BSSPD: A Blockchain-Based Security Sharing Scheme for Personal Data with Fine-Grained Access Control

Table 1

The symbols and abbreviations involved in this paper.

No.	Symbol	Description
1	DO	The data owner
2	DU	The data user
3	MSK	System master key
4	PK	System public parameters
5	S	All general attributes set
6		The attributes set of a specific DU
7		Access policy
8	uid	A user ID which is unique
9		The attribute private key of DU whose ID is uid
10		The secret key of DU for search
11		An asymmetric encryption algorithm like ECC
12		A pair of keys for algorithm
13		A symmetric encryption algorithm like AES
14	F	Data that the DO intends to share
15	CF	Ciphertext of the data
16		The address where the data is stored on IPFS
17	kw	Keyword
18		Search token of kw