Data Access Control Based on Blockchain in Medical Cyber Physical Systems

Algorithm 1

The decision algorithm of access task matching.

	Input: access task
	, expected task
	Output: decision permit/reject
(1)	permit null;
(2)	reject null;
(3)	Task ;
(4)	forto Task.length do
(5)	result Decision (Task [i], ); //Permission
(6)	match
(7)	if result is permitted then
(8)	Task.delete (Task [i]);
(9)	permit.add (Task [i].PID);
(10)	end
(11)	else if result is rejected then
(12)	Task.delete (Task [i]);
(13)	reject.add (Task [i].PID);
(14)	end
(15)	end
(16)	return permit, reject;