| Summary: | 碩士 === 國立中央大學 === 資訊管理研究所 === 88 === For developing a safety network transmission environment, there are many cryptography methods that can be used to protect intellectual property rights and secret data, but the time complexity of encryption and decryption are very long. And the encrypted message becomes clutter data that is easy to be suspected. For solving these disadvantages, we use data hiding concepts, and hide a secret image into another two meaningful images. This makes people do not suspect that any secret data will be existed in these two images. Hence it will create a safe secret communication channel.
Some researchers had introduced some color image hiding methods[2, 6]. But they only can hide a color image with five or ten colors at most. It is quite restricted especially in the multimedia environment.
In this paper, we present a scheme which can be used to share a secret image with at least 256 colors into two meaningful cover images. We utilize random number generator and mask technology to solve the image boundary and color continuity problem to make cover images seem innocent and do not show any clue about the secret image block. Because of random number and secret key, even if two shares have been got by unauthorized persons, it is hard to decrypt to reveal the secret image.
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