[Python-Dev] Hash collision security issue (now public)

Guido van Rossum guido at python.org
Sun Jan 1 16:13:11 CET 2012

Different concern. What if someone were to have code implementing an
external, persistent hash table, using Python's hash() function? They might
have a way to rehash everything when a new version of Python comes along,
but they would not be happy if hash() is different in each process. I
somehow vaguely remember possibly having seen such code, or something else
where a bit of random data was needed and hash() was used since it's so
easily available.

--Guido van Rossum (python.org/~guido)
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