| From: | Marti Raudsepp <marti(at)juffo(dot)org> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Josh Berkus <josh(at)agliodbs(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, David Fetter <david(at)fetter(dot)org>, Hannu Krosing <hannu(at)2ndquadrant(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: UUIDs in core WAS: 9.4 Proposal: Initdb creates a single table |
| Date: | 2014-04-25 00:43:03 |
| Message-ID: | CABRT9RDFWWZ_=9RQXfWWRj01nu38inOvw+m5qt2KCrg7yrme6w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Apr 25, 2014 at 3:36 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Of course, the weak spot in this analysis is the assumption that there
> are actually 122 independent bits in the value. It's not difficult to
> imagine that systems with crummy random() implementations might only have
> something like 32 bits worth of real randomness.
Obviously you can't use random(). That's why I talked about
cryptographic PRNGs, crypto libraries do proper seeding and generate
reliably random numbers all the time.
Regards,
Marti
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