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1. Jeff Ratliff (gomerx)'s status on Tuesday, 29-Sep-2015 10:26:30 EDT Jeff Ratliff

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   • Tristan B. Kildaire
   A piece of data will always give the same hash. Two different pieces of data can have the same hash.
   • Jeff Ratliff (gomerx)'s status on Tuesday, 29-Sep-2015 10:33:49 EDT Jeff Ratliff

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     • Tristan B. Kildaire
     Yes. Two different files might have the same hash. Although it's very very rare to encounter it.
   • Jeff Ratliff (gomerx)'s status on Tuesday, 29-Sep-2015 10:36:24 EDT Jeff Ratliff

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     • Tristan B. Kildaire
     That's part of why a hash can't be reversed. You would get multiple different answers and now know which is "correct".
     Joshua Judson Rosen likes this.
   • Jeff Ratliff (gomerx)'s status on Tuesday, 29-Sep-2015 10:36:46 EDT Jeff Ratliff

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     s/now/not
   • Jeff Ratliff (gomerx)'s status on Tuesday, 29-Sep-2015 10:44:25 EDT Jeff Ratliff

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     • Tristan B. Kildaire
     No, the same data will give the same digest. But 2 differnt messages can give the same digest.
   • Jeff Ratliff (gomerx)'s status on Tuesday, 29-Sep-2015 10:45:31 EDT Jeff Ratliff

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     • Tristan B. Kildaire
     I think of a hash as a shorthand way to refer to a much bigger piece of data. A thumbprint. Unique to that data, but not globally unique.
   • Jeff Ratliff (gomerx)'s status on Tuesday, 29-Sep-2015 10:47:50 EDT Jeff Ratliff

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     • 千鳥かなめ
     Yes.
   • Jeff Ratliff (gomerx)'s status on Tuesday, 29-Sep-2015 10:48:53 EDT Jeff Ratliff

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     • Tristan B. Kildaire
     Here is an article that helped me a lot: https://crackstation.net/hashing-security.htm
   • Jeff Ratliff (gomerx)'s status on Tuesday, 29-Sep-2015 10:56:28 EDT Jeff Ratliff

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     • Tristan B. Kildaire
     You are looking for a cypher, not a hash. With a hash the # of inputs is way bigger than possible outputs. So collision is inevitable.