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研究生： Denny Gozali Purnomo
Denny Gozali Purnomo
論文名稱： Private Data Sharing Platform Using Ciphertext-Policy Attribute-Based Encryption with Blockchain Network
Private Data Sharing Platform Using Ciphertext-Policy Attribute-Based Encryption with Blockchain Network
指導教授： 羅乃維
Nai-Wei Lo
口試委員: 楊傳凱
Chuan-Kai Yang
查士朝
Shi-Cho Cha
學位類別： 碩士
Master
系所名稱： 管理學院 - 資訊管理系
Department of Information Management
論文出版年： 2019
畢業學年度： 107
語文別： 英文
論文頁數： 65
中文關鍵詞： Private Data 、Buying-Selling Platform 、Ciphertext-Policy Attribute-Based Encryption 、Cloud Storage 、Blockchain
外文關鍵詞： Private Data, Buying-Selling Platform, Ciphertext-Policy Attribute-Based Encryption, Cloud Storage, Blockchain
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    • In these several years, the knowledge finding from big data keeps growing. Big companies or organization try to get an accurate prediction for their customer or targeted customer. The privacy of customer can be abused by the companies and also not get another benefit from the data that already provided to companies. In this thesis, we propose a private data buying-selling platform that not only secure but also can protect the user's identity. Utilizing ciphertext-policy attribute-based encryption for securing private data. Also uses a blockchain framework to create anonymity of user and securing transaction using a decentralized method. Moreover, our proposed platform is also proven to be secure and could withstand some well-known attacks.

    In these several years, the knowledge finding from big data keeps growing. Big companies or organization try to get an accurate prediction for their customer or targeted customer. The privacy of customer can be abused by the companies and also not get another benefit from the data that already provided to companies. In this thesis, we propose a private data buying-selling platform that not only secure but also can protect the user's identity. Utilizing ciphertext-policy attribute-based encryption for securing private data. Also uses a blockchain framework to create anonymity of user and securing transaction using a decentralized method. Moreover, our proposed platform is also proven to be secure and could withstand some well-known attacks.

    Recommendation Letter . . . . . . . . . . . . . . . . . . . . . . . . i Approval Letter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .viii List of Pseudocodes . . . . . . . . . . . . . . . . . . . . . . . . . . . ix 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Literature Review . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 Blockchain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Cloud computing . . . . . . . . . . . . . . . . . . . . . . . . . .6 2.3 Attribute-based encryption . . . . . . . . . . . . . . . . 8 2.4 Private data sharing . . . . . . . . . . . . . . . . . . . . . . . 10 3 System Environment and Protocol Designs . . . 12 3.1 Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.2 Architecture Design . . . . . . . . . . . . . . . . . . . . . . . 13 3.3 Access Tree Structure Design . . . . . . . . . . . . . . . 20 3.4 Transaction Data Structure Design . . . . . . . . . . 22 3.5 Protocol Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.5.1 Protocol Initialization . . . . . . . . . . . . . . . . . . . . . 25 3.5.2 Seller’s Master Key Generator Protocol . . 28 3.5.3 Data Uploading Protocol . . . . . . . . . . . . . . . . . . 29 3.5.4 Data Purchasing Protocol . . . . . . . . . . . . . . . . . 34 3.5.5 Data Downloading Protocol . . . . . . . . . . . . . . . 37 4 Prototype Design and Implementation . . . . . . . . 42 4.1 Prototype Design . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4.1.1 Key Exchange Procedure . . . . . . . . . . . . . . . . . . 42 4.1.2 Attribute Based Encryption and Decryption Function 45 4.2 Prototype Implementation . . . . . . . . . . . . . . . . . . . 46 5 Security and Performance Analyses . . . . . . . . . . . . . 47 5.1 Informal Security Analysis . . . . . . . . . . . . . . . . . . . . 47 5.2 Performance Analysis . . . . . . . . . . . . . . . . . . . . . . . . 50 5.3 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 6 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

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