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Calculate expected number of repetitions

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Question

Suppose f (x) is a function with n-bit outputs and with inputs much larger than n bits (this implies that collisions must exist). We know that, with a birthday attack, we have probability 1/2 of finding a collision in approximately 2n/2 steps. Suppose we repeat the birthday attack until we find a collision. Calculate the expected number of repetitions.

Reference no: EM133234870

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