Heimbriech Tablet OS - Encryption Type A

--this cc tweaked program is used to encrypt and decrypt files using a caesars cipher. Arguements Layout: (Key(Used to encrypt and decrypt text)), (text), (TargetFile(set as -1 if you want it to simply return the value))
local tArgs = {...}
local Target = tArgs[3]
local key = tArgs[1]
encrypt(tArgs[2])

function encrypt(data)
i=1
enc = ""
repeat
enc = enc..string.char(data:byte(i)+key)
i = i+1
until data:byte(i) == nil
return enc
end