Yes, you must match your RNG values to an integer multiple of your alphabet size, or there will be bias on modulo. Filter, smear bits, etc. More explanation he

Yes, you must match your RNG values to an integer multiple of your alphabet size, or there will be bias on modulo. Filter, smear bits, etc. More explanation here: https://stackoverflow.com/questions/10984974/why-do-people-say-there-is-modulo-bias-when-using-a-random-number-generator https://stackoverflow.com/questions/10984974/why-do-people-s...