MB-BC: Drug Traceability System Based on Multibranched Blockchain Structure

Table 1

Common notation description.

Notations	Descriptions
	Order of the group
	Generator of the group
, , , ,	Secret value randomly generated by DA
	Plaintext data of drug data or registration information
	Transaction packaged by data
	The private key of the nodes in the blockchain system
	The public key of the nodes in the blockchain system
	Unique ID of the nodes in the blockchain system
	Access policy tree of CP-ABE
	Nodes in the access policy tree
	Attributes of the access policy tree
	The number of child nodes of in the access policy tree
	The threshold value of each node
	The number of nodes in the access policy tree
	Encrypted ciphertext set of CP-ABE
	Decryption key set of CP-ABE