View difference between Paste ID: AfTY8Ewg and Enh44ud3

 local side = 'back' --Define rednet side
 local file = fs.open("/blacklist", "r")
-local IDblack = file.readLine(1)--All blacklisted IDs
+local allBlacklists = textutils.unserialise(file.readAll()) --Un-serialise the contents of the file. Convert text to table basically.
-local black = file.readLine(2) --All blacklisted messages
+local IDblack = allBlacklists.ids --Set IDblack to ids sub-table of allBlacklists
 local black = allBlacklists.msg --Same story
 file.close()
 
 rednet.open(side) --Open rednet
 
 
 
 id, msg = rednet.receive() --Receive the message
 
 
 local detected = false	--Define a new variable called detected
 
 print("ID = " .. id)
 print("msg = " .. msg)
 
 
 for i=1,#IDblack do --Do the following block of code Length of IDblack times. i stores the current run.
 	print("IDBLACK" .. IDblack[i])
 	if id == IDblack[i] then --If the current run found that IDblack contains an ID then do the following block of code
 		for j=1,#black do	--Do the following block of code amount of entries in black times.
 			print("black" .. black[j])
 			if msg == black[j] then --If current run found that black contains the sent message then
 				detected = true --Set detected to true
 				print("Detected")
 				break --And exit the loop
 			end
 		end
 	end
 	if detected == true then
 		break
 	end
 end
 
 if detected == true then --Do the alerting only if detected was set to true.
 print('Blocked ID: '..id..' Detected... Denying Access')
 rednet.send(id, 'You Are Blacklisted!')
 end