<s>
In	O
cryptography	O
,	O
the	O
common	B-General_Concept
reference	I-General_Concept
string	I-General_Concept
(	O
CRS	O
)	O
model	O
captures	O
the	O
assumption	O
that	O
a	O
trusted	O
setup	O
in	O
which	O
all	O
involved	O
parties	O
get	O
access	O
to	O
the	O
same	O
string	O
crs	O
taken	O
from	O
some	O
distribution	O
D	O
exists	O
.	O
</s>
<s>
The	O
common	B-General_Concept
reference	I-General_Concept
string	I-General_Concept
model	I-General_Concept
is	O
a	O
generalization	O
of	O
the	O
common	O
random	O
string	O
model	O
,	O
in	O
which	O
D	O
is	O
the	O
uniform	O
distribution	O
of	O
bit	O
strings	O
.	O
</s>
