政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/142125

政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/142125

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政大機構典藏 > 資訊學院 > 資訊科學系 > 學位論文 > Item 140.119/142125

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題名:	具可控監管與交易保密功能之區塊鏈支付系統 Blockchain-based Confidential Payment System with Controllable Regulation
作者:	廖御辰 Liao, Yu-Chen
貢獻者:	左瑞麟 Tso, Ray-Lin 廖御辰 Liao, Yu-Chen
關鍵詞:	可歸責性區塊鏈保密交易門檻加密 Accountability Blockchain Confidential transaction Threshold encryption
日期:	2022
上傳時間:	2022-10-05 09:15:19 (UTC+8)
摘要:	基於區塊鏈的支付系統(如比特幣等)，由於其交易可公開驗證的特性而有廣泛的應用。此外，為了保護使用者在區塊鏈上的隱私，如一交易的收發人以及交易金額等，隱私保護貨幣如門羅幣及 Zerocash 等也因此被提出。然而，在缺乏任何監管措施的情形下，過度的隱私保護系統卻有可能遭到惡意的濫用。因此，如何同時兼顧隱私保護但又保有適度的監管能力是一個非常重要的問題。在此篇論文中，我們提出一個具可控監管與交易保密功能之區塊鏈支付系統。為了保護使用者的隱私且同時進行可控監管，我們使用了門檻同態加密系統來對使用者的交易金額進行加密。此加密使用監管者的門檻加密金鑰，在保護交易隱私的同時也限制了監管者對一交易金額進行解密的能力。此外，藉由同態加密的特性，我們能夠在不對交易金額解密的情形下，更新使用者在經過一交易後的餘額，進而達到保持使用者隱私的目的。我們所提出的系統也能滿足安全性的需求，並且我們也實作了此系統的原型用以效能分析。 Blockchain-based payment system (e.g., Bitcoin) is wildly adopted in many scenarios due to the transaction details are publicly accessible. In addition, blockchain-based anonymous payment systems (e.g., Monero and Zerocash) have been proposed to further protect on-chain privacy, such as the balance of the sender and receiver, and the amount of the transaction. However, without any regulation, overly privacy-preserving systems will sometimes be abused for malicious behavior. How to strike a balance between the needs for regulation and privacy become a important issue on such systems. In this paper, we proposed a blockchain-based confidential payment system with controllable regulation. To protect user’s privacy as well as perform controllable regulation, we realized the proposed system by utilizing threshold homomorphic encryption to encrypt user’s transaction values and balance. The encryption is done with regulators’ thresholdized keys and thus limits regulators’ ability to decrypt a transaction. In addition, with the homomorphic property, we can update the user’s balance without decrypting the transaction value or the user’s balance and thus preserve on-chain privacy. The proposed system also satisfies the security requirements and and a prototype implementation is provided for the performance analysis.
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The AZTEC protocol. https://raw.githubusercontent.com/ AztecProtocol/AZTEC/master/AZTEC.pdf. 2018 (cit. p. 4). [WOD18]Rolf van Wegberg, Jan-Jaap Oerlemans, and Oskar van Deventer. “Bitcoin money laundering: Mixed results? An explorative study on money laundering of cybercrime proceeds using Bitcoin.” In: J. Financial Crime. Emerald Publishing Limited. 2018, pp. 419–435 (cit. p. 2). [XLN+ 22]Liang Xue, Dongxiao Liu, Jianbing Ni, Xiaodong Lin, and Xuemin Sherman Shen. “Enabling regulatory compliance and enforcement in decentralized anonymous payment.” In: IEEE Trans. Dependable Secur. Comput. IEEE. 2022 (cit. p. 5).
描述:	碩士國立政治大學資訊科學系 109753124
資料來源:	http://thesis.lib.nccu.edu.tw/record/#G0109753124
資料類型:	thesis
DOI:	10.6814/NCCU202201524
顯示於類別:	[資訊科學系] 學位論文

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