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Secret-sharing building blocks based on quantum broadcast communication arestudied. The confidential capacity region of the pure-loss bosonic broadcastchannel is determined, both with and without key assistance, and an achievableregion is established for the lossy bosonic broadcast channel. If the mainreceiver has a transmissivity of \eta<1/2, then confidentiality solely relieson the key-assisted encryption of the one-time pad. We also address conferencekey agreement for the distillation of two keys, a public key and a secret key.A regularized formula is derived for the key-agreement capacity region infinite dimensions. In the bosonic case, the key-agreement region is includedwithin the capacity region of the corresponding broadcast channel withconfidential messages. We then consider a network with layered secrecy, wherethree users with different security ranks communicate over the same broadcastnetwork. We derive an achievable layered-secrecy region for a pure-loss bosonicchannel that is formed by the concatenation of two beam splitters.

Key Assistance, Key Agreement, and Layered Secrecy for Bosonic Broadcast Channels