Worse, the most common GUID is 128 bits formed from (I think) a MAC address plus a timestamp. They are designed for uniqueness, not non-guessability. On ourdo

Worse, the most common GUID is 128 bits formed from (I think) a MAC address plus a timestamp. They are designed for uniqueness, not non-guessability. On ourdoings.com photos are given unique, random URLs. No nude photos allowed, though.