【摘要】：網(wǎng)絡(luò)編碼允許節(jié)點(diǎn)對(duì)多個(gè)數(shù)據(jù)包進(jìn)行運(yùn)算編碼,當(dāng)接收節(jié)點(diǎn)收到足夠數(shù)量的編碼包后,可以應(yīng)用相應(yīng)的編碼系數(shù)進(jìn)行解碼。相關(guān)研究表明,當(dāng)網(wǎng)絡(luò)編碼被應(yīng)用于組播及無線網(wǎng)絡(luò)傳輸時(shí),可以有效提高吞吐量。近年來出現(xiàn)了多種網(wǎng)絡(luò)編碼方案及將網(wǎng)絡(luò)編碼應(yīng)用于傳輸和存儲(chǔ)方面的研究。本文主要針對(duì)多代混合網(wǎng)絡(luò)編碼方案性能及網(wǎng)絡(luò)編碼云存儲(chǔ)方案進(jìn)行了相關(guān)的研究。具體研究工作如下： 分析了現(xiàn)有的單代網(wǎng)絡(luò)編碼和多代混合網(wǎng)絡(luò)編碼這兩種方案的基本思想和實(shí)現(xiàn)步驟,從理論上分析并得到了在無線有損網(wǎng)絡(luò)環(huán)境中,兩種編碼方案的解碼率計(jì)算公式。結(jié)果表明解碼率與代的大小、冗余數(shù)據(jù)包多少、冗余數(shù)據(jù)包的發(fā)送方式、鏈路丟包率、混合集大小有關(guān)；相同的代大小、鏈路丟包率、鏈路長度下,用同樣的發(fā)送冗余,多代混合網(wǎng)絡(luò)編碼方案取得的平均解碼率高于單代網(wǎng)絡(luò)編碼方案,在多代混合網(wǎng)絡(luò)編碼方案中,同一編碼混合集中低代數(shù)據(jù)的解碼率高于高代數(shù)據(jù)的解碼率。模擬實(shí)驗(yàn)測試驗(yàn)證了理論分析的正確性。 提出了一種支持?jǐn)?shù)據(jù)隱私保護(hù)的網(wǎng)絡(luò)編碼云存儲(chǔ)方案,該方案可以同時(shí)保證用戶數(shù)據(jù)的隱私性、完整性、可修復(fù)性、可檢索性。通過對(duì)數(shù)據(jù)進(jìn)行網(wǎng)絡(luò)編碼存儲(chǔ)可以保證用戶數(shù)據(jù)的隱私性；通過引入第三方為用戶數(shù)據(jù)進(jìn)行完整性校驗(yàn)保證了用戶數(shù)據(jù)的完整性,且該過程不需要用戶的參與；在完整性校驗(yàn)過程中發(fā)現(xiàn)有數(shù)據(jù)損壞或丟失時(shí),能及時(shí)對(duì)丟失的數(shù)據(jù)進(jìn)行恢復(fù),從而保證了系統(tǒng)的可靠性；該方案還為用戶文件建立關(guān)鍵詞索引并對(duì)索引采取可檢索加密,使得用戶在不泄露任何關(guān)鍵詞和文件其他內(nèi)容條件下,完成文件的檢索。圖24副,表2個(gè),參考文獻(xiàn)56篇。
[Abstract]:Network coding allows nodes to code multiple packets. When a sufficient number of packets are received by the receiving node, the corresponding encoding coefficients can be applied to decode. Related studies show that when network coding is applied to multicast and wireless network transmission, it can effectively improve throughput. In recent years, a variety of network coding schemes and the application of network coding to transmission and storage have emerged. This paper mainly focuses on the performance of multi-generation hybrid network coding scheme and network coding cloud storage scheme. The research work is as follows: the basic ideas and implementation steps of the existing single-generation network coding and multi-generation hybrid network coding are analyzed and analyzed theoretically in wireless lossy network environment. The calculation formula of decoding rate of two coding schemes. The results show that the decoding rate is related to the generation size, the number of redundant packets, the transmission mode of redundant packets, the packet loss rate of link, the size of mixed set, the same generation size, the loss rate of link, and the redundancy of transmission under the same length of link. The average decoding rate of the multi-generation hybrid network coding scheme is higher than that of the single-generation network coding scheme. In the multi-generation hybrid network coding scheme, the decoding rate of the low-generation data in the same coded hybrid set is higher than that of the high-generation data. The correctness of the theoretical analysis is verified by the simulation experiment. A network coded cloud storage scheme supporting data privacy protection is proposed. This scheme can guarantee the privacy integrity repairable and retrievability of user data at the same time. The privacy of user data can be guaranteed by network coding storage of data, the integrity of user data is ensured by introducing a third party to verify the integrity of user data, and the user's participation is not required in the process. When the data is damaged or lost in the process of integrity verification, the lost data can be recovered in time to ensure the reliability of the system, and the key word index of the user file and the index can be indexed and encrypted. Allows users to complete the retrieval of files without revealing any keywords and other contents of the document. Fig24 pairs, 2 tables, 56 references.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TP333;TN915.01

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