A Secure Storage and Sharing Scheme of Stroke Electronic Medical Records Based on Consortium Blockchain

Table 1

Scheme symbol.

Symbol	Description
	System public parameters
	System master private key
	Public-private key pair of users
	Symmetric key of user
	Searchable encryption public-private key pair
	Patient ID
	Plain text of electronic medical record
	Ciphertext of electronic medical record
	Digital signature of doctor
	Electronic medical record keyword set
	Pseudoidentity
	Electronic medical record security index
	Cloud storage path of ciphered medical records
	Search trapdoor
	Reencryption key
	Reencrypted ciphertext