查询词典 security

In this paper, the concept of network security and security structures of OSI and Internet is introduced, and various threats confronting the computer network are also discussed. Several kinds of network information security technologies, including firewall technology, virtual private network, intrusion detection system, data encryption technology, identity authentication and security protocol etc. are also examined. The security of internal network is the biggest problem in the construction of each network. The solution to this problem lies in setting up a firewall. The theory of a firewall and the approach to its actualization is studied. Intrusion detection system, an important part of the computer network security system, has gained extensive attention. IDS monitors the computer and network traffic for intrusion and suspicious activities. It not only detects the intrusion from the extranet hacker, but also the intranet users. The emergence of virtual private network paves the way for realizing secure connection of LAN quickly and at a relatively low cost. The concept, function, key techniques, including the tunnel technology, and the ways to realize VPN are expounded in this paper. Also introduced is the data encrypt network technology, which is called the soul of computer network security, such as digital digest, digital signature, digital certificate, digital encrypt arithmetic and so on. At the same time, the principle and the process of implementing network security by digital certificate and digital signature, the basic principle and characters of security protocols, and finally, three of the security protocols, concerning the security problems in network, IPsec, SLL and SET are analyzed in detail Computer network system should be a system of dynamic defence, both dynamic and static, passive as well as active, and even offensive, combined with management and technology.

本文系统地介绍了网络安全的概念、OSI及Internet的安全体系结构，并讨论了计算机网络面临的各种安全威胁；内部网络的安全问题是每个建网单位面临的最大问题，可以认为防火墙技术是解决网络安全的一个主要手段，本文研究了防火墙的原理及其实现手段；作为一种主动的防御措施，入侵检测系统作为网络系统安全的重要组成部分，得到了广泛的重视，TDS对计算机和网络资源上的恶意使用行为进行识别和响应，不仅检测来自外部的入侵行为，也监督内部用户的未授权活动；虚拟专用网技术的出现，为实现网络间的连接提供了快速安全但又相对便宜的手段，本文较深入的探讨了实现VPN的隧道技术，并对VPN的概念、功能、实现途径、基本构成、关键技术及发展前景等问题进行了全面论述；数据加密技术是网络安全核心技术之一，本文从数据加密算法、数字摘要、数字签名及数字证书等几方面简要介绍了数据加密技术，并分析用数字证书和数字签名实现网络安全的原理和过程；对安全协议的基本原理、主要特点进行了较为深入的研究，并就网络的安全性问题剖析了三种安全协议：IPsec协议、SLL协议和SET协议。

Through the comparative analysis between the functions of the government"s'role in establishing a social security system in Britain, the US, Germany, Japan and other countries and Chinese government"s absence from their duties in establishing rural social security, we know, under the socialist market economic conditions, the government should bear the basic responsibilities in establishing the rural social security system, just to build a basic framework of the rural social security system adapted to the level of economic development, to establish a rural social security management system, to bear national financial responsibility in establishing the rural social security and promote mufti—dimensionally raising funds, to establish a rural social security monitoring mechanism, to establish a rural social security law system, to create external environment of the rural social security system, and so on.

在英、美、德、日等国构建社会保障制度中政府职能的角色定位与我国农村社会保障政府缺位的比较分析中，我们得出，在社会主义市场经济条件下，构建农村社会保障体系中政府应承担的基本职责，即构建和经济发展水平相适应的农村社会保障制度的基本框架，建立健全农村社会保障管理体制，承担国家对农村社会保障的财政责任并推动多渠道筹集资金，建立健全农村社会保障的监管机制，推动农村社会保障的法律体系建设，创造农村社会保障制度建设的外部环境等等。在当前的条件下，我国政府应着手采取现实可行的具体措施来履行其职能、推进我国农村社会保障体系的建设。

But our country's present social security system actually has the hindrance function to the occupation mobility, the main performances are as follows: Two units social security system, the unequal tax revenue system in the social security, social security singleness in view of the impoverished social class, hardly carried and transferred characteristics of social security system , ignoring benefits protection of mobile staffs, lack of social security legislation , slow development of service system of social security ,lack of policies and measures on promoting regional motilities insocial security system.

但是，我国现行的社会保障制度却对职业流动有着一定的阻碍作用，主要表现为：二元的社会保障体系的存在，社会保障体系的便携性、可转移性较差，忽视流动职工的利益保护，社会保障立法的缺失，社会保障服务体系发展缓慢，社会保障中税收体系的不平等，针对贫困阶层的社会保障单一，社会保障体系缺少促进区域流动的政策与措施等方面。

This thesis deeply researches the J2EE security strategy on the application tier of enterprise system. The security strategy predigests the information security model and meets the security requirements expediently. But there are some disadvantages when the security requirements become more complex. The expositive security on the Web-Tier can not offer more information for authentication; there is no authentication for EJB-Tier to use, make the EJB-Tier depend on the Web-Tier; J2EE uses database or application server to manage the role information. Use database to manage the role information will increase the complex of enterprise application, and the way of application server will reduce the ability of migrate other J2EE platform. To solve these problems, the thesis designs an improved security strategy model.

本文从企业级系统应用层安全的角度出发，深入研究J2EE多层体系结构的安全策略模型。J2EE提供的安全策略简化了系统的信息安全模型，能够很方便地满足基于J2EE的分布式应用系统的安全需求，但是在面对更加复杂的安全需求时，J2EE安全策略在验证授权和角色管理中还存在不足之处：其在Web层的声明式验证机制无法为用户提供更多验证信息，可扩展性较差；在EJB层缺少业务逻辑层可供采用的验证机制，而是借助于Web层的验证机制，其耦合程度较高有悖于业务逻辑分离于表现逻辑的原则；在角色管理方面，J2EE采用数据库或者应用服务器来管理角色信息，其中，数据库管理角色的方式增加了应用开发的复杂度，应用服务器管理角色降低了系统的可移植性，两者都具有片面性。

Currently it still exists many problems in Social Security System, such as incomplete legal institutions of social security, incapacious scope of security coverage, insufficient social security funds, disordered department functions and third sector's laggard development in social security system even though we have achieved obvious fruits in the reform of Social Security System, relatively increased the scale and level of social security too.

虽然我国社会保障体制改革取得了有目共睹的成绩，社会保障规模和水平也相对提高，然而我国的社会保障体制还存在着社会保障法律制度不完善；保障覆盖面狭小；社会保障资金不充足；部门职能混乱和社会保障第三部门发展缓慢等问题。

Reform the goal with development to orient according to the social security system,social security fund is it should is it give consideration to social goal,economic goal,political goal to insist on to raise for,give consideration to the long—term goal and short—term goal, realiz.e combining fairly with efficiency;The social security fund must divide the responsibility border among government,unit,individual to raise rationally,define that govemment and function of the market divide the work;Social security fund is it must pay attention to macroscopical system way choose,is it pay attention to micro technical design and application of field to want too atthe same time to raise for;Social security fund is it should take different raising the way for,raising the way for to different social security project to raise for;Social security fund is it should distinguish regular financial need raising waying,principling of raising the way for etc.different from provisional financial need to raise for.

根据社会保障制度改革与发展的目标定位，社会保障基金筹集应当坚持兼顾社会目标、经济目标和政治目标，兼顾长期目标与短期目标，实现公平与效率相结合；社会保障基金筹集必须合理划分政府和单位、个人之间的责任边界，明确政府与市场的合理职能分工；社会保障基金筹集必须重视宏观制度方式选择，同时也要重视微观领域的技术设计与应用；社会保障基金筹集应针对不同的社会保障项目采取不同筹集方式、筹集途径；社会保障基金筹集应区分经常性资金需要和临时性资金需要采取不同的筹集方式、筹集途径等原则。

Provable Security is a formal method for proving the security of cryptographic schemes, in which the difficulty of breaking a particular scheme is formally related to that of solving a widely believed computational hard problem. Provable security has already become an important theme of theoretical researches in modern cryptography. This dissertation investigates the provable security of public-key encryptions and hybrid encryptions of asymmetric and symmetric encryptions. This includes the various formal security notions and the constructions can be proved to achieve them. Among the constructions, hybrid encryptions are themselves an important way to obtain public-key encryption schemes with chosen ciphertext security. The main results are as follows:(1) The one-wayness of the trapdoor one-way function in NTRU depends on the randomness of the session key, which is different from previous ones. Based on this observation, a new kind of trapdoor one-way function, trapdoor one-way functions with an auxiliary random variable is proposed.

可证明安全性是一种证明密码学方案安全性的形式化方法，它将密码学方案的安全性归约为公认的计算难题，已成为现代密码学领域中理论工作的主线，本文主要研究公钥加密与单双钥混合加密的可证明安全性，这包括它们的各种形式化安全性定义以及达到这些安全性定义的方案构造，而单双钥混合加密本身也是一种构造选择密文安全公钥加密的重要方法，本文得到的主要结果如下：(1)在研究NTRU公钥加密的特殊性基础上，对于公钥加密的陷门单向函数加密模型进行了扩展，提出了具有辅助陷门单向函数的概念，并将其扩展到多元的情况，讨论了可能的密码学用途。

This paper,after reviewing endowment insurance,cooperation medical treatment,bottommost life security and immigrant worker's security,concludes the following problems in rural social security system of Heilongjiang: wide coverage of security with lower insurance payment;many problems existing in implementing new-type rural cooperation medical system and bottommost life security system;ever-increasing government's focus on immigrant worker's security.

黑龙江省是一个农业大省，在确保全国粮食供应方面做出了很大贡献。近年来，随着经济发展和社会进步，黑龙江省的农村社会保障制度建设也有了一定发展。但是，不可否认的事实是，黑龙江省农民的一些生产和生活仍然缺乏必要的保障，如农村养老保险问题、看病问医困难的问题等等。

From the aspects of systematology and tourist geology, tourist security is taken as a risk system, which is a special complicated and correlated system consisting of the tourists and the environment of the scenic spot. The implication, formation, structure and the research content of tourist security are preliminarily explored; and the security analysis, security assessment, and security measures of the system are correlatively studied so as to find sane solution of the security problem existing in the development of modern tourist industry.

笔者从系统论和旅游地理学的角度，把旅游安全作为一个风险系统进行研究；认为旅游安全风险系统是由旅游者与旅游景区环境共同组成的一个复杂的特定的相互依赖的系统；初步探讨旅游安全风险系统的组成、结构和研究内容；对旅游安全风险系统的安全分析、安全评价和安全措施进行了相关研究；通过研究，以期弄清现代旅游业发展中存在的安全问题，提出旅游安全风险对策。

This paper carries on the discussion and collects to the security risk factor of such aspects as the technology, management and system, etc. And propose a Measurement-based Improvement Operation for Software Security Risk (SEcurity Risk Improvement Operation; SERIO). Applying the SERIO to software development, can help to find out the potential security risk, derive out improvement of the security risk and control operation, and increase the security of the software system effectively.

本文针对技术、管及制等层面的安全风险因子进探讨与搜集，且提出一套以测为基础的软体安全风险改善作业(SEcurity Risk Improvement Operation； SERIO)，协助软体开发过程中，找出潜在的安全风险，且衍生出安全风险的改善与监控作业，有效提高软体系统的安全性。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？