Group keying and Colin's note

Colin noted that -- I am loosely paraphrasing -- the key management 
requirements related to one to many (as in very many!) communication are 
different from those of one to one communication and that he does not 
agree with the notion of designing a single protocol handling both use 
cases.  (Is that fairly accurate, Colin?  Please do correct me if my 
recollection of your comment is incorrect).

It is an interesting topic.  If we want to engage in a nuanced debate on 
this, please do let me know, but the simplistic answer is that there are 
surprisingly many similarities in bootstrapping group keying and 
establishing keys for one to one communication.

Scalable rekeying is a requirement specific to group keying and indeed 
that aspect of it is very different.  So, there is no reason to 
summarily rule out considering design of a protocol that serves both use 
cases.   It has been done before [RFC 3830]!

thanks,
Lakshminath