<s>
The	O
Grid	B-Operating_System
Security	I-Operating_System
Infrastructure	I-Operating_System
(	O
GSI	O
)	O
,	O
formerly	O
called	O
the	O
Globus	B-Operating_System
Security	I-Operating_System
Infrastructure	I-Operating_System
,	O
is	O
a	O
specification	O
for	O
secret	O
,	O
tamper-proof	O
,	O
delegatable	O
communication	O
between	O
software	O
in	O
a	O
grid	B-Architecture
computing	I-Architecture
environment	O
.	O
</s>
<s>
Secure	O
,	O
authenticatable	O
communication	O
is	O
enabled	O
using	O
asymmetric	B-Application
encryption	I-Application
.	O
</s>
<s>
Transport	B-Protocol
Layer	I-Protocol
Security	I-Protocol
(	O
TLS	O
)	O
can	O
be	O
used	O
to	O
protect	O
the	O
communication	O
channel	O
from	O
eavesdropping	O
or	O
man-in-the-middle	O
attacks	O
.	O
</s>
