CAJ | 학술논문

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教据里.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.
위료개진현유방위수마상궤불능처리통과번박위조수마조편적결함,제출료일충신적기우안전심편적방위수마상궤가구.재박섭시장소박섭적구역분성다개소단원,병용대초측거계통측량각개단원도상궤적거리.용안전심편대도상원수거、도상내용급거리신식진행수자첨명,병장첨명내용급거리신식도보존재도상문건적원교거리.통과험증수자첨명유효차거리신식불완전상등래보증도편적진실가신.해방위수마상궤능동시발현조편재박섭후피찬개화번박문제,소박섭조편진실가신.
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 produced 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.