Blockchain Access Control Scheme with SM9-Based Attribute Encryption

doi:10.3969/j.issn.1671-1122.2023.09.004

Abstract

Abstract:

The issue of secure sharing of data in the information society has attracted a lot of attention. The key to secure data sharing is to control the access or use of data through cryptography. However, traditional access control or public key encryption systems have gradually revealed their shortcomings in data sharing, such as the number of access control policies tends to increase with the size of users, which is not easy to manage; the traditional public key encryption system needs to obtain the public key information of each user and send the cipher text one-to-one, which is costly to communicate; relying on third-party service providers to store data carries the risk of a single point of failure, etc. To solve the above problems, the paper introduced distributed technology blockchain and Interplanetary File System (IPFS), and proposed a blockchain access control scheme with SM9-based attribute encryption, which achieved secure and efficient one-to-many data sharing and fine-grained access control, while the blockchain made user data uncompiled and achieved secure storage and auditable data. Finally, the safety of the proposed scheme is proved by the deterministic q-parallel BDHE assumption.

Key words: SM9 algorithm, attribute-based encryption, access control, blockchain

CLC Number:

TP309

ZHOU Quan, CHEN Minhui, WEI Kaijun, ZHENG Yulong. Blockchain Access Control Scheme with SM9-Based Attribute Encryption[J]. Netinfo Security, 2023, 23(9): 37-46.

Figures/Tables 9

References 24

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访问结构(L)	访问矩阵(M)
((a, b, 2),(c, d, 1), e, 2)	(1)
$\left( \begin{matrix} (a,b,2) \\ (c,d,1) \\ e \\ \end{matrix} \right)$	$\left( \begin{matrix} 1 & 1 \\ 1 & 2 \\ 1 & 3 \\ \end{matrix} \right)$
$\left( \begin{matrix} a \\ b \\ (c,d,1) \\ e \\ \end{matrix} \right)$	$\left( \begin{matrix} 1 & 1 & 1 \\ 1 & 1 & 2 \\ 1 & 2 & 0 \\ 1 & 3 & 0 \\ \end{matrix} \right)$
$\left( \begin{matrix} a \\ b \\ c \\ d \\ e \\ \end{matrix} \right)$	$\left( \begin{matrix} 1 & 1 & 1 \\ 1 & 1 & 2 \\ 1 & 2 & 0 \\ 1 & 2 & 0 \\ 1 & 3 & 0 \\ \end{matrix} \right)$

参数符号	含义
k	系统属性集
S	用户属性集
M_i	l×n型访问矩阵M的第i行
$\rho (i)$	将矩阵M的第i行映射到属性
GID	用户组标识
H₁()	密码函数：{0, 1}^→$Z_{p}^{}$
KDF()	密钥派生函数
Enc()	分组函数，使用国密SM4
MAC()	消息认证码函数，使用国密SM3

方案	访问结构	安全存储程度	细粒度的访问控制	区块链	数据共享
文献[20]方案	AND门	弱	弱	×	√
文献[8]方案	访问树	弱	强	×	√
本文方案	LSSS矩阵	强	强	√	√

方案	设置阶段	密钥生成阶段	加密阶段	解密阶段
文献[8]方案	2T_m	nT_h + 2T_inv + (3n+1)T_m+T_H₁	T_H₁ + (2l+2)T_m + T_p + T_e + T_M + T_E	(2l+1)T_p + (l+1)T_inv + 2lT_m + 2lT_e + T_M + T_E
本文方案	2T_m	nT_h + 2T_inv + (n+2)T_m+T_H₁	T_H₁ + (3l+2)T_m + T_p + T_e + T_M + T_E	(2l+1)T_p + T_inv + 2lT_m + lT_e + T_M + T_E