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为了构建一个较公钥基础设施(PKI)要求更为简单的公钥密码系统,Gentry提出了基于认证的公钥加密方案.在基于认证的公钥加密方案中,第三方对认证申请者的公钥或身份进行签名,并将该签名作为认证发送给申请者,申请者保留认证作为解密时的部分私钥.接收方对密文解密需要同时拥有第三方对其公钥的认证和接收方公钥对应的私钥,因而基于认证的加密方案同时具备基于身份加密方案中公钥的可认证性和传统公钥加密方案中私钥的免撤销性.基于Gentry身份加密算法提出一种高效、短公钥的基于认证的混合加密算法,新算法能在标准(非随机预言机)模型下被证明抗适应性选择密文攻击. 相似文献
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2003年,Gentry提出基于认证的公钥加密方案.在基于认证的公钥加密方案中,第三方对认证申请者的公钥和/或身份进行签名,并将签名作为认证发送给申请者,申请者保存该认证作为解密时的部分私钥.接收方对密文解密需要同时拥有第三方对其公钥和/或身份的认证和接收方公钥对应的私钥,因此基于认证的加密方案同时具备基于身份加密方案的公钥可认证性和传统公钥方案中的私钥免撤销性.本文提出一种高效、紧凑的基于认证的公钥混合加密算法,新算法能在非随机预言机模型下被证明满足选择密文攻击安全. 相似文献
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文章介绍了互素序列的定义和杠杆函数的概念,描述了REESSE1-E签名方案的密钥生成、数字签名和身份验证三个算法,证明了验证算法的正确性,示范了如何利用变量之间的组合来构造难题.文章从五个主要方面分析了签名与验证的安全性,它包括从公钥推导私钥、从签名码提取私钥、仅通过公钥伪造签名码、通过已知签名码和公钥伪造另一个签名码以及通过选择消息伪造签名码等.分析表明基于变量组合的REESSE1-E签名方案的安全性等价于离散对数难题. 相似文献
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左黎明 《微电子学与计算机》2012,29(1):124-126,130
辫群是构造对抗量子公钥密码系统的新工具.已知的基于辫群共轭问题的公钥密码系统都受到不同程度的攻击.提出了一个基于辫群求根问题的公钥密码算法,随后对算法的正确性、安全性、参数选择和效率进行分析.新的公钥密码算法可以抵抗各种已知攻击. 相似文献
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In order to enrich the performance of the user's location information and to meet the diverse needs of users,a location privacy protection scheme based on attribute encryption was designed,which provided precise,more accurate,fuzzy and private four modes to manage the location information.The scheme was based on the algorithm of WT-CP-ABE.The location information was divided into three parts according to a close friend of grade,then the key infor-mation and position information was encrypted with attribute-based encryption and symmetric encryption method respec-tively and the ciphertext was published to the social network.The security of the scheme is analyzed,which shows that the scheme has the advantage of user attribute information confidentiality,data confidentiality and can resist the collusion attack. 相似文献
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本文借鉴D.Boneh(1997)中密钥产生和Y.Desmedt(1991)中的密钥分拆思想,提出了一种有t个容错能力的(t+1,n)门限托管方案,方案可以避免阈下攻击,验证用户的托管密钥正确性,有效地检查出失效的托管代理,并具有密钥备份的能力。方案可用于多种通信方式。 相似文献
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H Vicky Zhao Min Wu Z Jane Wang K J Ray Liu 《IEEE transactions on image processing》2005,14(5):646-661
Digital fingerprinting is a technology for tracing the distribution of multimedia content and protecting them from unauthorized redistribution. Unique identification information is embedded into each distributed copy of multimedia signal and serves as a digital fingerprint. Collusion attack is a cost-effective attack against digital fingerprinting, where colluders combine several copies with the same content but different fingerprints to remove or attenuate the original fingerprints. In this paper, we investigate the average collusion attack and several basic nonlinear collusions on independent Gaussian fingerprints, and study their effectiveness and the impact on the perceptual quality. With unbounded Gaussian fingerprints, perceivable distortion may exist in the fingerprinted copies as well as the copies after the collusion attacks. In order to remove this perceptual distortion, we introduce bounded Gaussian-like fingerprints and study their performance under collusion attacks. We also study several commonly used detection statistics and analyze their performance under collusion attacks. We further propose a preprocessing technique of the extracted fingerprints specifically for collusion scenarios to improve the detection performance. 相似文献
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陈泽文等人提出了一种基于中国剩余定理的群签名方案。文中认为,该方案可以在不改变其他有效成员签名密钥的情况下,增加或者撤销一个群成员,并且在撤销过程中不改变公钥的长度,可以抗击联合攻击、伪造签名等。但是研究发现,该方案在公共模上的疏忽,使其无法面对伪造签名攻击,并且存在在合谋情况下,实现将大整数n分解的概率算法,论文对其做出了改进。 相似文献
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Video copyright protection has become important as it is possible to make unlimited copies of digital video without quality
loss. Video watermark is the main method of video copyright protection. A novel blind video watermarking scheme is proposed
in this paper, in which independent component analysis (ICA) is used to extract the common static component and relative dynamic
component from the consecutive frames. And then a designed watermark is embedded into the wavelet coefficients of the obtained
dynamic component according to the 4-neighboring-mean based algorithm. The binarization of the 3-level-approximate sub-image
of the I-frame in each GOP (GOP-Group of Picture) is selected as the watermark for this GOP. Given such watermark, the scheme
can easily resist copy attack and temporal synchronization. Besides, because the watermarks of different GOPs and their embedding
positions in a GOP are different, the intra-video collusion attack can be resisted effectively and there is no possibility
for inter-video collusion attack to succeed. The simulation shows the feasibility of this scheme, which can resist well temporal
synchronization, copy attack, and collusion attack.
Published online: February 2006 相似文献
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利用动态累加器的证人能够证明特定累加项是否参与累加的特性,实现了组成员身份认证,提出了一种新的支持节点动态增加和撤销的组密钥管理方案DAAG。在需要建立组密钥时,所有成员节点提供自己持有的累加项,参与累加计算。DAAG方案在保证成员节点证人机密性的基础上, 通过绑定证人与组密钥更新计算,限制了非成员节点对新密钥的计算能力。安全性和性能分析表明,DAAG方案虽比FM方案消耗更多的通信代价,但能够抵抗伪造、重放和共谋等恶意攻击,提供前后向安全性。 相似文献
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基于离散对数困难问题,利用随机序列提出一种公钥叛逆者追踪方案。该方案采用多项式与过滤函数来构建,当缴获盗版解码器时,只需通过一次输入输出即可确定叛逆者。若需要撤销或恢复多个叛逆者时,其能在不更新其他合法用户私钥的前提下,实现完全撤销多个叛逆者或完全恢复已撤销用户。性能分析证明,该方案不仅存储、计算和通信开销低,还具有完全抗共谋性、完全撤销性与完全恢复性以及黑盒追踪的特点。 相似文献
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利用双线性配对技术提出一个新的基于身份的广播加密方案。在标准模型下,证明了该方案具有适应性攻击安全模型下选择明文安全性。方案中的公钥参数和用户私钥均为固定长度,密文长度较短,并且,新方案还满足完全抗同谋攻击。与现有的广播加密方案相比,新方案更适用于存储量小的系统。 相似文献