Hi,

There have been lots of discussions about security in/on top of/below 
ZeroMQ lately. I have a question not about encrypting messages but about 
restricting arbitrary people (i.e. sockets) from subscribing to a e.g. 
PUB socket.

Is this possible with ZeroMQ? Is the PUB socket even aware of who is 
subscribing to its messages? Can we make this functionality available on 
an API level?

Because besides encryption, I will also need a way to define which 
people have access to which data. How could one implement such an access 
system with the current ZeroMQ library?

Help is appreciated. Thank you.

Best,

Oliver
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