1: Given N nodes in the group $G_{1} \dots G_{N}$ .

2: G₁ ciphers the message m using its private group key, signs it with its private key, and broadcasts it to the network.

3: $G_{1} \Rightarrow P K G_{1} [M + P K G_{1} (m)]$

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

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