On 01/01/2012 01:52 PM, Richard W.M. Jones wrote:
> On Fri, Dec 30, 2011 at 06:06:26PM +0100, Xavier Leroy wrote:
>> Indeed.  The optional "seed" parameter to Hashtbl.create does exactly
>> this in the new implementation of Hashtbl (the one based on Murmur3).
> It may be worth noting that Perl solved this problem (back in 2003) by
> unconditionally using a seed which is a global set to a random number
> during interpreter initialization.  

That's how my initial reimplementation of Hashtbl worked, using the
Random module to produce seeds, but I was told (correctly) that in
security-sensitive applications it's better to leave the generation of
random numbers under control of the programmer.  For some applications
Random.self_init might be good enough and for others stronger
randomness is needed.

Of course, you can trivially emulate Perl's behavior using the new
Hashtbl implementation + the Random module.

- Xavier Leroy

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