An entry containing the attributes associated with a GDOI KEK
SA, uniquely identified by the Group ID, Group Member (GM)
ID, & SPI value assigned by the GM's registered Key Server to
the KEK. There will be at least one KEK SA entry for each GM
& two KEK SA entries for a given GM only during a KEK rekey
when a new KEK is received & installed. The KEK SPI is
unique for every KEK for a given Group Member.