Blockchain-based Mechanism for Judicial Data Management and Electronic Evidence Storage

doi:10.3969/j.issn.1671-1122.2022.02.003

Abstract

Abstract:

According to the requirements of judicial data classification, entity types and storage and sharing of electronic evidence in practical application, combined with blockchain technology and fully considering its security and efficiency, this paper proposed a blockchain-based structure for secure storage of electronic evidence in judicial scene. With complete node authentication scheme and block generation process, this structure is composed of a judiciary alliance chain called JudChain and a storage chain for electronic evidence named EviChain, which realized efficient management and secure storage of judicial data and electronic evidence. Furthermore, this paper proposed a consensus protocol applied to JudChain, which comprehensively improves the traditional PBFT algorithm to reduce consensus overhead and transaction delay, and improve consensus efficiency and throughput.

Key words: blockchain, electronic evidence, data storage, consensus mechanism, practical Byzantine fault tolerance

CLC Number:

TP309

WANG Jian, ZHANG Yunjia, LIU Jiqiang, CHEN Zhihao. Blockchain-based Mechanism for Judicial Data Management and Electronic Evidence Storage[J]. Netinfo Security, 2022, 22(2): 21-31.

Figures/Tables 16

References 26

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符号	含义
x_i	节点i的私钥
y_i	节点i的公钥
ID_i	节点i的身份标识符
PK_i	权威节点i的属性公钥
MSK_i	权威节点i的属性主密钥

符号	含义
Client	共识算法请求节点
Mnode	共识算法主节点
Bnode_i	共识算法备份节点i
n_i_-_j	节点i与节点j间的双向秘密参数
a	系统定义的序列号低水线
A	系统定义的序列号高水线
q_i	节点i针对请求的回复结果
Q_i	节点i针对请求的回复验证参数
f	系统允许的恶意节点数量最大值

机构	高级/省自治区直辖市级	中级/地级以上市级	基层/县级
人民检察院	0	3	6
人民法院	1	4	7
公安机关	2	5	8

符号	含义
NUM_i	案件i的案件号
Encrypted(i)	对i进行对称加密
K_i	案件i使用的对称密钥
Metadata(i)	i的元数据
Owner_i	证据i的生成者
TYPE_i	证据i的文件类型
NAME_i	证据i的文件名称
TIME_i	证据i的生成时间
POS_i	证据i的生成地点
PARTIES_i	证据i涉及的相关实体
Sig_i	节点i的数字签名
Hash(i)	对i进行哈希计算

安全指标	本文方案	文献[14]方案
去中心化	√	×
不可伪造性	√	√
安全存储	√	√
不可分辨性	√	×
已知密钥安全	√	×