Vol.2, No.1, 2020, pp.57-83, doi:10.32604/jqc.2020.09291
OPEN ACCESS
ARTICLE
Cipherchain: A Secure and Efficient Ciphertext Blockchain via mPECK
  • Hailin Chen1, Gang Xu3, Yuling Chen2, Xiubo Chen1, 2, *, Yixian Yang1, 2, Ruibin Fan4, Kaixiang Zhang4, Huizhong Li4
1 Information Security Center, State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, 100876, China.
2 Guizhou University, Sate Key Laboratory of Public Big Data, Guizhou, 550025, China.
3 North China University of Technology, School of Computing Science and Technology, Beijing, China.
4 Webank, Shenzhen, 518000, China.
* Corresponding Author: Xiubo Chen. Email: flyover100@163.com.
Received 29 November 2019; Accepted 14 December 2019; Issue published 28 May 2020
Abstract
Most existing blockchain schemes are based on the design concept “openness and transparency” to realize data security, which usually require transaction data to be presented in the form of plaintext. However, it inevitably brings the issues with respect to data privacy and operating performance. In this paper, we proposed a novel blockchain scheme called Cipherchain, which can process and maintain transaction data in the form of ciphertext while the characteristics of immutability and auditability are guaranteed. Specifically in our scheme, transactions can be encrypted locally based on a searchable encryption scheme called multi-user public key encryption with conjunctive keyword search (mPECK), and can be accessed by multiple specific participants after appended to the globally consistent distributed ledger. By introducing execution-consensus-update paradigm of transaction flow, Cipherchain cannot only make it possible for transaction data to exist in the form of ciphertext, but also guarantee the overall system performance not greatly affected by cryptographic operations and other local execution work. In addition, Cipherchain is a promising scheme to realize the technology combination of “blockchain+cloud computing” and “permissioned blockchain+public blockchain”.
Keywords
Blockchain, Cipherchain, cloud computing, mPECK.
Cite This Article
Chen, H., Xu, G., Chen, Y., Chen, X., Yang, Y. et al. (2020). Cipherchain: A Secure and Efficient Ciphertext Blockchain via mPECK. Journal of Quantum Computing, 2(1), 57–83.