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Wed Nov 20 12:54:08 CET 2013 · https://mail.python.org/pipermail/python-dev/2013-November/130404.html

Am 20.11.2013 12:41, schrieb Victor Stinner:
> 2013/11/20 Victor Stinner <victor.stinner at gmail.com>:
>> It looks like dict, set and frozenset representation (repr(...))
>> now depends on the platform (probably 32 bit vs 64 bit), even if 
>> PYTHONHASHSEED is set. I don't know if it's an issue or not.
> 
> In Python 3.3, repr(set("abcd")) with PYTHONHASHSEED=0 always give 
> "{'a', 'c', 'b', 'd'}" on 32 bit and 64 bit platforms.
> 
> In Python 3.4, repr(set("abcd")) with PYTHONHASHSEED=0 now gives 
> "{'b', 'a', 'c', 'd'}" on 32 bit.and  "{'a', 'b', 'c', 'd'}" on 64 
> bit.

I have fixed the problem in
http://hg.python.org/cpython/rev/961d832d8734 . My attempt to mix the
hash's MSB into LSB for 32 bit builds was the culprit. It should be
secure enough without the op.

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[Python-Dev] Accepting PEP 456 (Secure hash algorithm)