隨著現(xiàn)代社會(huì)中大數(shù)據(jù)的迅速發(fā)展,越來越多的用戶與企業(yè)選擇將數(shù)據(jù)存放在云服務(wù)器中,并通過云服務(wù)器來進(jìn)行數(shù)據(jù)共享,將數(shù)據(jù)共享給指定的其他用戶。然而,云服務(wù)器存在著安全性的問題,隨時(shí)可能遭到攻擊,影響數(shù)據(jù)的安全性;同時(shí),云服務(wù)提供商有可能獲取用戶的隱私數(shù)據(jù),同樣影響數(shù)據(jù)的安全性。為了保證終端用戶存儲(chǔ)在云服務(wù)器中數(shù)據(jù)的安全,需要設(shè)計(jì)一種可以保護(hù)用戶數(shù)據(jù)不泄露給云服務(wù)商和外部攻擊者的方案。在這樣的應(yīng)用環(huán)境下對(duì)于該方案的設(shè)計(jì),是一個(gè)亟需解決的問題。屬性加密方案（ABE）是一種公鑰加密體制,適用于對(duì)數(shù)據(jù)進(jìn)行加密并控制用戶對(duì)密文的訪問。屬性加密方案提供了一種控制用戶訪問密文的方法,即通過細(xì)粒度的訪問策略與屬性集的匹配來判定用戶能否訪問。這種靈活的訪問策略使得屬性加密在政府和商業(yè)中有著非常好的應(yīng)用環(huán)境。然而,目前的屬性加密方案在投入實(shí)際應(yīng)用前仍然存在三個(gè)方面的問題,即用戶撤銷問題,密文策略更新問題和解密計(jì)算外包問題。本文通過對(duì)Lewko等人提出的基于密文策略的屬性加密方案的改進(jìn),結(jié)合了Boneh等人的中介密碼學(xué)思想,設(shè)計(jì)了具有安全中介員的基于密文策略的屬性加密方案,支持實(shí)時(shí)的用戶撤銷。同時(shí),在引入安全中... 

【文章來源】：哈爾濱工業(yè)大學(xué)黑龍江省 211工程院校 985工程院校

【文章頁數(shù)】：67 頁

【學(xué)位級(jí)別】：碩士

【文章目錄】：
摘要
Abstract
Acknowledgements
Nomenclature
1. Introduction
    1.1 Background
    1.2 Related work
        1.2.1 Attribute based encryption（ABE）
        1.2.2 ABE with user revocation
        1.2.3 ABE with policy updating
        1.2.4 ABE with decryption outsourcing
    1.3 Main content of research and the structure of dissertation
        1.3.1 Main content of research
        1.3.2 Structure of dissertation
2. Preliminaries
    2.1 Ciphertext-policy attribute based encryption
        2.1.1 CP-ABE model
        2.1.2 Security model for CP-ABE
    2.2 Bilinear maps
    2.3 Decisional parallel BDHE assumption
    2.4 Linear secret sharing scheme
    2.5 Composite order bilinear groups
    2.6 Dual system encryption
    2.7 Brief summary of this chapter
3. CP-ABE with Security Mediator
    3.1 Definition
    3.2 Construction
    3.3 User revocation
    3.4 Policy update
        3.4.1 Policy updating
        3.4.2 Proof of correctness
    3.5 Decryption computation outsourcing
    3.6 Brief summary of this chapter
4. Security Proof of CP-ABE with SEM
    4.1 Security model of CP-ABE with SEM
    4.2 Proof of security
        4.2.1 Proof of Theorem
        4.2.2 Proof of Theorem 2
    4.3 Brief summary of this chapter
5. Implementation of CP-ABE with SEM
    5.1 Overview
    5.2 Development environment, results and analysis
    5.3 Comparison of CP-ABE
    5.4 Decrypt time analysis
    5.5 Brief summary of this chapter
Conclusion
References
攻讀博士學(xué)位期間發(fā)表的論文及其它成果


【參考文獻(xiàn)】：
期刊論文
[1]Fully Secure Revocable Attribute-Based Encryption[J]. 錢俊磊,董曉蕾.  Journal of Shanghai Jiaotong University（Science）. 2011(04)



本文編號(hào)：2989977