<s>
In	O
some	O
cases	O
ephemeral	B-General_Concept
keys	I-General_Concept
are	O
used	O
more	O
than	O
once	O
,	O
within	O
a	O
single	O
session	O
(	O
e.g.	O
,	O
in	O
broadcast	O
applications	O
)	O
where	O
the	O
sender	O
generates	O
only	O
one	O
ephemeral	B-General_Concept
key	I-General_Concept
pair	O
per	O
message	O
and	O
the	O
private	B-Application
key	I-Application
is	O
combined	O
separately	O
with	O
each	O
recipient	O
's	O
public	B-Application
key	I-Application
.	O
</s>
<s>
public	O
)	O
ephemeral	B-General_Concept
key	I-General_Concept
agreement	O
keys	O
are	O
the	O
private	O
(	O
resp	O
.	O
</s>
<s>
public	O
)	O
keys	O
of	O
asymmetric	B-Application
key	I-Application
pairs	O
that	O
are	O
used	O
a	O
single	O
key	O
establishment	O
transaction	O
to	O
establish	O
one	O
or	O
more	O
keys	O
(	O
e.g.	O
,	O
key	O
wrapping	O
keys	O
,	O
data	O
encryption	O
keys	O
,	O
or	O
MAC	B-Algorithm
keys	O
)	O
and	O
,	O
optionally	O
,	O
other	O
keying	O
material	O
(	O
e.g.	O
,	O
initialization	B-Algorithm
vectors	I-Algorithm
)	O
.	O
</s>
