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May 28, 2017 at 0:50 comment added Gilles 'SO- stop being evil' @DarkHeart Accidental: two files just happen to have the same hash, by coincidence. For MD5, the probability is negligible if you have less than about ten quintillion files (birthday problem. Deliberate: someone creates a pair of files, on purpose, that are not identical but have the same hash. This was first done for MD5 with massive calculations in 2004, and nowadays it is known how to do it for instantly MD5 and with massive calculations for SHA-1, but no one has a clue how to do it for SHA-256.
May 28, 2017 at 0:36 comment added user14755 @Gilles - accidental and deliberate? What does this mean?
May 27, 2017 at 23:32 history edited Kusalananda CC BY-SA 3.0
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May 27, 2017 at 23:09 history edited Kusalananda CC BY-SA 3.0
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May 27, 2017 at 23:02 comment added Gilles 'SO- stop being evil' Note that with MD5, there is no risk of accidental collisions, but deliberate collisions are possible. Use SHA-256 instead if deliberate collisions are a concern.
May 27, 2017 at 23:01 comment added Gilles 'SO- stop being evil' There's an existing wheel for the duplicate finding: fdupes. Pity it has a delete option, but no hardlink option.
May 27, 2017 at 20:23 history edited Kusalananda CC BY-SA 3.0
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May 27, 2017 at 20:19 history undeleted Kusalananda
May 27, 2017 at 20:18 history deleted Kusalananda via Vote
May 27, 2017 at 20:17 history answered Kusalananda CC BY-SA 3.0