Is there somewhere where I could find more information on finding out RNG algorithms or reverse-engineering RNG's, once you have some quantity of random numbers generated by some RNG? For example a local bank is giving each customer a list with 600 one-time passwords (6-digit decimal numbers), and I believe they use the account number as (one of the) seeds for the RNG. Is there some program that I could use, together with the numbers and possible seed, to try to break the RNG? Jüri Kaljundi AS Stallion jk@stallion.ee