<s>
Simple	O
Encrypted	O
Arithmetic	O
Library	O
or	O
SEAL	O
is	O
a	O
free	B-Application
and	O
open-source	B-Application
cross	B-Operating_System
platform	I-Operating_System
software	O
library	O
developed	O
by	O
Microsoft	O
Research	O
that	O
implements	O
various	O
forms	O
of	O
homomorphic	O
encryption	O
.	O
</s>
<s>
It	O
is	O
open-source	B-Application
(	O
under	O
the	B-License
MIT	I-License
License	I-License
)	O
and	O
written	O
in	O
standard	O
C++	B-Language
without	O
external	O
dependencies	O
and	O
so	O
it	O
can	O
be	O
compiled	O
cross	B-Operating_System
platform	I-Operating_System
.	O
</s>
<s>
An	O
official	O
.NET	B-Application
wrapper	O
written	O
in	O
C#	B-Application
is	O
available	O
and	O
makes	O
it	O
easier	O
for	O
.NET	B-Application
applications	O
to	O
interact	O
with	O
SEAL	O
.	O
</s>
<s>
Microsoft	B-Language
SEAL	I-Language
supports	O
both	O
asymmetric	B-Application
and	O
symmetric	B-Algorithm
(	O
added	O
in	O
version	O
3.4	O
)	O
encryption	O
algorithms	O
.	O
</s>
<s>
Microsoft	B-Language
SEAL	I-Language
comes	O
with	O
two	O
different	O
homomorphic	O
encryption	O
schemes	O
with	O
very	O
different	O
properties	O
:	O
</s>
<s>
Data	O
compression	O
can	O
be	O
achieved	O
by	O
building	O
SEAL	O
with	O
Zlib	B-Language
support	O
.	O
</s>
<s>
By	O
default	O
,	O
data	O
is	O
compressed	O
using	O
the	O
DEFLATE	B-Algorithm
algorithm	O
which	O
achieves	O
significant	O
memory	O
footprint	O
savings	O
when	O
serializing	O
objects	O
such	O
as	O
encryption	O
parameters	O
,	O
ciphertexts	O
,	O
plaintexts	O
,	O
and	O
all	O
available	O
keys	O
:	O
Public	O
,	O
Secret	O
,	O
Relin	O
(	O
relinearization	O
)	O
,	O
and	O
Galois	O
.	O
</s>
