Blockchain-Based Fine-Grained Data Sharing for Multiple Groups in Internet of Things

Table 1

Notation description.

Notations	Descriptions
	Two multiplicative cyclic groups
	Global public key
	Secret attribute key for DU
	Authority public key
	Authority secret key
	Ciphertext component encrypted by symmetric algorithm
	LSSS access policy
	The ciphertext component encrypted with ABE algorithms
	The whole ciphertext