International Journal of Quality & Reliability ManagementEmerald Article: Consolidation of China's quality transformation efforts: a reviewKwai-Sang Chin, Kit-Fai Pun, Hong-Ming Hua

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To cite this document: Kwai-Sang Chin, Kit-Fai Pun, Hong-Ming Hua, (2001),"Consolidation of China's quality transformation efforts: a review", International Journal of Quality & Reliability Management, Vol. 18 Iss: 8 pp. 836 - 853

Permanent link to this document: http://dx.doi.org/10.1108/EUM0000000006032

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Leung B W, Ng F Y, Wong D S (Hong Kong CityUniversity, China)

On the security of a visual cryptography scheme forcolor imagesPattern Recognition (UK)2009 Vol 42 No 5: pp. 929–940SECURITY, VISUAL CRYPTOGRAPHY, COLOR IMAGES

Hou [Visual cryptography for color images, PatternRecognition 36 (2003) 1619-1629] proposed a four-sharevisual cryptography scheme for color images. The schemesplits a dithered eight-color secret image into four shares:the black mask and other three shares. It was claimed thatwithout knowing the black mask, no information about thesecret image can be obtained even if all the other threeshares are known. In this paper, we show that this may betrue for a few specific two-color secret images only. In allother cases, however, security cannot be guaranteed. Weshow that an attacker can compromise a randomly chosentwo-color secret image from any two of the other three

shares with probability47

by completely recovering the

shape and pattern of the secret image. The advantage will

increase to67

if all the three shares are known. If the secret

image has three or four colors, we show that the attacker can

compromise it with probability47

and835

, respectively.

Finally, we show that our technique can be extended tocompromising secret images with more than four colors.

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