 A common use of group keys is to allow a group of users to decrypt a broadcast message that is intended for that entire group of users, and no one else.For example, in the Second World War, group keys (known as "iodoforms", a term invented by a classically educated non-chemist, and nothing to do with the chemical of the same name) were sent to groups of agents by the Special Operations Executive.These group keys allowed all the agents in a particular group to receive a single coded message.