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시각 암호화와 가상 위상영상을 이용한 광 암호화 시스템

Optical encryption system using visual cryptography and virtual phase images

  • 김인식 (경북대학교 전자전기컴퓨터학부) ;
  • 서동환 (경북대학교 전자전기컴퓨터학부) ;
  • 신창목 (경북대학교 전자전기컴퓨터학부) ;
  • 조규보 (경북대학교 전자전기컴퓨터학부) ;
  • 김수중 (경북대학교 전자전기컴퓨터학부) ;
  • 노덕수 (경일대학교 전자정보공학과)
  • 발행 : 2003.12.01

초록

광을 이용하여 암호화를 하는 경우는 위조 및 복제의 방지를 위하여 세기성분보다는 위상성분을 이용하여 주로 암호화를 하고 있다. 그러나 위상정보를 검출할 수 있는 장비가 개발된다면 정보를 유출 당할 수 있는 위험이 있다. 이러한 위험을 줄이기 위해 본 논문에서는 가상 위상영상을 이용하고 또한 정보를 다수가 공유할 수 있도록 시각 암호화(visual cryptography) 방법을 이용하여 정보를 보다 안전하게 보관하고 공유하는 시스템을 제안하였다.

We propose an encryption method using visual cryptography and virtual phase images. In the encryption process, the original image is shared by virtual images and the decryption key image. We multiply the virtual phase images with each complex image, which has the constant value of its sum after performing the phase modulation of the virtual images and the decryption key. The encryption cards are made by Fourier transforming the multiplied images. It is possible to protect information about the original image because the cards do not have any information from the original image. To reconstruct the original image, all the encryption cards are placed on each path of a Mach-Zehnder interferometer and then the lights passing through them are summed. Since the summed image is inverse Fourier transformed by a Fourier lens, the phase image is multiplied with the decryption key and the output image is obtained in the form of intensity on the CCD plane. Computer simulations show a good performance of the pro-posed optical security system.

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참고문헌

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