I've been reading up on GUIDs. According to the Wiki:
Cryptanalysis of the WinAPI GUID generator shows that, since the sequence of V4 GUIDs is pseudo-random, given full knowledge of the internal state, it is possible to predict previous and subsequent values.
Now imagining a server (of which we know little about the internal state) that we can query for millions of GUIDs; would it be possible to use the generated GUIDs to guess the relevant parts of the internal state of the machine, and from there predict subsequent GUIDs?
While my quote mentions WinAPI (hence Windows), I am interested in any widely used implementation.