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Suppose that you can compute, store, and check for collisions 1500000 instances of SHA-1(x) in one second (this would require lots of resources). How long

Suppose that you can compute, store, and check for collisions 1500000

instances of SHA-1(x) in one second (this would require lots of resources). How

long do you have to run such computations to have a probability at least

1/1000000 of finding a collision?

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