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Old 2007-11-24, 10:37   #7
Wacky's Avatar
Jun 2003
The Texas Hill Country

32·112 Posts

Originally Posted by Fusion_power View Post
31 minutes to crack each of the 64 bit codes.
And no I won't post how I came up with 31 tries. But it is really simple.
Actually, in just over 31 minutes, you can get 32 tries.

But I agree with axn1. It isn't that easy.

After the first test reveals 1 bit of information, each of the rest can add only about 2^(-63) additional bits to the information.

Now, if the test were to reveal something about the number of 1's without caring about any of the 0's, that would be a different situation.

However, as the problem is stated, after the first test, I can completely predict the outcome of any other test, if it fails.

Last fiddled with by Wacky on 2007-11-24 at 10:50
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