A Multiuser Ciphertext Search Scheme Based on Blockchain and SGX

Algorithm 1

Privacy protection of data owner A's data.

	Input: Session key ; A's data ; Search P;
	Output: Transaction txdata;
(1)	Encrypted Owner data and ;
(2)	Encrypted k;
(3)	Set and ;
(4)	Set ;
(5)	Set ;
(6)	Send Set to the DS and get addr;
(7)	Generate timestamp ts1;
(8)	Set txdata = {Ekey, H, addr, ts1};
(9)	Return txdata;