Felix Ingram wrote:

> Well that's true but 128 bits still gives you 3 x 10^38 possible
> strings, so you could probably give everyone on the planet a key an
> still not have a collision.

 Understatement of the week! The human population is currently about
6.5x10^9. You could give every teaspoon of the earth (right down to the
liquid iron core) a key and still probably not have a collision.

 I think I'm going to rewatch Powers Of Ten: http://www.powersof10.com/
now :)

Barry

[earth mass: 6x10^27 g]


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