Here is a riddle I made up, no one has ever solved it, but I really don't think it's that hard.

Stronger than iron
Harder than rock
Lighter than feathers
It's used as a lock

Fast as lightning
Though it takes up no space
Many have cracked it
Without striking its face

  • $\begingroup$ Ok, why is this being downvoted? At least have the courtesy to leave a comment $\endgroup$ – Devon M Mar 13 '15 at 19:18
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    $\begingroup$ How is a password stronger than iron, harder than a rock, and fast as lightning? $\endgroup$ – pacoverflow Mar 13 '15 at 19:48
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    $\begingroup$ Not to mention that a password does take up some space. $\endgroup$ – Golden Dragon Mar 13 '15 at 20:49
  • $\begingroup$ @pacoverflow it is not a password, it is a cipher. A strong cipher will take considerably longer/more resources to crack than say, a chest made of iron or rock. As for "fast as lightning" ciphers are typically executed by computers, which run on electricity, which by definition is as fast as lightning $\endgroup$ – Devon M Mar 14 '15 at 5:32
  • $\begingroup$ @GoldenDragon Are you referring to the sub-atomic amount of space data occupies or the non-existent amount of space that an idea takes up? $\endgroup$ – Devon M Mar 14 '15 at 5:34

I'll just throw out a guess of:

They can be hard as dirt, they secure something (lock), it doesn't really take up space, and they've been broken

  • $\begingroup$ That would be correct, I knew this riddle wasn't hard $\endgroup$ – Devon M Mar 13 '15 at 19:05

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