@Article{jqc.2020.09291,
AUTHOR = {Hailin Chen, Gang Xu, Yuling Chen, Xiubo Chen, Yixian Yang, Ruibin Fan, Kaixiang Zhang, Huizhong Li},
TITLE = {Cipherchain: A Secure and Efficient Ciphertext Blockchain  via mPECK},
JOURNAL = {Journal of Quantum Computing},
VOLUME = {2},
YEAR = {2020},
NUMBER = {1},
PAGES = {57--83},
URL = {http://www.techscience.com/jqc/v2n1/39238},
ISSN = {2579-0145},
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”.},
DOI = {10.32604/jqc.2020.09291}
}