It could be. The simple approach is generating a key when the server/channel starts and sharing that between clients. Of course there are downsides to this, but

It could be. The simple approach is generating a key when the server/channel starts and sharing that between clients. Of course there are downsides to this, but you can make improvements to this system to get aspects that you want (such as rotating the key when someone leaves and giving all keys to new members).