1: G₁ ciphers the message m using its private group key and broadcasts it to the network.

2: $G_{1} \Rightarrow P K G_{1} [m]$

3: $G_{2} \dots G_{N}$ receive and decipher the message using their group keys.

4: $G_{2} \dots G_{N} \Rightarrow M = P K G_{i} [m]$