發(fā)布時(shí)間：2019-05-07 06:09

【摘要】：隨著互聯(lián)網(wǎng)技術(shù)和通信技術(shù)的不斷發(fā)展,網(wǎng)絡(luò)已經(jīng)融入到人們生活的方方面面,給人們的生活帶來(lái)了極大的方便。但是與此同時(shí),各種網(wǎng)絡(luò)攻擊手段層出不窮,網(wǎng)絡(luò)空間的安全受到極大的威脅。因此,我們需要各種網(wǎng)絡(luò)防御技術(shù)來(lái)抵御網(wǎng)絡(luò)攻擊。防火墻技術(shù)是抵御網(wǎng)絡(luò)攻擊、保障網(wǎng)絡(luò)安全的關(guān)鍵技術(shù)之一。防火墻可以監(jiān)視和檢查傳入和傳出內(nèi)網(wǎng)的網(wǎng)絡(luò)流量,阻止攻擊者的惡意分組數(shù)據(jù)包進(jìn)入到內(nèi)網(wǎng),將惡意的分組數(shù)據(jù)包扼殺在內(nèi)網(wǎng)的入口。但是部署和管理防火墻會(huì)帶來(lái)很大的開(kāi)銷(xiāo),這會(huì)增加公司的經(jīng)營(yíng)成本。為了減少公司的開(kāi)銷(xiāo),公司開(kāi)始考慮將防火墻功能外包給云服務(wù)提供商去處理。然而防火墻功能外包會(huì)泄露公司的防火墻策略,現(xiàn)有的防火墻功能外包方案要么不保護(hù)防火墻策略的隱私,要么就是性能或者安全性不高,這使得防火墻策略的隱私保護(hù)問(wèn)題成為了公司采用防火墻功能外包技術(shù)的阻礙。本文旨在解決防火墻功能外包中防火墻策略的隱私保護(hù)問(wèn)題。具體研究?jī)?nèi)容包括如下幾個(gè)方面:1.提出一種基于雙云的防火墻功能外包的系統(tǒng)架構(gòu)。針對(duì)現(xiàn)有的防火墻功能外包系統(tǒng)架構(gòu)中存在的問(wèn)題,我們提出了一種基于兩個(gè)相互獨(dú)立的云平臺(tái)的防火墻功能外包的系統(tǒng)架構(gòu)。這個(gè)系統(tǒng)架構(gòu)中兩個(gè)云平臺(tái),相互獨(dú)立同時(shí)又能遵循協(xié)議共同提供防火墻功能的外包服務(wù)。2.基于上述的雙云的外包系統(tǒng)架構(gòu),利用Paillier部分同態(tài)加密提出一種隱私保護(hù)的防火墻功能外包方案。這個(gè)方案中我們將Paillier部分同態(tài)加密和密碼學(xué)模糊器結(jié)合起來(lái),設(shè)計(jì)了一個(gè)基于Paillier部分同態(tài)加密的密碼學(xué)模糊器,然后使用這個(gè)密碼學(xué)模糊器去模糊化防火墻策略,從而保證外包出去的防火墻策略的隱私。3.基于流量重定向的外包系統(tǒng)架構(gòu),利用前綴保持加密提出一種隱私保護(hù)的防火墻功能外包方案。這個(gè)方案使用前綴保持加密算法加密防火墻策略,從而保證外包的防火墻策略的隱私。4.使用Click模塊化路由器分別實(shí)現(xiàn)了上述兩個(gè)方案的仿真實(shí)驗(yàn),驗(yàn)證了提出的方案的可行性。同時(shí)我們測(cè)試了兩個(gè)方案的處理延時(shí)與吞吐量?jī)蓚�(gè)指標(biāo),驗(yàn)證了這兩個(gè)方案的性能。
[Abstract]:With the continuous development of Internet technology and communication technology, network has been integrated into all aspects of people's lives, which brings great convenience to people's lives. But at the same time, a variety of cyber attacks emerge one after another, and the security of cyberspace is greatly threatened. Therefore, we need a variety of network defense technology to resist network attacks. Firewall technology is one of the key technologies to resist network attack and guarantee network security. The firewall can monitor and check the incoming and outgoing network traffic, prevent the malicious packet from entering the intranet, and kill the malicious packet at the entrance of the intranet. But deploying and managing firewalls brings a lot of overhead, which increases the company's operating costs. To reduce the company's overhead, the company began to consider outsourcing firewall capabilities to cloud service providers to handle. However, firewall function outsourcing will reveal the company's firewall policy, the existing firewall function outsourcing scheme either does not protect the privacy of the firewall policy, or the performance or security is not high. This makes the privacy protection of firewall policy become a hindrance to the company adopting firewall function outsourcing technology. The purpose of this paper is to solve the privacy protection problem of firewall policy in firewall function outsourcing. The specific contents of the study include the following aspects: 1. This paper presents a dual cloud-based firewall function outsourcing system architecture. In view of the problems existing in the existing firewall function outsourcing system architecture, we propose a firewall function outsourcing system architecture based on two independent cloud platforms. The two cloud platforms in this system architecture are independent of each other and can provide firewall functions in accordance with the protocol. 2. Based on the above-mentioned dual-cloud outsourcing system architecture, a privacy-protected firewall outsourcing scheme is proposed by using Paillier partial homomorphism encryption. In this scheme, we combine Paillier partial homomorphism encryption with cryptology fuzzizer, design a cryptology fuzzer based on Paillier partial homomorphism encryption, and then use this cryptology fuzzizer to defuzzify firewall strategy. Thus ensuring the privacy of the outsourced firewall policy. 3. Based on the outsourced system architecture of traffic redirection, a privacy-protected firewall outsourcing scheme is proposed by using prefix-preserving encryption. This scheme uses prefix-preserving encryption algorithms to encrypt firewall policies, thus ensuring the privacy of outsourced firewall policies. 4. The simulation experiments of the above two schemes are carried out by using Click modular router, and the feasibility of the proposed scheme is verified. At the same time, we test the processing delay and throughput of the two schemes, and verify the performance of the two schemes.
【學(xué)位授予單位】：中國(guó)科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TP393.08

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