基于安全芯片的防伪数码相机  

Digital camera to take trusted photo based on TPM chip

作　　者：罗应文[1] 王哲[1] 苏鸿根[2] 

机构地区：[1]中国科学院研究生院,北京100049 [2]中国科学院软件研究所,北京100080

出　　处：《计算机工程与设计》2010年第7期1591-1594,共4页Computer Engineering and Design

摘　　要：为了改进现有防伪数码相机不能处理通过翻拍伪造数码照片的缺陷,提出了一种新的基于安全芯片的防伪数码相机架构。在拍摄时将所拍摄的区域分成多个小单元,并用对焦测距系统测量各个单元到相机的距离。用安全芯片对图像元数据、图像内容及距离信息进行数字签名,并将签名内容及距离信息都保存在图像文件的元数据里。通过验证数字签名有效且距离信息不完全相等来保证图片的真实可信。该防伪数码相机能同时发现照片在拍摄后被篡改和翻拍问题,所拍摄照片真实可信。To improve the flaws that trusted digital camera can＇t discover making a fake digital image by copying photo,a new digital camera architecture for capturing trusted images based on TPM chip is presented.Firstly,the capture scope is divided into many small units,and all distances between small units and camera are measured by focusing and measuring system.Then a digital signature is pro-duced by TPM chip which is given image metadata,image content and all distances,and all data is stored in the image,finally,the image is trusted if the signature is valid and these distances are not entirely equal.A photo is captured by this kind of security camera which can detect a modified or copied photo.

关 键 词：数码相机 安全芯片 数字签名 透镜成像原理 照片翻拍 RSA公开密钥密码体制 

分 类 号：TP309.1[自动化与计算机技术—计算机系统结构]