I don ' t think it ' s political downvotes just bad attempt didn ' t make me laugh . That ' s my reasons for points on this . <| sep |> His prices were that high during his TOTW . Not gunna happen on a player this high rated . <| sep |> Your solution is relying on the adversary not knowing the equation you use , which is security through obscurity and not very good . For example , if I knew that you were using xyz and that the values for those variables are derived based on the current time , I could simply run the same equation to generate your password . Additionally , xyz is not a oneway function . If I am able to observe one or a handful of the passwords generated by the equation , I can probably derive what the equation is . Once I ' ve done this , it doesn ' t matter if you ' re rotating the password every 30 minutes or every 30 microseconds , because I ' ll be able to calculate the current password . While the specific example isn ' t that secure , the idea is similar to TOTP used in 2 FA . Basically , two parties have a preshared secret and some algorithm to derive the password based on that secret and the current time .