<s>
ccrypt	B-General_Concept
is	O
a	O
utility	O
for	O
the	O
secure	O
encryption	O
and	O
decryption	O
of	O
files	B-Operating_System
and	O
streams	B-Architecture
.	O
</s>
<s>
It	O
was	O
designed	O
as	O
a	O
replacement	O
for	O
the	O
standard	O
UNIX	B-Application
crypt	O
utility	O
,	O
which	O
is	O
notorious	O
for	O
using	O
a	O
very	O
weak	O
encryption	O
algorithm	O
.	O
</s>
<s>
ccrypt	B-General_Concept
is	O
based	O
on	O
the	O
Rijndael	B-Algorithm
cypher	B-Application
,	O
the	O
same	O
cipher	B-Application
used	O
in	O
the	O
AES	B-Algorithm
standard	O
.	O
</s>
<s>
However	O
,	O
in	O
the	O
AES	B-Algorithm
standard	O
a	O
128-bit	O
block	O
size	O
is	O
used	O
,	O
whereas	O
ccrypt	B-General_Concept
uses	O
a	O
256-bit	O
block	O
size	O
.	O
</s>
<s>
ccrypt	B-General_Concept
commonly	O
uses	O
the	O
.cpt	B-Application
file	O
extension	O
for	O
encrypted	O
files	B-Operating_System
.	O
</s>
<s>
ccrypt	B-General_Concept
does	O
not	O
provide	O
an	O
authenticated	B-Algorithm
encryption	I-Algorithm
scheme	O
and	O
therefore	O
does	O
not	O
protect	O
the	O
integrity	O
of	O
encrypted	O
data	O
.	O
</s>
