medicine(DICOM) file header information when it transfers on the public network,a DICOM file header information tamper detection method is proposed.The method processes the file header information as image pixels,and generates the watermark of the file header information with Hash function constructed by Message-Digest Algorithm 5(MD5).The watermark of the image is embedded in DICOM image as an reversible and invisible way.The difference between the extracted watermark and the regenerated watermark is using for tamper detection of the DICOM file header.Experimental result indicates that,this method is highly sensitive to the file header information tampering.Even 1 bit change can be detected,the certification process is simple and the accuracy is high.

Key words: Digital Imaging and Communications in Medicine(DICOM) file, medical image, lossless watermark, Hash function, tamper detection

中图分类号: 

• TP309.2