Check-PC V1.0

local pullEvent = os.pullEvent

--Change the 2 to the ID of the PC, that is logging in
local pc = 2

os.pullEvent = os.pullEventRaw

term.clear()
term.setCursorPos(1,1)

--Change back to the side of the modem on the computer
rednet.open("back")

local usernames = {"Peter", "John"}
local passwords = {"1.40205969E14", "1.51645397E14"}

id, user = rednet.receive()
id, pass = rednet.receive()

local num  = ""
local num3 = 0

for char in pass:gmatch(".") do
  num2 = (("0"):rep(3 - #tostring(string.byte(char))) .. string.byte(char))
  num  = num .. num2
  num3 = num3 + num2
end

num = tonumber(num)

num = num + num3 - 12.64392709*num3
num = num*2.78834729/0.97548326

num = tostring(num)

if user == "Terminate" and num == "191792163723692480" then
  rednet.send(pc, "Termination")
  os.pullEvent = pullEvent
  sleep(30)
end

for loop = 1, #usernames do
  if user == usernames[loop] and num == passwords[loop] then
    rednet.send(pc, "ok")
  end
end

rednet.send(pc, "not ok")

os.reboot()