BFR-SE: A Blockchain-Based Fair and Reliable Searchable Encryption Scheme for IoT with Fine-Grained Access Control in Cloud Environment

Table 1

The symbols and abbreviations involved in this paper.

No.	Symbol	Description
1	DO	The data owner
2	DU	The data user
3	SESP	The searchable encryption service provider
4	MSK	System master key
5	PK	System public parameters
6		An asymmetric encryption algorithm like ECC
7		A pair of keys for algorithm
8		A pair of keys for an algorithm like ECDSA
9		All general attribute set
10		The attributes set of a specific DU
11		Access policy
12		The private attribute key of DU whose attributes set is
13	FID	The set of file identities
14	KW	The set of keywords
15	CKW	The set of ciphertext for keywords
16		The set of indices between keywords and data files
17	CI	The set of ciphertext for indices
18	AI	Auxiliary information
19	TOK	Search token
20	COMM	DO’s commitment to his search request