On Fri, Mar 4, 2011 at 5:59 PM, Simon Slavin <slav...@bigfraud.org> wrote:
> > On 4 Mar 2011, at 9:55pm, Black, Michael (IS) wrote: > > > SQlite's random() is a pseudo-random (as are most all) so there is no > collision until you get the same value back at which point it just repeats > the whole sequence again. > > Are you sure about that ? It's very difficult to generate sequences which > do that and still look random, and it wouldn't happen by accident. > SQLite use RC4 as its PRNG. While RC4 is frowned up on for encryption these days, it still makes a pretty good PRNG. Unlike LCG and LFSR PRNGs, the output sequence does not loop the first time you get a repeated output value. > > Simon. > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > -- D. Richard Hipp d...@sqlite.org _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
