She looks like a teenager who ' s wearing makeup for the first time <| sep |> i blocked that guy because he was so annoying <| sep |> The entire Pacific NW is an echo chamber <| sep |> WarlockYear 2 Trials Jackal HelmetDays of Iron Arms w OrnamentVoidfang VestmentsSpektar Haliaetus LegsExotic FWC BondShader Ascendant PlaneCandlelight or pretty much any shader <| sep |> You need a oneway function , as used in cryptographic tokens . More or less what you ' re looking for is some function that scrambles the input in a way that is not easily reversible and doesn ' t have a clear pattern in the output . I don ' t think this is really possible with basic algebra because you ' re never ' discarding ' part of the number . However if you add the modulus operator %, basically the remainder after division , you can do things like ' nxy % 65535 ' where n is a random largeish constant integer , x is a ' secret ' that represents the password , and y is a chosen integer sequence or random or whatever for the trial that is shared . nxy will generate a very large number , then you take the remainder to arrive at a value from 065534 which looks ' random ' even if you observe a lot of trials , and doesn ' t really tell you anything about x even if you know y . Both sides can run this algorithm and compare their result . This isn ' t cryptographically secure , but it illustrates the idea and a simple approach . You can read more here a real life example , TOTP mentioned above , combines a secret key previously shared by a secure mechanism with the current time , and hashes this in an irreversible manner using SHA 11 by default to generate a onetime password . Since the adversary doesn ' t know the secret key , and the hash algorithm is well designed to be cryptographically secure , it doesn ' t matter how many passwords they observe , they can never go backwards to the secret key and be able to generate an arbitrary password knowing only the time . The general class of what you ' re trying to do is a onetime password , read more about real implementations here timepassword