  Conference Key Agreement (CKA) is a cryptographic effort of multiple parties
to establish a shared secret key. In future quantum networks, generating secret
keys in an anonymous way is of tremendous importance for parties that want to
keep their shared key secret and at the same time protect their own identity.
We provide a definition of anonymity for general protocols and present a CKA
protocol that is provably anonymous under realistic adversarial scenarios. We
base our protocol on shared Greenberger-Horne-Zeilinger states, which have been
proposed as more efficient resources for CKA protocols, compared to bipartite
entangled resources. The existence of secure and anonymous protocols based on
multipartite entangled states provides a new insight on their potential as
resources and paves the way for further applications.
