[Bug 236010] rand(3) values strongly correlate with time while this doesn't have to be the case

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Mon Feb 25 03:43:53 UTC 2019


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236010

Kubilay Kocak <koobs at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |maintainer-feedback?(sectea
                   |                            |m at FreeBSD.org)
           Assignee|bugs at FreeBSD.org            |secteam at FreeBSD.org
                 CC|                            |secteam at FreeBSD.org,
                   |                            |security at FreeBSD.org
             Status|New                         |Open
           Keywords|                            |needs-qa
           Severity|Affects Only Me             |Affects Some People

--- Comment #1 from Kubilay Kocak <koobs at FreeBSD.org> ---
This sounds like a request to improve the algorithm, not necessarily achieving
'cryptographically secure', given these details from man rand(3):

     rand, srand, sranddev, rand_r – bad random number generator

     <snip>

     The functions described in this manual page are not cryptographically
     secure.  Cryptographic applications should use arc4random(3) instead.

     These interfaces are obsoleted by random(3).

     <snip>

     For better generator quality, use random(3) or lrand48(3).

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