共查询到17条相似文献,搜索用时 421 毫秒
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秘密共享是一种将秘密信息的片段共享给多个合法参与者的保密技术,可以有效预防对秘密信息的破译、截取、恶意破坏。图像秘密共享是近年来一个具有实用价值研究分支,目前已经衍生出很多种共享算法。L.Bai的投影矩阵方案是一种面向图像秘密共享的方案,可对该方案进行改进,对残差矩阵进行保护,可以避免残差矩阵因通信丢失而导致图像无法重构的问题,提高了该方案的安全性和可用性。 相似文献
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针对传统的基于视觉密码的图像秘密共享方案存在像素扩张导致其只能共享小尺寸的秘密图像、信息隐藏效率较低的问题,提出一种能够提高信息隐藏容量的(t,k,n)多重门限图像秘密共享方案.该方案利用秘密图像信息控制视觉密码方案中共享矩阵的选取,从而实现秘密图像在视觉密码方案中的隐藏.在秘密图像恢复的第一阶段,任意t个参与者直接叠加其影子图像后可以视觉解密出低质量的秘密图像信息;在第二阶段,任意k个参与者可以从影子图像中提取出隐藏的信息,并通过计算恢复出精确的灰度秘密图像.相对于传统的视觉密码方案,本文方案在不影响视觉密码恢复图像的视觉质量前提下,可以隐藏更多的秘密图像信息,而像素扩张尺寸较小. 相似文献
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基于二维细胞自动机提出了一种新的秘密图像共享方案,该方案把秘密图像作为细胞自动机的一个初始配置,通过利用二维n阶可逆存贮细胞自动机进行分解成n为份的影子图像,再利用其逆细胞自动机进行反向迭代来重构所共享的秘密图像.分析表明,该方案实现简单,在计算上是安全的,并且是一个完备的(n,n)方案. 相似文献
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本文提出基于视觉密码的数字水印技术,利用像素不扩展的(2,2)视觉密码方案,将秘密图像拆分成两个与秘密图像等大小的分享份图像,把两个分享份图像利用DWT-SVD水印算法嵌入到载体图像中,最后利用数字水印的提取算法,将两个分享份图像提取出来,进行叠加恢复秘密图像.基于视觉密码提取出来的分享份不会泄露秘密信息的任何内容,从而保证了秘密信息的安全性.实验结果表明,此方案可以抵抗常见的攻击行为. 相似文献
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为了解决传统视觉密码像素扩展度高的问题及分存图像占用存储空间过大问题,提出每次处理2个像素像素扩展度为1的(2,2)视觉密码方案.方案中,秘密图像为黑白二值图像,每次处理2个像素,得到的2个分享份额图像为黑白噪声图像,叠加分享份额恢复秘密图像.该方案解密过程简单,恢复秘密图像无变形,像素扩展度为1. 相似文献
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Recently, Chang et al. proposed a Sudoku-based secret image sharing scheme. They utilized the Sudoku grid to generate meaningful shadow images, and their scheme satisfied all essential requirements. Based on Chang et al.'s scheme, we propose a novel (n, n) secret image sharing scheme based on Sudoku. In the proposed scheme, a secret image can be shared among n different cover images by generating n shadow images, and the secret image can be reconstructed without distortion using only these n shadow images. Also, the proposed scheme can solve the overflow and underflow problems. The experimental results show that the visual quality of the shadow images is satisfactory. Furthermore, the proposed scheme allows for a large embedding capacity. 相似文献
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(n,n) visual secret sharing (VSS), first proposed by Naor and Shamir (1995) [4], is used to encode (encrypt) a secret image into n meaningless share images to be superimposed later to decode (decrypt) the original secret by human visual system after collecting all n secret images. In recent years, VSS-based image sharing (encryption) and image hiding schemes, two of a variety of applications based on VSS, have drawn much attention. In this paper, an efficient (n+1,n+1) multi-secret image sharing scheme based on Boolean-based VSS is proposed to not only keep the secret images confidential but also increase the capacity of sharing multiple secrets. The Boolean-based VSS technology, used to encode the secret images, generates n random matrices; then the n secret images are subsequently encoded into the n+1 meaningless share images. It is worthwhile to note that n secret images can be hidden by means of sharing only n+1 share images in the proposed scheme instead of 2n share images. Thus, the present scheme thus benefits from (1) reducing the demand of image transmission bandwidth, (2) easing the management overhead of meaningless share images, and (3) involving neither significant extra computational cost nor distortion for reconstructed secret images. The experimental results show the performance in terms of feasibility and image sharing capacity. Applied into image hiding schemes, the proposed scheme can enhance the hiding capacity. 相似文献
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为解决传统可视密码像素膨胀及分存图像无意义等问题,文中提出了一个具有掩盖图像的(2,2)可视密码方案。方案中密图为黑白反色图像,利用半色调技术将两个灰度图像处理后的半色调图像作为掩盖图像,根据密图修改掩盖图像生成分存图像,叠加分存图像恢复密图。方案符合可视密码解密简单的特性且分存图像有意义,没有引入任何像素膨胀。 相似文献
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Visual Cryptography Scheme (VCS) is a secret-sharing scheme which aims to encrypt a secret message into multiple shares and transmit them to participants over an untrusted communication channel. Although human vision can easily reveal the secret message by stacking a sufficient number of shares, this scheme reduces the visual quality of recovered images. This paper presents a novel high-quality and printer-friendly VCS. When providing high-quality recovery, this scheme keeps the size of the shares the same as the secret image. Experimental results show that, compared with previous work, the proposed scheme significantly improves the performance of recovered images. 相似文献
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牛冬梅 《信息安全与通信保密》2009,(8):72-73
文献[2]中提出了一种基于异或(XOR)操作的彩色图像秘密共享(2,n)方案,简单易于实现,但恢复密图的效果较差。通过分析此方案,文章提出一个多分存的彩色图像秘密共享(2,n)方案,通过给用户增加分存图像的方法改善了恢复密图的质量。实验分析表明所提方案不仅取得了很好的恢复效果,而且保持了安全性和算法的简单性。 相似文献
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Yu Chen Hu 《Electronics letters》2003,39(2):202-203
A novel image hiding scheme capable of hiding multiple grey-level images into another grey-level cover image is proposed. To reduce the volume of secret images to be embedded, the vector quantisation scheme is employed to encode the secret images. The compressed message is then encrypted by the DES cryptosystem to ensure security. Finally, the encrypted message is hidden into the cover image using the greedy least significant bit substitution technique. 相似文献