Computercraft Virtual Currency

AssossaGPB, on 05 July 2014 - 05:45 PM said:

PS: I don't recommend using disks for credit cards as they can easily be cloned.

pauliuskas05, on 05 July 2014 - 05:59 PM said:

AssossaGPB, on 05 July 2014 - 05:45 PM said:

PS: I don't recommend using disks for credit cards as they can easily be cloned.

Why not ? On them there is going to be only account name that can only be accessed with password.

AssossaGPB, on 06 July 2014 - 01:16 AM said:

pauliuskas05, on 05 July 2014 - 05:59 PM said:

AssossaGPB, on 05 July 2014 - 05:45 PM said:

PS: I don't recommend using disks for credit cards as they can easily be cloned.

Why not ? On them there is going to be only account name that can only be accessed with password.

Oh, ok. I thought you were gonna store the password on the card as well.

TheOddByte, on 06 July 2014 - 01:18 AM said:

AssossaGPB, on 06 July 2014 - 01:16 AM said:

pauliuskas05, on 05 July 2014 - 05:59 PM said:

AssossaGPB, on 05 July 2014 - 05:45 PM said:

PS: I don't recommend using disks for credit cards as they can easily be cloned.

Why not ? On them there is going to be only account name that can only be accessed with password.

Oh, ok. I thought you were gonna store the password on the card as well.

Well if he was going to then he could hash them :P/>

Bomb Bloke, on 06 July 2014 - 02:19 AM said:

It's easy enough to copy a disk's contents. It's nearly impossible to clone a disk's ID number. There doesn't need to be anything on a disk at all if you purely want to use it for identification - in fact, done properly, use of disks would also negate any need to even ask for a password… So long as the disks themselves aren't stealable…

pauliuskas05, on 07 July 2014 - 09:50 PM said:

I writed some code, but it doesn't seems to work. When I will get home i will post it…

local modem_side = "back"
local server = 6
local d_side = "bottom"
local pin_check = nil
local exists = nil
function cls()
term.clear()
term.setCursorPos(1,1)
print("BANK")
term.setCursorPos(1,2)
end
function dej()
disk.eject(d_side)
end
rednet.open(modem_side)
cls()
print("		 Please insert your Credit Card")
local event, isDisk = os.pullEvent("disk")
if fs.exists("disk/bank") then
local ccid = disk.getID(d_side)
rednet.send(server, ccid)
senderId, exists, distance= rednet.receive()
if exists == "yes" then
  cls()
  write("		   PIN: ")
  local pin = read("*")
  rednet.send(server, pin)
  senderId, pin_check, distance = rednet.receive()
   if pin_check == "good" then
    pin = nil
    pin_check = nil
    senderId, money, distance = rednet.receive()
    print("You have: "..money)
   elseif pin_check == "bad" then
    cls()
    print("Wrong PIN !")
   end
elseif exists == "no" then
  cls()
  print("	  Account doesn't exists")
end
else
cls()
print("		 This is not a credit card")
dej()
sleep(1.5)
os.shutdown()
end

term.clear()
term.setCursorPos(1,1)
local modem_side = "top"
local srv_id = os.getComputerID()
print("Running BANK server on "..srv_id)
rednet.open(modem_side)
while true do
senderId, id, distance = rednet.receive()
if fs.exists("acc/"..id) then
rednet.send(senderId, "yes")
config.load("acc",id)
local real_pass = config.readVal("pass")
senderId, pass, distance = rednet.receive()
  if pass == real_pass then
   rednet.send(senderId, "good")
   local money = config.readVal("money")
   rednet.send(senderId, money)
   break
  elseif pass ~= real_pass then
   rednet.send(senderId, "bad")
   break
  end
else
  rednet.send(senderId, "no")
  break
end
end

startup:23: attempt to call nil

pauliuskas05, on 09 July 2014 - 10:55 AM said:

ATM Code:

local modem_side = "back"
local server = 6
local d_side = "bottom"
local pin_check = nil
local exists = nil
function cls()
term.clear()
term.setCursorPos(1,1)
print("BANK")
term.setCursorPos(1,2)
end
function dej()
disk.eject(d_side)
end
rednet.open(modem_side)
cls()
print("		 Please insert your Credit Card")
local event, isDisk = os.pullEvent("disk")
if fs.exists("disk/bank") then
local ccid = disk.getID(d_side)
rednet.send(server, ccid)
senderId, exists, distance= rednet.receive()
if exists == "yes" then
  cls()
  write("		   PIN: ")
  local pin = read("*")
  rednet.send(server, pin)
  senderId, pin_check, distance = rednet.receive()
   if pin_check == "good" then
	pin = nil
	pin_check = nil
	senderId, money, distance = rednet.receive()
	print("You have: "..money)
   elseif pin_check == "bad" then
	cls()
	print("Wrong PIN !")
   end
elseif exists == "no" then
  cls()
  print("	  Account doesn't exists")
end
else
cls()
print("		 This is not a credit card")
dej()
sleep(1.5)
os.shutdown()
end

Server Code:

term.clear()
term.setCursorPos(1,1)
local modem_side = "top"
local srv_id = os.getComputerID()
print("Running BANK server on "..srv_id)
rednet.open(modem_side)
while true do
senderId, id, distance = rednet.receive()
if fs.exists("acc/"..id) then
rednet.send(senderId, "yes")
config.load("acc",id)
local real_pass = config.readVal("pass")
senderId, pass, distance = rednet.receive()
  if pass == real_pass then
   rednet.send(senderId, "good")
   local money = config.readVal("money")
   rednet.send(senderId, money)
   break
  elseif pass ~= real_pass then
   rednet.send(senderId, "bad")
   break
  end
else
  rednet.send(senderId, "no")
  break
end
end

On ATM I get Error

startup:23: attempt to call nil

Help me !

rednet.open("right")
cards = {{1, 1000}, {2, 550}}
while true do
senderId, ID = rednet.receive("id")
for i = 1, #cards do
    if cards[i][1] == ID then
	    rednet.send(22, "yes", "answer")
	    senderId, amount = rednet.receive("pay")
	    if cards[i][2] >= amount then
		    rednet.send(22, "done", "transaction")
		    cards[i][2] = cards[i][2] - amount
	    else
		    rednet.send(22, "nope", "transaction")
	    end
    else
	    rednet.send(22, "noCustomer", "transaction")
    end
end
end  

diskID = disk.getID("bottom")
amount = 100
rednet.open("right")
rednet.send(23, diskID, "id")
repeat
    senderId, message = rednet.receive("answer")
until senderId == 23
if message == "yes" then
    rednet.send(23, amount, "pay")
    senderId, message = rednet.receive("transaction")
    if senderId == 23 and message == "done" then
	    print("Transaction Complete!")
    elseif senderId == 23 and message == "nope" then
	    print("Transaction Failed: Not enough money")
    else
	    print("No such customer")
    end
end

AlkamlBan, on 11 July 2014 - 10:55 PM said:

I will do ATMs tommorow (its already 1am :D/> ) and post the code

AlkamlBan, on 11 July 2014 - 11:03 PM said:

AlkamlBan, on 11 July 2014 - 10:55 PM said:

I will do ATMs tommorow (its already 1am :D/>/>/> ) and post the code

Actually I won't because ATMs dispence virtual currency as real-life money. I don't see the point in making such a thing (I mean its more about redstone thatn computers). Plus why use solid money when you can access your bank account from anywhere? Not that a hacker can't steal your money this way but if you carry real money the thief that will kill you can steal it and you can't retreave it but with this you can go to the bank and report you stolen card and they will stop all transactions happening using that specific card. Plus while an ATM dispences money a guy sitting close can easily pick up some. Both ways have an enemy. So its your call which you will use. If you want I will make an ATM just ask.

pauliuskas05, on 15 July 2014 - 09:40 AM said:

AlkamlBan, on 11 July 2014 - 11:03 PM said:

AlkamlBan, on 11 July 2014 - 10:55 PM said:

I will do ATMs tommorow (its already 1am :D/>/>/> ) and post the code

Actually I won't because ATMs dispence virtual currency as real-life money. I don't see the point in making such a thing (I mean its more about redstone thatn computers). Plus why use solid money when you can access your bank account from anywhere? Not that a hacker can't steal your money this way but if you carry real money the thief that will kill you can steal it and you can't retreave it but with this you can go to the bank and report you stolen card and they will stop all transactions happening using that specific card. Plus while an ATM dispences money a guy sitting close can easily pick up some. Both ways have an enemy. So its your call which you will use. If you want I will make an ATM just ask.

It's only VIRTAUL, so there is no cash to give out.

EDIT:
BTW I am on vacation. So I won't always be online.

AlkamlBan, on 11 July 2014 - 10:55 PM said:

Bank Server Code:

rednet.open("right")
cards = {{1, 1000}, {2, 550}}
while true do
senderId, ID = rednet.receive("id")
for i = 1, #cards do
    if cards[i][1] == ID then
	    rednet.send(22, "yes", "answer")
	    senderId, amount = rednet.receive("pay")
	    if cards[i][2] >= amount then
		    rednet.send(22, "done", "transaction")
		    cards[i][2] = cards[i][2] - amount
	    else
		    rednet.send(22, "nope", "transaction")
	    end
    else
	    rednet.send(22, "noCustomer", "transaction")
    end
end
end  

Well, this code is very good, but is there a way to load bank accounts from file ?
Because I need a way to edit and create accounts easily. With program or just using edit…

AlkamlBan, on 11 July 2014 - 10:55 PM said:

Bank Server Code:

rednet.open("right")
cards = {{1, 1000}, {2, 550}}
while true do
senderId, ID = rednet.receive("id")
for i = 1, #cards do
    if cards[i][1] == ID then
	    rednet.send(22, "yes", "answer")
	    senderId, amount = rednet.receive("pay")
	    if cards[i][2] >= amount then
		    rednet.send(22, "done", "transaction")
		    cards[i][2] = cards[i][2] - amount
	    else
		    rednet.send(22, "nope", "transaction")
	    end
    else
	    rednet.send(22, "noCustomer", "transaction")
    end
end
end  

And here is the code for the counter of the store:

diskID = disk.getID("bottom")
amount = 100
rednet.open("right")
rednet.send(23, diskID, "id")
repeat
    senderId, message = rednet.receive("answer")
until senderId == 23
if message == "yes" then
    rednet.send(23, amount, "pay")
    senderId, message = rednet.receive("transaction")
    if senderId == 23 and message == "done" then
	    print("Transaction Complete!")
    elseif senderId == 23 and message == "nope" then
	    print("Transaction Failed: Not enough money")
    else
	    print("No such customer")
    end
end

This is how it works:
1)The computer in the store sends a mesage to the bank server containing the cards ID.
2)The server checks in its table to see if the first number of the tables inside the table match the ID
3)If they do the server sends a message to the computer telling it to send it the amount
4)The computer checks the amount and sees if the second number inside the table the ID was found is bigger or equal to the amount
5)If it is it subtracts the amount from the money in the bank and sends a message to the computer saying that the transaction has been completed.

pauliuskas05, on 18 July 2014 - 08:35 AM said:

AlkamlBan, on 11 July 2014 - 10:55 PM said:

Bank Server Code:

rednet.open("right")
cards = {{1, 1000}, {2, 550}}
while true do
senderId, ID = rednet.receive("id")
for i = 1, #cards do
	if cards[i][1] == ID then
		rednet.send(22, "yes", "answer")
		senderId, amount = rednet.receive("pay")
		if cards[i][2] >= amount then
			rednet.send(22, "done", "transaction")
			cards[i][2] = cards[i][2] - amount
		else
			rednet.send(22, "nope", "transaction")
		end
	else
		rednet.send(22, "noCustomer", "transaction")
	end
end
end  

And here is the code for the counter of the store:

diskID = disk.getID("bottom")
amount = 100
rednet.open("right")
rednet.send(23, diskID, "id")
repeat
	senderId, message = rednet.receive("answer")
until senderId == 23
if message == "yes" then
	rednet.send(23, amount, "pay")
	senderId, message = rednet.receive("transaction")
	if senderId == 23 and message == "done" then
		print("Transaction Complete!")
	elseif senderId == 23 and message == "nope" then
		print("Transaction Failed: Not enough money")
	else
		print("No such customer")
	end
end

This is how it works:
1)The computer in the store sends a mesage to the bank server containing the cards ID.
2)The server checks in its table to see if the first number of the tables inside the table match the ID
3)If they do the server sends a message to the computer telling it to send it the amount
4)The computer checks the amount and sees if the second number inside the table the ID was found is bigger or equal to the amount
5)If it is it subtracts the amount from the money in the bank and sends a message to the computer saying that the transaction has been completed.

But this isn't secure. Because there is no PIN, so anyone who has your card can access it. :(/>

AlkamlBan, on 27 July 2014 - 08:09 PM said:

pauliuskas05, on 18 July 2014 - 08:35 AM said:

AlkamlBan, on 11 July 2014 - 10:55 PM said:

Bank Server Code:

rednet.open("right")
cards = {{1, 1000}, {2, 550}}
while true do
senderId, ID = rednet.receive("id")
for i = 1, #cards do
	if cards[i][1] == ID then
		rednet.send(22, "yes", "answer")
		senderId, amount = rednet.receive("pay")
		if cards[i][2] >= amount then
			rednet.send(22, "done", "transaction")
			cards[i][2] = cards[i][2] - amount
		else
			rednet.send(22, "nope", "transaction")
		end
	else
		rednet.send(22, "noCustomer", "transaction")
	end
end
end  

And here is the code for the counter of the store:

diskID = disk.getID("bottom")
amount = 100
rednet.open("right")
rednet.send(23, diskID, "id")
repeat
	senderId, message = rednet.receive("answer")
until senderId == 23
if message == "yes" then
	rednet.send(23, amount, "pay")
	senderId, message = rednet.receive("transaction")
	if senderId == 23 and message == "done" then
		print("Transaction Complete!")
	elseif senderId == 23 and message == "nope" then
		print("Transaction Failed: Not enough money")
	else
		print("No such customer")
	end
end

This is how it works:
1)The computer in the store sends a mesage to the bank server containing the cards ID.
2)The server checks in its table to see if the first number of the tables inside the table match the ID
3)If they do the server sends a message to the computer telling it to send it the amount
4)The computer checks the amount and sees if the second number inside the table the ID was found is bigger or equal to the amount
5)If it is it subtracts the amount from the money in the bank and sends a message to the computer saying that the transaction has been completed.

But this isn't secure. Because there is no PIN, so anyone who has your card can access it. :(/>/>

Yea I know but really I mean why can't we give those hackers something to do?

pauliuskas05, on 28 July 2014 - 08:43 PM said:

AlkamlBan, on 27 July 2014 - 08:09 PM said:

pauliuskas05, on 18 July 2014 - 08:35 AM said:

AlkamlBan, on 11 July 2014 - 10:55 PM said:

Bank Server Code:

rednet.open("right")
cards = {{1, 1000}, {2, 550}}
while true do
senderId, ID = rednet.receive("id")
for i = 1, #cards do
	if cards[i][1] == ID then
		rednet.send(22, "yes", "answer")
		senderId, amount = rednet.receive("pay")
		if cards[i][2] >= amount then
			rednet.send(22, "done", "transaction")
			cards[i][2] = cards[i][2] - amount
		else
			rednet.send(22, "nope", "transaction")
		end
	else
		rednet.send(22, "noCustomer", "transaction")
	end
end
end  

And here is the code for the counter of the store:

diskID = disk.getID("bottom")
amount = 100
rednet.open("right")
rednet.send(23, diskID, "id")
repeat
	senderId, message = rednet.receive("answer")
until senderId == 23
if message == "yes" then
	rednet.send(23, amount, "pay")
	senderId, message = rednet.receive("transaction")
	if senderId == 23 and message == "done" then
		print("Transaction Complete!")
	elseif senderId == 23 and message == "nope" then
		print("Transaction Failed: Not enough money")
	else
		print("No such customer")
	end
end

This is how it works:
1)The computer in the store sends a mesage to the bank server containing the cards ID.
2)The server checks in its table to see if the first number of the tables inside the table match the ID
3)If they do the server sends a message to the computer telling it to send it the amount
4)The computer checks the amount and sees if the second number inside the table the ID was found is bigger or equal to the amount
5)If it is it subtracts the amount from the money in the bank and sends a message to the computer saying that the transaction has been completed.

But this isn't secure. Because there is no PIN, so anyone who has your card can access it. :(/>/>

Yea I know but really I mean why can't we give those hackers something to do?

I could make PINs myself, but I don't know how to use tables and assign them to a Credit Card(ID)…

if cards[i][3] == <variable in which the ping from the counter is> then
   <if cards[i][2] >= amount in here>
else
  rednet.send(id, "nope") <you may need to modify this>
end

AlkamlBan, on 30 July 2014 - 02:33 PM said:

PIN isn't hard to make just go to the server and at the table add for each an extra string (PIN) inside each table (eg {1, 1000, "1234"}). The you need to modify the counter code to take a string and send it along with the rest of thi information to the bank server (make sure the bank server receives it). Finally and an if statement in the bank server before the if cards[2] >= amount etc etc stating the following:

if cards[i][3] == <variable in which the ping from the counter is> then
   <if cards[i][2] >= amount in here>
else
  rednet.send(id, "nope") <you may need to modify this>
end