[FFmpeg-soc] [soc]: r532 - matroska/matroskaenc.c

Michael Niedermayer michaelni at gmx.at
Sat Jul 28 19:09:44 CEST 2007


On Sat, Jul 28, 2007 at 05:43:03PM +0300, Kostya wrote:
> On Sat, Jul 28, 2007 at 02:16:23PM +0200, Michael Niedermayer wrote:
> > Hi
> [...]
> > 
> > ... as i said getting a good and secure random number is not easy, you 
> > cannot use anything that could be usefull for an expoit or anything that
> > could by used to identify time or place where encoding happened,
> > not the current time, no pointers, ...
> > you are left with the video/audio you are going to encode, and some stuff
> > we cant easily use like the least significant bits of the time of some
> > interrupts
> What about this?
> http://en.wikipedia.org/wiki/UUID

which version of UUIDs?
you have 3 choices
1/2 contains the MAC address (this is the most stupid idea so far not to
    mention the issue of how to find the MAC address in a portable way)
3/5 are just a md5/sha1 of a string AFAIK which was already suggested
4   is just a random number (with which we are back to square 1 just that we
    now can call it UUID)

what about this?


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

While the State exists there can be no freedom; when there is freedom there
will be no State. -- Vladimir Lenin
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