A Fine-Grained Medical Data Sharing Scheme with Ciphertext Reencryption

Table 1

Notations and definitions used in the proposed scheme.

Notation	Definition
	Large prime
	Cyclic group of order
	Generator of
	Integer domain not greater than
	Bilinear map
	Access policy( is a matrix of , is a map)
	Cloud server provider
	Medical data owner
	Medical data user
	Security parameter
	Attribute universe
	Consensus nodes
	Hash function
	Symmetric-key encryption algorithm
	User’s Global Identifier