Abstract
In secret image sharing schemes, the threshold may have to be adjusted in case of changes in the security policy and the adversary structure before recovering the secret image. For example, if participants leave the group, their stego images are useless to them and may not be kept safely. As a result, these images can be easily stolen and utilized by intruders, which reduces the security of the scheme. To solve this problem, we propose a novel threshold changeable secret image sharing scheme withNpotential changeable thresholdst1,t2,…,tN. By preparing advance shares for thresholdst1,t2,…,tNand using the two-variable one-way function to generate the identification value, we can change the threshold when necessary. The experiments show that the quality of the stego images in our scheme is satisfactory and the secret image can be recovered without distortion. Moreover, the security analysis shows that we can change the threshold safely.
Highlights
The rapid development of Internet has brought much more convenience to people’s daily lives, but it has brought security risks
The shares are camouflaged in a cover image to form the stego images, which cannot be distinguished by the human eye, so these shares can be concealed from intruders
We focus on the performance when the potential thresholds were set as [3, 5] and [4, 5], and we observed that different potential thresholds had little effect on the quality of the stego images when tN and N were fixed
Summary
The rapid development of Internet has brought much more convenience to people’s daily lives, but it has brought security risks. In order to solve this secret key protecting problem, Shamir [1] and Blakley [2] proposed (t, n) threshold secret sharing schemes independently. Shamir constructed his scheme based on polynomial interpolation, while Blakley provided a geometric construction. The random-noise-like images, which are meaningless, can attract malicious intruders’ attention. To solve this problem, Lin and Tsai [4] provided a (t, n) threshold image sharing scheme using steganography. Their scheme embeds watermarks into the stego images for verification
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