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標題: 具可調視覺品質的新型門檻式視覺機密分享機制之研究
A Study of Novel Threshold Visual Secret Sharing with Adaptive Visual Quality
作者: 鄭子豪
Cheng, Tzu-hao
關鍵字: 視覺機密分享;Visual secret sharing;視覺密碼;可調解密對比度;門檻式視覺機密分享;Visual cryptography;Contrast adaptive;Threshold secret sharing
出版社: 資訊管理學系所
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在各種不同的加密機制中,視覺機密分享機制(Visual Secret Sharing; VSS)有別於一般密碼學,能在不需任何計算的前提下,利用人類視覺將機密進行解碼。視覺機密分享機制將機密訊息編碼成數張分享影像(share, shadow),在解碼時僅需將不同的分享影像進行疊合,利用兩種不同顏色的性質控影響通過分享影像之光線,使人類視覺直接解讀機密影像。然而傳統視覺機密分享機制在新應用上常存在著像素擴展、分享影像數量較少以及解密時無法控制調整解密門檻數等問題。

In the variety of encoding methods, visual secret sharing differ from the other cryptography methods which decodes by the human visual system rather than complex computing during the decoding process. Visual secret sharing schemes encode the secret information into the noise-like binary share images. For reconstructing the secret images, stack the different share images together and use the different nature of two colors to control the transparency of the white and black area of the reconstructed secret image to reconstruct the secret image, then the stacking result can show the decoded secret image which can read by human eyes. Therefore, the traditional visual secret sharing scheme has the problem of pixel expansion, less share images and can’t provide the decoding threshold.
In view of these disadvantages, we proposed a novel threshold visual secret sharing scheme with adaptive visual quality, which can encode the secret into more share images and set different reconstructing contrasts for different number of share images, the higher contrast brings the clearer reconstructed secret image; on the other hand, the lower contrast brings the higher decoding threshold.
After the experiment and compared with similar methods, the results show that the proposed method is superior to the other scheme which can satisfy the basic demand of the visual secret sharing scheme, set the contrast, provide more share image and increase the performance at the same time.
其他識別: U0005-1607201323304400
Appears in Collections:資訊管理學系

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