發(fā)布時(shí)間：2018-08-05 09:58

【摘要】：隨著數(shù)據(jù)量的爆炸性增長(zhǎng),數(shù)據(jù)存儲(chǔ)問(wèn)題變得愈加獨(dú)立與棘手。云計(jì)算中的存儲(chǔ)服務(wù)正是迎合了這一市場(chǎng)契機(jī),向資源有限的多租戶提供數(shù)據(jù)的外包存儲(chǔ)解決方案。在云存儲(chǔ)中,用戶將數(shù)據(jù)存儲(chǔ)在遠(yuǎn)程云服務(wù)器上,并由云服務(wù)提供商對(duì)其進(jìn)行操作處理。然而,云服務(wù)提供商受利益的驅(qū)使會(huì)在半可信模式或者惡意模式下工作。這就使得用戶在外包存儲(chǔ)時(shí)迫切希望云存儲(chǔ)系統(tǒng)能夠具有隱私保護(hù)的功能,以防止外包數(shù)據(jù)的非授權(quán)共享。因此,如何實(shí)現(xiàn)多個(gè)用戶在云存儲(chǔ)模式下進(jìn)行高效靈活的數(shù)據(jù)安全共享變成了一個(gè)亟待解決的問(wèn)題。本文從密文域訪問(wèn)控制中的等級(jí)密鑰管理和屬性基加密兩種方法對(duì)上述問(wèn)題展開(kāi)研究,主要取得了如下研究成果:(1)針對(duì)用戶共享權(quán)限動(dòng)態(tài)變化的云外包數(shù)據(jù)細(xì)粒度共享問(wèn)題,多權(quán)利群組密鑰管理和等級(jí)密鑰管理都需要數(shù)據(jù)擁有者自己更新系統(tǒng)中的某些公開(kāi)參數(shù)。除此之外,基于等級(jí)密鑰管理的解決方案還要求數(shù)據(jù)擁有者通過(guò)安全信道與涉及到的各個(gè)訪問(wèn)群組中用戶進(jìn)行一對(duì)一通信。一旦訪問(wèn)群組的等級(jí)結(jié)構(gòu)較為復(fù)雜且涉及到的用戶數(shù)目較多,這一更新過(guò)程會(huì)有單點(diǎn)失敗的風(fēng)險(xiǎn)。為了避免這一缺陷,我們提出了一個(gè)面向外包數(shù)據(jù)共享的自主型等級(jí)密鑰管理方案。該方案融合了多權(quán)利群組密鑰管理和等級(jí)密鑰管理各自設(shè)計(jì)上的優(yōu)勢(shì)。其主要特征是數(shù)據(jù)擁有者只通過(guò)系統(tǒng)公開(kāi)參數(shù)對(duì)各個(gè)訪問(wèn)群組的等級(jí)結(jié)構(gòu)進(jìn)行管理。而各個(gè)訪問(wèn)群組中的用戶以基于多線性映射的群組密鑰協(xié)商方式獲得所在群組對(duì)應(yīng)的對(duì)稱加密密鑰。一旦發(fā)生用戶共享權(quán)限的動(dòng)態(tài)變化,數(shù)據(jù)擁有者和相應(yīng)的高等級(jí)訪問(wèn)群組中用戶均可以為涉及到的低等級(jí)訪問(wèn)群組中用戶發(fā)布更新信息。獲得這更新信息后,這些低等級(jí)訪問(wèn)群組中用戶可以自主計(jì)算所在群組對(duì)應(yīng)的新的對(duì)稱加密密鑰。(2)目前,安全且具有直接密鑰派生的等級(jí)密鑰管理方案需要對(duì)系統(tǒng)中的公開(kāi)信息進(jìn)行加密處理。這會(huì)增加系統(tǒng)建立與動(dòng)態(tài)密鑰管理的計(jì)算開(kāi)銷。通過(guò)使用線性幾何中向量?jī)?nèi)積處理群組間的等級(jí)結(jié)構(gòu),我們給出了一個(gè)基于等級(jí)密鑰管理的云外包數(shù)據(jù)安全共享解決方案。在該方案中,數(shù)據(jù)擁有者為每個(gè)訪問(wèn)群組公開(kāi)一個(gè)向量,且所有向量組成的矩陣是系統(tǒng)的主要公開(kāi)參數(shù)。與此同時(shí),數(shù)據(jù)擁有者為各個(gè)用戶分配所在群組對(duì)應(yīng)的私有信息。通過(guò)該私有信息,訪問(wèn)群組中的用戶能夠計(jì)算出所在群組對(duì)應(yīng)的私有向量。再計(jì)算這個(gè)私鑰向量與所在群組對(duì)應(yīng)的公開(kāi)向量的內(nèi)積,訪問(wèn)群組中的用戶便可獲得所在群組對(duì)應(yīng)的對(duì)稱加密密鑰。如果兩個(gè)訪問(wèn)群組不具有等級(jí)關(guān)系,則與它們相關(guān)聯(lián)的向量會(huì)存在正交性,也就是向量?jī)?nèi)積為零。如果這兩個(gè)訪問(wèn)群組具有等級(jí)關(guān)系,則高等級(jí)訪問(wèn)群組的私有向量與低等級(jí)訪問(wèn)群組的公開(kāi)向量的內(nèi)積對(duì)應(yīng)一個(gè)間接密鑰。利用該間接密鑰,高等級(jí)訪問(wèn)群組中的用戶可以獲得低等級(jí)訪問(wèn)群組對(duì)應(yīng)的對(duì)稱加密密鑰。在動(dòng)態(tài)共享權(quán)限對(duì)應(yīng)的密鑰管理方面,數(shù)據(jù)擁有者只需要更新系統(tǒng)中的公開(kāi)矩陣即可。通過(guò)安全性分析和仿真實(shí)驗(yàn)結(jié)果,我們可以看出該方案是安全且高效的。(3)面對(duì)多授權(quán)中心的云存儲(chǔ)系統(tǒng),我們提出了一個(gè)雙因素的外包數(shù)據(jù)共享解決方案。該方案集成了身份基加密與密文策略的屬性基加密兩種技術(shù)。一個(gè)用戶能夠獲取到數(shù)據(jù)擁有者的共享數(shù)據(jù),除了其擁有的屬性集合滿足密文中的訪問(wèn)控制策略以外,還要求該用戶從數(shù)據(jù)擁有者那里獲得了授權(quán)密鑰。另外,我們提出的方案還具有固定密文長(zhǎng)度這一性質(zhì)。利用云服務(wù)器輔助性重加密技術(shù),該方案實(shí)現(xiàn)了雙層撤銷機(jī)制:屬性授權(quán)中心對(duì)應(yīng)的屬性層撤銷和數(shù)據(jù)擁有者對(duì)應(yīng)的用戶層撤銷。并且,撤銷過(guò)程是在公開(kāi)信道下完成的,能夠抵抗撤銷用戶的信道竊聽(tīng)攻擊。安全性分析、性能對(duì)比以及仿真結(jié)果表明該方案在解決多授權(quán)中心下的云外包數(shù)據(jù)安全共享問(wèn)題上是有效的。
[Abstract]:With the explosive growth of data, the problem of data storage becomes more and more independent and difficult. The storage service in the cloud computing is just to cater to this market opportunity to provide an outsourced storage solution to a resource limited multi tenant. In the cloud storage, the user stores the data on a remote cloud server and is provided by a cloud service provider. However, the benefit of cloud service providers is driven to work in a semi trusted or malicious mode, which makes it urgent for the user to have the privacy protection function of the cloud storage system to prevent unauthorized sharing of outsourced data in the outsourced storage. Efficient and flexible data security sharing has become an urgent problem to be solved. This paper studies the above problems from two methods of hierarchical key management and attribute based encryption in cipher domain access control. The main achievements are as follows: (1) the fine granularity of cloud outsourced data for the dynamic changes of the user shared privileges. In addition, the hierarchical key management solution also requires the data owner to communicate one to one communication with the users involved in the various access groups through the secure channel. Once access to the group, the data owner is required to access the group. In order to avoid this defect, we propose an autonomous hierarchical key management scheme for outsourced data sharing. This scheme combines multiple rights group key management and hierarchical key management in each design. The main feature is that the data owner manages the hierarchical structure of each access group only through the public parameters of the system, and the users in each of the access groups obtain the symmetric encryption key corresponding to the group by the group key negotiation based on the multilinear mapping. Users and users of the corresponding high level access groups can publish update information for users in the low level access group involved. After obtaining this update, these low-level access groups can independently compute the new symmetric encryption keys corresponding to their groups. (2) currently, it is safe and has a direct key derivative. The hierarchical key management scheme needs to encrypt the public information in the system. This will increase the computing overhead of the system establishment and dynamic key management. By using the vector product in linear geometry to process the hierarchical structure between groups, we give a solution for the security sharing of cloud outsourced data based on the hierarchical key management. In this scheme, the data owner exposes a vector for each access group, and the matrix of all the vectors is the main public parameter of the system. At the same time, the data owner assigns the corresponding private information to the group for each user. Through the private information, the users in the group can calculate the corresponding privacy of the group. There is a vector. Then we calculate the inner product of the private key vector and the public vector corresponding to the group. The users in the group can get the symmetric encryption keys corresponding to the group. If two groups of access groups do not have a hierarchical relationship, the vectors associated with them will have orthogonality, that is, the inner product of the vectors is zero. If the two The access group has a hierarchical relationship, and the private vector of the high level access group and the inner product of the public vector of the low level access group correspond to an indirect key. Using this indirect key, the users in the high level access group can obtain the symmetric plus secret key of the low level access group corresponding to the key pipe of the dynamic sharing rights. On the other hand, the data owner only needs to update the public matrix in the system. Through the security analysis and simulation results, we can see that the scheme is safe and efficient. (3) in the face of the cloud storage system in the multi authorization center, we propose a dual factor outsourcing data sharing solution. This scheme integrates the identity base. Two techniques of encryption and cipher based attribute based encryption. One user can obtain the shared data of the owner of the data. Besides the access control strategy in the ciphertext, the user also requires that the user obtain the authorization key from the data owner. Furthermore, the proposed scheme also has a fixed cipher length. By using cloud server aided re encryption technology, the scheme implements a double decker revocation mechanism: attribute layer revocation corresponding to attribute authorization center and user layer cancellation corresponding to data owner. And the revocation process is completed under the open channel, and can resist the channel eavesdropping attack of the revocation user. Security analysis, performance The comparison and simulation results show that the scheme is effective in solving the problem of cloud outsourcing data security sharing under multiple authorization centers.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN918.4

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