Universal One-way Function
There is an explicit function which has been demonstrated to be one-way if and only if one-way functions exist. Since this function was the first combinatorial complete one-way function to be demonstrated, it is known as the "universal one-way function". The problem of determining the existence of one-way functions is thus reduced to the problem of proving that this specific function is one-way.
Read more about this topic: One-way Function
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