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At $10^6$ keys per second, going through the full $2^{56}$ keys would take $2^{56}/10^{6}$ seconds, or about 2200 years; the average time would be half that (or a bit more than 1000 years). Obviously, this is longer than anyone would be willing to wait. So, why is DES considered brute-forcible? Well, we can throw considerably more resources at the problem ...

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