A User-Centered Medical Data Sharing Scheme for Privacy-Preserving Machine Learning

Algorithm 1

Medical data storage.

	Input: Raw Data ; Public Key ; Data Type ; Random Number ; Private Key ;
	Output: Storage Index ; Blockchain Transaction ;
	Stage 1: Upload data to the cloud server:
(1)	Generate symmetric key by
(2)	Encrypted raw data
(3)	Send to the cloud server and get
	Stage 2: Upload to Blockchain
(4)	Generate timestamp
(5)	Generate ciphertext hash
(6)	User Signature
(7)	Call the authorization contract to get
(8)	Generate random number
(9)	Encryption symmetric key :
(10)
(11)	Call the data contract to upload data to the blockchain
(12)	Call the Authorized contract to upload data , and
(13)	return (, );