<s>
The	O
Silent	O
Circle	O
Instant	O
Message	O
Protocol	O
(	O
SCIMP	B-Protocol
)	O
was	O
an	O
encryption	O
scheme	O
that	O
was	O
developed	O
by	O
Vincent	O
Moscaritolo	O
of	O
Silent	O
Circle	O
.	O
</s>
<s>
It	O
enabled	O
private	O
conversation	O
over	O
instant	O
message	O
transports	O
such	O
as	O
XMPP	B-Protocol
(	O
Jabber	B-Protocol
)	O
.	O
</s>
<s>
SCIMP	B-Protocol
provided	O
encryption	O
,	O
perfect	O
forward	O
secrecy	O
and	O
message	O
authentication	O
.	O
</s>
<s>
Silent	O
Circle	O
used	O
SCIMP	B-Protocol
in	O
their	O
encrypted	O
instant	O
messaging	O
application	O
called	O
Silent	O
Text	O
.	O
</s>
<s>
At	O
the	O
same	O
time	O
,	O
Silent	O
Circle	O
transitioned	O
to	O
using	O
a	O
protocol	O
that	O
uses	O
the	O
Double	B-Algorithm
Ratchet	I-Algorithm
Algorithm	I-Algorithm
instead	O
of	O
SCIMP	B-Protocol
.	O
</s>
