排序方式: 共有206条查询结果,搜索用时 15 毫秒
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提出了一种基于基本音频扩频水印的改进扩频算法,引入随机信号的相关函数μ(x,b)作为水印系数.若使用本算法,加入水印与原始信号的PSNR值为 46.5091dB.本算法与基本扩频算法相比出错概率降低了37个数量级(在SNR=10dB的情况下),能承受的声能量也高出近10dB(在SNR=20dB的情况下),在抗噪性能与对水印能量的要求方面明显有了较大的改善.由于具备扩频水印的优点,因此在对音频的版权认证方面能起到很大的作用. 相似文献
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自动信任协商是陌生实体通过交替地披露属性证书建立信任关系的一种方法。主体拥有的不同属性之间可能存在着某种联系,某些属性的披露会导致其它敏感信息的泄露,即推理攻击。本文分析了属性间的线性关系,提出了属性敏感强度的概念,定义了属性敏感强度的偏序关系,在此基础上定义了自动信任协商系统抽象模型。针对几类推理攻击给出了相应的防御方案及其安全性分析。 相似文献
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One aim of pervasive computing is to allow users to share their resources so that they seem to be part of a single pervasive computer. This is just an illusion, the result of the synergy between different systems and resources. SHAD, introduced in PerCom 2007, is the first architecture that offers actual Single Sign-On to avoid authentication obtrusiveness and maintain the illusion of a single, pervasive computer. This paper describes how SHAD allows users to securely share their resources in a easy, natural, and intuitive way. It also describes its role-based Human-to-Human architecture, the threat model, and the protocols involved. Last but not the least, it presents results of further evaluation for our working implementation. 相似文献
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国内外新型食品包装材料审批管理模式分析 总被引:2,自引:0,他引:2
目的为我国新型食品包装材料审批管理体系提供借鉴,加快我国审批管理系统化的进程。方法介绍我国、美国、欧盟、加拿大、澳新、日本新型食品包装材料的审批管理在管理部门、审批方式、资料要求和发布形式方面的规定,比较各管理模式之间的异同,并分析相关性和显著特点,及其对我国管理的启示。结果各国在管理部门、审批方式、资料要求和发布形式4个方面有其显著的特点,对我国管理模式有很多值得借鉴的地方。结论各个发达国家基本建立了适合于本国的管理模式,在我国新型食品包装材料审批管理模式形成的初级阶段,应充分借鉴其他发达国家的先进经验,逐步形成适合我国国情的管理体系。 相似文献
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Isma Masood Yongli Wang Ali Daud Naif Radi Aljohani Hassan Dawood 《Telematics and Informatics》2018,35(4):677-701
Patient Physiological Parameters (PPPs) seem to be the most extensively accessed and utilized Personal Health Information (PHI) in hospitals, and their utilization by the various medical entities for treatment and diagnosis creates a real threat to patient privacy. This study aims to investigate whether PPPs access in a hospital environment violates patient privacy. If so, to what extent can we manage patient privacy while accessing PPPs in this environment? We investigated this question by analyzing questionnaire-based data from two Asian countries: Group A (China) and Group B (Pakistan). For data collection, we targeted those medical entities which were directly dealing with PPPs in their routine tasks. Results suggest that patient type directly influences the collection of PPPs: Group A (one-time?=?1.9, follow-up?=?1.06) and Group B (one-time?=?2.0 and follow-up?=?1.9). Both groups agreed that patients have the right to control their own PPPs. In both, doctors are the most trusted entity: for Group A, the Pearson Chi-Square with one degree of freedom is 1.414, p?=?0.234, whereas for Group B, the Pearson Chi-Square with three degrees of freedom is 4.511, p?=?0.11. Most of the Group A entities (92%) are familiar with unauthorized access of PPPs, while in Group B the level was only 35%. In Group B, only 35% of entities stated the purpose, specification and use limitations of PPPs. Doctors in both groups showed a high utilization of PPPs read authorization rights. This empirical evidence about PPPs usage in both countries will benefit health technology and improve policy on patient privacy. 相似文献
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介绍美国FedRAMP项目的背景和主要目标,梳理FedRAMP项目的治理实体和各利益相关方的义务、职责及相互交互,分析了FeRAMP项目的安全授权过程. 相似文献
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