  We propose to realize visual cryptography in an indirect way with the help of
computer-generated hologram. At present, the recovery method of visual
cryptography is mainly superimposed on transparent film or superimposed by
computer equipment, which greatly limits the application range of visual
cryptography. In this paper, the shares of the visual cryptography were encoded
with computer-generated hologram, and the shares is reproduced by optical
means, and then superimposed and decrypted. This method can expand the
application range of visual cryptography and further increase the security of
visual cryptography.
