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This paper presents a new visual cryptography scheme for secure digital transmission. Visual cryptography can be seen as a one-time pad system. Then, it cannot be reused. In this paper, the authors apply Diffie and Hellman (D-H) key agreement method and Toral Automorphism (TA) such that visual cryptography can be reused. Both secret and symmetry-key are represented in binary image. The proposed scheme is simple and easy to be implemented for shadow images. Therefore, it can be used in many electronic business applications.
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