Hi Atry, On Thu, 9 Oct 2008 13:15:23 +0800, "Atry" <pop.atry@gmail.com> said:
Hi Andy, I saw the source code in seed_rng.hpp, I found you use an uninitialized buffer[] if fopen fails. It often rely on the stack contents when previous calling function runs, and that is not always random.
I think UUID does not need to be random, it just need to be uniquely. So the seed should contains process id, time, MAC address and so on.
There are different types of uuids based on different algorithms. In this case uuid_generator is generating a random-based uuids, and so a random number generator is used and needs to be seeded well to produce the best possible random data. Another type of uuid is a time-based uuid, which does incorporate data like the MAC address. I have not implemented this algorithm. Still I could use data such as process id, and MAC address as random data itself, or to seed a random number generator, but I don't know of portable ways to get this data. < snip > Regards, Andy Tompkins