free-will cannot exist without true randomness. If the state of the universe can be known at a certain point in time including all the laws/rules of matter-energy interaction, we can predict the next state and so on and so forth. If this were true, free-will cannot be real. This simply means, that your life is pre-determined, however depressing it may sound!
However, Quantum Mechanics seems to give us hope that free-will might be real. Because it inherently states that the state of the particles cannot really ever be determined, only described as probabilities. They are in the true sense of the word, random! And because we are a complex product of these interactions, we are random too, our actions too can only be described in terms of probabilities!
If God did not play dice with the Universe, would it be a depressingly uninteresting game?! Not really because even a completely deterministic system has too many variables for us to synthesize, so it will always seem random!
Our fate is determined by our responses to random events!
Entropy is the foundation upon which all cryptographic functions operate. Entropy, in cyber security, is a measure of the randomness or diversity of a data-generating function. Data with full entropy is completely random and no meaningful patterns can be found. Low entropy data provides the ability or possibility to predict forthcoming generated values. One measure of the quality of cryptographic functions is to measure the entropy of their output. Highly entropic algorithms are needed for encryption and hash functions.
Thomas W. Edgar, David O. Manz
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Computer Science 101 