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Five* non-cryptographic hash functions enter. One hash function leaves.
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lca
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lca2016
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Next: 12 Export Control: A primer for open source hackers
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Marks
Author(s):
Adam Harvey
Location
Costa Hall
Date
feb Wed 03
Days Raw Files
Start
15:40
First Raw Start
15:33
Duration
0:45:00
Offset
0:06:31
End
16:25
Last Raw End
16:33
Chapters
00:00
0:03:25
0:13:25
0:23:25
0:33:25
Total cuts_time
37 min.
https://linux.conf.au/schedule/30208/view_talk
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When you say “hash function” in a room full of developers, people tend to think of the classics: MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512, SHA-OHGODPLEASESTOP, and the like — cryptographic hash functions intended for cryptographic uses. There’s another world out there, though: non-cryptographic hashes. Sometimes you just need to figure out if you’ve already seen a string or structure. Sometimes you need a basic checksum. Sometimes you need a hash that’s just fast and can fit into a 32 bit integer. I’ll run through the state of the art in the world of non-cryptographic hashing — what your best options are, how they compare in terms of CPU and memory usage, and how they work. Who takes it? Whose mixing function reigns supreme? Let’s find out. * I’m saying “five”, but realistically I’m going to cover as many modern options as I can fit into the time available. Let’s say “five plus or minus two” in reality.
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