4 ms·

UUIDs are (usually) generated in a systematic fashion, so large parts of them are often possible to determine ahead of time.

• gruez 11y ago
  Not in guid v4
  • mikeash 11y ago
    Unfortunately that is not necessarily true, as nothing requires a UUIDv4 generator to use a cryptographically secure source of randomness.
• MichaelGG 11y ago
  What popular implementations in 2015 are using the braindead UUID generation methods?