universally unique id library libuuid generates and parses 128-bit universally unique id's (UUID's). See RFC 4122 for more information. This package contains the uuidgen program and the uuidd daemon. The uuidd daemon is used to generate universally unique identifiers (UUIDs), especially time-based UUID’s, in a secure and guaranteed-unique fashion, even in the face of large numbers of threads trying to grab UUID’s running on different CPU’s. It is used by libuuid as well as the uuidgen program.