隨機網格式之視覺機密分享通用取存機制

視覺密碼學的研究者一直以來的目標就是降低像素擴展與提升還原影像的品質。近年來提出的通用存取結構（General Access Structures），都是以像素擴展式機密分享的作法為主。Kafri與Keren 所提出的隨機網格，改善了像素擴展的問題。本研究提出一個將機密影像依通用存取結構編碼為多張分享投影片，透過隨機編碼與控制分配的概念，產生相似於隨機網格的分享投影片，此模型具備漸進式還原效果的方法，我們稱之漸進式半隨機網格視覺機密分享模型（Progressive Semi-Random Grids Visual Secret Sharing Model；PSRD VSS Model），簡稱為PSRD模型。

關鍵字

視覺機密分享；視覺密碼學；漸進式視覺機密分享；半隨機網格

並列摘要

The goal of visual cryptography's researchers are reduce the pixel-expansion and enhance the restored image quality. General access structures that proposed in recent years based on pixel-expansion. Kafri and Keren （1987）proposed a random grid, to improve the pixel-expansion problems. This study proposes a general access structures of the secret image is encoded as multiple share transparencies, through the concept of random and control distribution, make the share transparencies that are similar to the random grid and restore with progressive, we call Progressive Semi-Random Grids Visual Secret Sharing Model referred to as PSRD VSS Model.

並列關鍵字

Visual secret sharing ； Visual cryptography ； Progressive visual secret sharing ； Semi-random grid

參考文獻

[1] 侯永昌，官振宇，〈有意義且不擴展分享影像之漸進式視覺密碼〉，資訊管理學報，第17卷，第3期，頁131-154，ISSN：1608-5752，2011年。

[2] Ateniese, G., Blundo, C., De Santis, A., and Stinson, D. R., “Visual cryptography for general access structures,” Information and Computation, 129（2）, 86-106, 1996.

[3] Ateniese, G., Blundo, C., De Santis, A. and Stinson, D. R., Extended Capabilities for Visual Cryptography, Theoretical Computer Science, Vol.250, Issue 1-2 (January 2001), 143-161, 2001.

[4] Chen, T. and Tsao, K., “User-friendly random-grid-based visual secret sharing”, IEEE Transactions on Circuits and Systems for Video Technology, 21（11）, 1693-1703, 2011.

[5] Chen, S. K., “Friendly progressive visual secret sharing using generalized random grids,” Optical Engineering, 48（11）, 117001-1－117001-7, 2009.

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隨機網格式之視覺機密分享通用取存機制

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