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Online casino Random Number Generators (RNG's)

Random Number Generators are used by online casinos to simulate blackjack, slots, poker, etc. RNGs are a set of instructions run on a computer in order to produce a random number.

If online casinos use a fair RNG why won't they release the formula they're using to prove it?

It wouldn't be hard to write a computer program to simulate 1,000,000,000,000 roulette spins at a given casino if you knew their RNG formula and then to analyze the data in seach of such subtle biases. This is one of the reasons online casinos might not want to reveal their RNG formulas.

If an online casino is using a fair RNG why would they need to change the formula?

One possibility relates to the subject of subtle biases. Even though most online casinos will test their RNG functions against a battery of "randomness tests" passing these tests doesn't insure the function is completely without bias. If a year after releasing their software they discover a subtle bias they might have missed before or they notice a player is winning in a way that seems suspicious it might make sense to slightly modify the RNG formula to destroy the biases. Yet another possibility would be that the casino was in a rush to get their software to market. Because of this they settled for a less than perfect RNG function that failed some randomness tests. It was the best they had at the time and now that they've had some more time to develop a superior function they would like to use the new function.

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