> Some UUIDs are cryptographically secure. Not if they are RFC 4122 UUIDs (more accurately, they are insufficiently cryptographically secure): even the random

> Some UUIDs are cryptographically secure. Not if they are RFC 4122 UUIDs (more accurately, they are insufficiently cryptographically secure): even the random ones are only 122 bits, which only provide 61 bits of security. UUIDs are still really, really useful. I don't recommend not using them unless one understands why and when not to.