@nat @xj9 CouchDB uses MD5 only for digests https://github.com/apache/couchdb/issues/1171#issuecomment-405014445
The reason to use a cryptographic hash function like MD5 over a non-cryptographic hash is so that you can write code that ignores the possibility of collisions. Once the cryptographic hash function is broken - as with MD5 and SHA1 - that's no longer true. That broken assumption almost certainly creates bugs, and they're probably security bugs that allow users to at least corrupt your data.
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