【摘要】：當(dāng)今在線社交網(wǎng)絡(luò)(Online Social Networks,OSNs)已經(jīng)成為互聯(lián)網(wǎng)應(yīng)用中最普及、用戶數(shù)量最多的平臺,其核心是基于分布式系統(tǒng)的對等網(wǎng)絡(luò)(Peer-to-peer,P2P)技術(shù)。P2P網(wǎng)絡(luò)具有的可拓展性和高傳輸效率的特點,使其逐漸替代了傳統(tǒng)的客戶端/服務(wù)器模式(Client/Server,C/S model)。雖然P2P克服了C/S模式過分依賴中心服務(wù)器從而有可能造成的隱私泄漏和廣告植入等問題,但由于P2P網(wǎng)絡(luò)的開放性以及社交網(wǎng)絡(luò)用戶間的惡意攻擊行為,基于P2P網(wǎng)絡(luò)的社交網(wǎng)絡(luò)仍然存在諸多隱私和安全問題。本論文針對上述問題,首先,深入剖析P2P網(wǎng)絡(luò)安全和加密機(jī)制;其次,較為詳盡地分析社交網(wǎng)絡(luò)中不良結(jié)構(gòu)可能導(dǎo)致的網(wǎng)絡(luò)擁塞以及惡意節(jié)點的攻擊行為,最后提出了一種基于網(wǎng)絡(luò)服務(wù)(Web-Services)的社區(qū)間P2P社交網(wǎng)絡(luò)的安全模型,并對網(wǎng)絡(luò)效率、安全性進(jìn)行了詳細(xì)的討論。主要內(nèi)容有:1.分析了傳統(tǒng)社交網(wǎng)絡(luò)中的加密技術(shù)和抵抗攻擊策略,將廣播加密引入社交網(wǎng)絡(luò)安全模型,利用基于社區(qū)的廣播加密(Community-based Broadcast Encryption)可提高網(wǎng)絡(luò)利用率和OSNs功能實現(xiàn)的便利性。2.在盡可能保證系統(tǒng)和結(jié)構(gòu)安全的情況下,針對社交網(wǎng)絡(luò)中信息格式與信用分級不同的特征,基于多粒度加密(Hierarchical Encryption Algorithms)的安全模型可縮短用于加密的時間開銷近22%,有效提升系統(tǒng)效率。3.研究了P2P社交網(wǎng)絡(luò)的數(shù)據(jù)傳輸安全結(jié)構(gòu),為了改進(jìn)傳統(tǒng)的基于SOAP消息傳輸?shù)膹?fù)雜性和對數(shù)據(jù)格式嚴(yán)格性,利用RESTful網(wǎng)絡(luò)服務(wù)的安全傳輸結(jié)構(gòu)可以實現(xiàn)跨平臺(Cross-platform)數(shù)據(jù)的安全傳輸,從而更好地優(yōu)化了系統(tǒng)的可擴(kuò)展性,并平均提高網(wǎng)絡(luò)傳輸效率近17%.仿真結(jié)果表明,在P2P覆蓋網(wǎng)絡(luò)的社區(qū)內(nèi)使用廣播加密進(jìn)行批量認(rèn)證和加密,當(dāng)用戶規(guī)模超過6,000萬時,系統(tǒng)通信所需時間開銷從約100秒降低至平均79秒,且網(wǎng)絡(luò)波動減小到15%以內(nèi),系統(tǒng)效率和網(wǎng)絡(luò)穩(wěn)定性都得到有效保障。且本文運用的多粒度加密相比于SHA-1散列算法,在用戶量高于10,000時,可縮短平均加密時間5ms。以上結(jié)論表明本文設(shè)計的系統(tǒng)滿足有效性和安全性的設(shè)計目標(biāo)。
[Abstract]:Nowadays, the online social network (Online Social Networks,OSNs) has become the most popular platform with the largest number of users in Internet applications. The core of the platform is the distributed peer-to-peer network (Peer-to-peer,P2P) technology. P2P network has the characteristics of expansibility and high transmission efficiency. Gradually replacing the traditional client / server model (Client/Server,C/S model).) Although P2P overcomes the problems of privacy disclosure and advertising placement caused by the excessive reliance on central servers in the C / S mode, but due to the openness of P2P networks and malicious attacks among users of social networks, There are still many privacy and security problems in social networks based on P2P networks. This paper aims at the above problems, first, deeply analyzes the P2P network security and encryption mechanism; secondly, analyzes the network congestion and malicious node attack behavior caused by the bad structure in the social network in detail. Finally, a P2P social network security model based on Web-Services is proposed, and the network efficiency and security are discussed in detail. The main contents are: 1. This paper analyzes the encryption technology and anti-attack strategy in the traditional social network, introduces broadcast encryption into the social network security model, and makes use of community based broadcast encryption (Community-based Broadcast Encryption) can improve the network utilization and the convenience of OSNs function realization. 2. With as much system and structural security as possible, aiming at the characteristics of different information formats and credit ratings in social networks, The security model based on multi-granularity encryption (Hierarchical Encryption Algorithms) can shorten the time cost of encryption by nearly 22 steps and effectively improve the system efficiency. In order to improve the complexity of traditional message transmission based on SOAP and the strictness of data format, the secure transmission structure of RESTful network service can realize the secure transmission of cross-platform (Cross-platform) data. Thus, the system scalability is optimized, and the network transmission efficiency is improved by nearly 17% on average. The simulation results show that the broadcast encryption is used to authenticate and encrypt in the community of P2P overlay network. When the user size exceeds 60 million, the communication time cost of the system is reduced from about 100 seconds to an average of 79 seconds. The network fluctuation is reduced to less than 15%, and the system efficiency and network stability are effectively guaranteed. Compared with the SHA-1 hash algorithm, the multi-granularity encryption algorithm in this paper can shorten the average encryption time by 5 Ms when the number of users is higher than 10000. The above conclusions show that the system designed in this paper meets the design objectives of effectiveness and security.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP393.08

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