Ahren Studer Christina Johns Jaanus Kase Kyle O'Meara Lorrie Faith Cranor A Survey to Guide Group Key Protocol Development. 475-484 2008 ACSAC http://dx.doi.org/10.1109/ACSAC.2008.28 conf/acsac/2008 db/conf/acsac/acsac2008.html#StuderJKOC08