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Encrypted Pixels for Secure Displays |
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| Mon, April 19 2004 | 10:23PM | PermaLink |
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"A mask that decodes encrypted pixels ensures that sensitive information can be viewed securely.
When you view secure information on a screen, there is always the risk that someone is peering over your shoulder and taking notes. To remove this worry, scientists in Japan have been experimenting with a technique known as visual cryptography. The team believes this approach could ensure the security of information displayed on PDAs, computer screens or bank terminals.In a visual cryptography system, the image containing the sensitive information is encrypted and appears as a random pattern. The only way to view the information is to place a decoding mask over the encrypted image. Hirotsugu Yamamoto and colleagues from the University of Tokushima have developed a decoding mask that has two functions: to decrypt the display and limit the viewing zone of the decrypted image. Key to the technique is an algorithm that generates the pixels in both the encrypted image and the mask. The team’s paper describes its algorithm to encrypt images containing 8 colours."
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http://optics.org/articles/news/10/4/20/1#securedisplay
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