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.

可證明安全性是一種證明密碼學(xué)方案安全性的形式化方法，它將密碼學(xué)方案的安全性歸約為公認(rèn)的計(jì)算難題久久精品亚洲国产一区二区，已成為現(xiàn)代密碼學(xué)領(lǐng)域中理論工作的主線成年人视频网址，本文主要研究公鑰加密與單雙鑰混合加密的可證明安全性，這包括它們的各種形式化安全性定義以及達(dá)到這些安全性定義的方案構(gòu)造人操人人人干，而單雙鑰混合加密本身也是一種構(gòu)造選擇密文安全公鑰加密的重要方法男女交配视频免费观看，本文得到的主要結(jié)果如下：(1)在研究NTRU公鑰加密的特殊性基礎(chǔ)上，對(duì)于公鑰加密的陷門(mén)單向函數(shù)加密模型進(jìn)行了擴(kuò)展，提出了具有輔助陷門(mén)單向函數(shù)的概念成人网站日韩在线视频观看免费，并將其擴(kuò)展到多元的情況av在线www天堂网，討論了可能的密碼學(xué)用途。

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.

本文系統(tǒng)地介紹了網(wǎng)絡(luò)安全的概念www.ccfdmy.com、OSI及Internet的安全體系結(jié)構(gòu)农村高清性色生活片，并討論了計(jì)算機(jī)網(wǎng)絡(luò)面臨的各種安全威脅；內(nèi)部網(wǎng)絡(luò)的安全問(wèn)題是每個(gè)建網(wǎng)單位面臨的最大問(wèn)題欧美黑妞A片黑妞BBW，可以認(rèn)為防火墻技術(shù)是解決網(wǎng)絡(luò)安全的一個(gè)主要手段国产一区二区三区在线视频，本文研究了防火墻的原理及其實(shí)現(xiàn)手段；作為一種主動(dòng)的防御措施国产人成777在线视频直播，入侵檢測(cè)系統(tǒng)作為網(wǎng)絡(luò)系統(tǒng)安全的重要組成部分羞羞真人视频，得到了廣泛的重視，TDS對(duì)計(jì)算機(jī)和網(wǎng)絡(luò)資源上的惡意使用行為進(jìn)行識(shí)別和響應(yīng)wwwxxxxcon在线国产观看，不僅檢測(cè)來(lái)自外部的入侵行為www.AV天堂2011，也監(jiān)督內(nèi)部用戶的未授權(quán)活動(dòng)；虛擬專用網(wǎng)技術(shù)的出現(xiàn)自拍偷拍亚洲福利，為實(shí)現(xiàn)網(wǎng)絡(luò)間的連接提供了快速安全但又相對(duì)便宜的手段国产专区欧美精品激情，本文較深入的探討了實(shí)現(xiàn)VPN的隧道技術(shù)，并對(duì)VPN的概念黄色国产在线观看、功能在线免费观看操美女视频、實(shí)現(xiàn)途徑、基本構(gòu)成好硬好爽好大高潮不断视频、關(guān)鍵技術(shù)及發(fā)展前景等問(wèn)題進(jìn)行了全面論述4444在线视频看片；數(shù)據(jù)加密技術(shù)是網(wǎng)絡(luò)安全核心技術(shù)之一，本文從數(shù)據(jù)加密算法亚洲免费操、數(shù)字摘要www.pylng.com、數(shù)字簽名及數(shù)字證書(shū)等幾方面簡(jiǎn)要介紹了數(shù)據(jù)加密技術(shù)，并分析用數(shù)字證書(shū)和數(shù)字簽名實(shí)現(xiàn)網(wǎng)絡(luò)安全的原理和過(guò)程18r免费网址；對(duì)安全協(xié)議的基本原理亚洲性爱区视频、主要特點(diǎn)進(jìn)行了較為深入的研究，并就網(wǎng)絡(luò)的安全性問(wèn)題剖析了三種安全協(xié)議：IPsec協(xié)議黄色网页在线免费的、SLL協(xié)議和SET協(xié)議动漫无遮挡H纯肉亚洲资源大片。

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、美欧美99精品免费久久看、德国产就是干在线、日等國(guó)構(gòu)建社會(huì)保障制度中政府職能的角色定位與我國(guó)農(nóng)村社會(huì)保障政府缺位的比較分析中，我們得出40XXOO.com，在社會(huì)主義市場(chǎng)經(jīng)濟(jì)條件下91绿帽人妻精品，構(gòu)建農(nóng)村社會(huì)保障體系中政府應(yīng)承擔(dān)的基本職責(zé)亚洲日韩欧美福利区一久，即構(gòu)建和經(jīng)濟(jì)發(fā)展水平相適應(yīng)的農(nóng)村社會(huì)保障制度的基本框架，建立健全農(nóng)村社會(huì)保障管理體制A片免费网站在线播放，承擔(dān)國(guó)家對(duì)農(nóng)村社會(huì)保障的財(cái)政責(zé)任并推動(dòng)多渠道籌集資金久久这里的视频都是精品，建立健全農(nóng)村社會(huì)保障的監(jiān)管機(jī)制，推動(dòng)農(nóng)村社會(huì)保障的法律體系建設(shè)有关强奸的黄片小视频，創(chuàng)造農(nóng)村社會(huì)保障制度建設(shè)的外部環(huán)境等等黄色网岛国。在當(dāng)前的條件下，我國(guó)政府應(yīng)著手采取現(xiàn)實(shí)可行的具體措施來(lái)履行其職能国产精品一二三区私人网站、推進(jìn)我國(guó)農(nóng)村社會(huì)保障體系的建設(shè)男女操逼视频网址国产。

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.

本文從企業(yè)級(jí)系統(tǒng)應(yīng)用層安全的角度出發(fā)，深入研究J2EE多層體系結(jié)構(gòu)的安全策略模型日韩激情无码一区二区三区91。J2EE提供的安全策略簡(jiǎn)化了系統(tǒng)的信息安全模型在线推荐一个可以看黄色av的网站，能夠很方便地滿足基于J2EE的分布式應(yīng)用系統(tǒng)的安全需求，但是在面對(duì)更加復(fù)雜的安全需求時(shí)国产免费极品在线观看AV，J2EE安全策略在驗(yàn)證授權(quán)和角色管理中還存在不足之處：其在Web層的聲明式驗(yàn)證機(jī)制無(wú)法為用戶提供更多驗(yàn)證信息久久91精品国产，可擴(kuò)展性較差；在EJB層缺少業(yè)務(wù)邏輯層可供采用的驗(yàn)證機(jī)制91九色在线播放国产日韩，而是借助于Web層的驗(yàn)證機(jī)制女同视频自拍自自拍，其耦合程度較高有悖于業(yè)務(wù)邏輯分離于表現(xiàn)邏輯的原則；在角色管理方面看av免费，J2EE采用數(shù)據(jù)庫(kù)或者應(yīng)用服務(wù)器來(lái)管理角色信息亚洲欧美日韩一区二区三区图片，其中，數(shù)據(jù)庫(kù)管理角色的方式增加了應(yīng)用開(kāi)發(fā)的復(fù)雜度欧美娇小性XXXXBBBB，應(yīng)用服務(wù)器管理角色降低了系統(tǒng)的可移植性800av免费在线视频，兩者都具有片面性。

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.

雖然我國(guó)社會(huì)保障體制改革取得了有目共睹的成績(jī)日韩三级黄色A片，社會(huì)保障規(guī)模和水平也相對(duì)提高国产乱子伦视频在线播放，然而我國(guó)的社會(huì)保障體制還存在著社會(huì)保障法律制度不完善；保障覆蓋面狹醒侵拮酆贤计∷导で椤；社會(huì)保障資金不充足免费观看人成视频网；部門(mén)職能混亂和社會(huì)保障第三部門(mén)發(fā)展緩慢等問(wèn)題你懂的在线欧美。

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，我國(guó)現(xiàn)行的社會(huì)保障制度卻對(duì)職業(yè)流動(dòng)有著一定的阻礙作用AV黄色网站网址，主要表現(xiàn)為：二元的社會(huì)保障體系的存在人人操人人干人人要，社會(huì)保障體系的便攜性、可轉(zhuǎn)移性較差91人人国产中文字幕，忽視流動(dòng)職工的利益保護(hù)免费网站日本永久免费观看，社會(huì)保障立法的缺失黑人与中国妞无码AV，社會(huì)保障服務(wù)體系發(fā)展緩慢，社會(huì)保障中稅收體系的不平等欧美50岁熟妇一级毛，針對(duì)貧困階層的社會(huì)保障單一免费黄色的网址，社會(huì)保障體系缺少促進(jìn)區(qū)域流動(dòng)的政策與措施等方面。

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.

根據(jù)社會(huì)保障制度改革與發(fā)展的目標(biāo)定位亚洲乱色无码一区二区，社會(huì)保障基金籌集應(yīng)當(dāng)堅(jiān)持兼顧社會(huì)目標(biāo)在线小说图片、經(jīng)濟(jì)目標(biāo)和政治目標(biāo)，兼顧長(zhǎng)期目標(biāo)與短期目標(biāo)久久自慰流水喷白浆免费看，實(shí)現(xiàn)公平與效率相結(jié)合毛片永久免费视频；社會(huì)保障基金籌集必須合理劃分政府和單位、個(gè)人之間的責(zé)任邊界50岁熟女，明確政府與市場(chǎng)的合理職能分工亚洲国产一区二区综合；社會(huì)保障基金籌集必須重視宏觀制度方式選擇，同時(shí)也要重視微觀領(lǐng)域的技術(shù)設(shè)計(jì)與應(yīng)用欧美色图片一区；社會(huì)保障基金籌集應(yīng)針對(duì)不同的社會(huì)保障項(xiàng)目采取不同籌集方式手机免费Se黄色电影、籌集途徑；社會(huì)保障基金籌集應(yīng)區(qū)分經(jīng)常性資金需要和臨時(shí)性資金需要采取不同的籌集方式无码日韩网页视频下载、籌集途徑等原則久久99精品免费视频。

I strongly ask US DELL company to command DELL send a new PC to me,it must be the same as the instroction book,I want an English OS and McAfee Security Center,ROM of it should be 1024*3=2072MB,and I can never bear the DELL PC be formated when you take it from the factroy,I want to buy a DELL PC installed Microsoft Windows Vista Home Premium_32bit which never be formated even for 1 time,this is the point which my father announced to you when he bought this DELL PC,you do things against low again,its hard disk's mark should be 5.9,or it can do harm to my eyes' slight more and more,even make my eyes's slight can't be focalized.

我強(qiáng)烈要求整機(jī)更換，更換成完全符合說(shuō)明書(shū)的英文版操作系統(tǒng)和英文版McAfee Security Center东京热婷无码人妻一区二区Av，內(nèi)存應(yīng)該是1024*3=3072MB另外我不能容忍機(jī)器出廠時(shí)候的預(yù)先格式化一级黄色视频毛片，我要求不格式化安裝Windows Vista Home Premium_32bit系統(tǒng)，要求機(jī)器一次也不要格式化激情中文字幕，絕對(duì)一次也不要格式化日本在线观看网站亚洲，這是我爸爸訂購(gòu)機(jī)器的時(shí)候聲明的，你們又一次違反了亚洲全黄网。

I strongly ask US DELL company to command DELL send a new PC to meit must be the same as the instroction bookI want an English OS and McAfee Security CenterROM of it should be 1024*3=2072MBand I can never bear the DELL PC be formated when you take it from the factroyI want to buy a DELL PC installed Microsoft Windows Vista Home Premium_32bit which never be formated even for 1 timethis is the point which my father announced to you when he bought this DELL PCyou do things against low againits hard disk's mark should be 5.9or it can do harm to my eyes' slight more and moreeven make my eyes's slight can't be focalized.

我強(qiáng)烈要求整機(jī)更換更換成完全符合說(shuō)明書(shū)的英文版操作系統(tǒng)和英文版McAfee Security Center內(nèi)存應(yīng)該是1024*3=3072MB另外我不能容忍機(jī)器出廠時(shí)候的預(yù)先格式化我要求不格式化安裝Windows Vista Home Premium_32bit系統(tǒng)要求機(jī)器一次也不要格式化絕對(duì)一次也不要格式化這是我爸爸訂購(gòu)機(jī)器的時(shí)候聲明的你們又一次違反了国产18流白浆视频。

Bandari's mystic sonorities convey a sense of peace and security.

Bandari的神秘sonorities傳達(dá)一個(gè)和平與security。