Hello all

This doubt came up when discussing the IPv6 stack and sockets, when John, 
Sachin and I were talking. 

Is there such a thing as security over multicast?

When reading RFC 7252, it says in section 8.1 Multicast / Messaging layer:

>    At the time of writing, multicast messages can only be carried in UDP
>    not in DTLS.  This means that the security modes defined for CoAP in
>    this document are not applicable to multicast.

Is that still true?

And if that is so, do we have a workaround for it? Or must all OIC discovery 
packets be sent unencrypted?

And if they are sent unencrypted, can we still send them to the CoAP secure 
port (5684), to signify we would like to receive a secure reply on the 
sender's port?

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
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