An Improved Boolean-based Multiple Secret Images Sharing Scheme for Different Sized Secret Images

• Main Authors: Jyun-Long Chen, 陳駿龍
• Other Authors: Chien-Chang Chen
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/07597824621170744633

碩士 === 淡江大學 === 資訊工程學系碩士班 === 103 === A Boolean-based multiple secret image sharing technique shares many secret images among participants using low computational Boolean operations. Previous studies dealt with sharing identical sized secret images. However, secret images may include different sizes for usage requirement. Therefore, this paper presents two schemes, named partial sensitivity different sized symmetric sharing-recovery (PDSR) and full sensitivity different sized symmetric sharing-recovery (FDSR), for generating shared images from secret images, in which shared images can have different sizes. These two schemes preserve a significant property of acquiring the same random image from different sized secret images or from shared images. The difference between these two schemes consists in the quality of recovered images when shared images are suffered from attacks. In PDSR, attacks outside the minimum sized area, which is defined as minimum shared image size between secret images, only fail to recover the corresponding secret image. But, attacks within the minimum sized area fail to recover any secret image. In FDSR, any attack on shared image leads to false recovery of any secret image. The proposed scheme modifies previous symmetric secret sharing algorithm to fit our requirement of different sized secret images. Therefore, these two proposed schemes are also symmetric of using the same function to generate shared images by secret images and to recover secret images by shared images. Experimental results show that these two proposed schemes takes similar computation time to share and to recover different sized secret images. Comparing with related Boolean based schemes, these two proposed schemes preserve the most integrated characteristics on sharing secret images and overcome all drawbacks that other schemes occurred.