스마트폰 영상의 고유특성 추출(STCO)을 통한 영상 위·변조 검출기법
Forgery Analysis of Smart Phone Video by using Unique STCO Pattern in Video Container
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참고문헌
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초록
본 연구에서는 스마트폰 영상의 Video format 중 STCO (Sample table chunk offset) 특성을 중점적으로 분석하였다. 실험을 통해 스마트폰 제조사와 모델에 따라 STCO의 구간별 데이터 값이 독특한 패턴으로 존재함을 알 수 있었다. 또한 동일한 실험 데이터를 여러 편집 프로그램을 통해 2차 인코딩 영상물로 가공 후 생성되는 STCO의 구간별 데이터 값은 원본에서 만들어진 STCO의 구간별 데이터 값과 차이가 있음을 확인하였다. 결과적으로 본 연구를 통해 STCO의 구간별 데이터 값은 해당 영상의 고유 DNA 와 같은 특성을 갖는 것을 확인할 수 있었다. 이는 스마트폰으로 촬영된 영상의 원본 여부 판독에 대한 기술적 준거로 이용될 수 있을 뿐 아니라, 스마트폰 증거 영상에 대한 무결성 입증에 효과적으로 사용될 수있을 것으로 예상된다
Abstract
In this study, the characteristics of STCO (Sample table chunk offset) among the video formats of smartphone images were mainly analyzed. Through the experiment, it was found that the data values for each section of STCO exist in a unique pattern depending on the smartphone manufacturer and model. In addition, it was confirmed that the data value for each section of STCO created after processing the same experimental data into secondary encoded video through several editing programs is different from the data value for each section of STCO made from the original. As a result, through this study, it was confirmed that the data values for each section of STCO have the same characteristics as the intrinsic DNA of the image. It is expected that this can be used as a technical reference for reading the original image of an image taken with a smartphone, and can be effectively used for verifying the integrity of a smartphone evidence image.
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