Visual cryptography(VC) is an encryption technique for hiding a secret image in distributed and shared images(referred to as shares). VC schemes are employed to encrypt multiple images as meaningless,noisy patterns or meaningful images. However,decrypting multiple secret images using a unique share is difficult with traditional VC. We propose an approach to hide multiple images in meaningful shares. We can decrypt multiple images simultaneously using a common share, which we refer to as a magic sheet. The magic sheet decrypts multiple secret images depending on a given share. The shares are printed on transparencies, and decryption is performed by physically superimposing the transparencies. We evaluate the proposed method using binary, grayscale,and color images.
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