<s>
The	O
Titan	B-Application
Security	I-Application
Key	I-Application
is	O
a	O
FIDO-compliant	O
security	O
token	O
developed	O
by	O
Google	B-Application
which	O
contains	O
the	O
Titan	B-Application
M	O
cryptoprocessor	O
which	O
is	O
also	O
developed	O
by	O
Google	B-Application
.	I-Application
</s>
<s>
Depending	O
on	O
the	O
features	O
,	O
the	O
key	O
costs	O
$	O
25-	O
$35	O
,	O
but	O
Google	B-Application
has	O
provided	O
them	O
for	O
free	O
to	O
high-risk	O
users	O
.	O
</s>
<s>
It	O
is	O
considered	O
a	O
more	O
secure	O
form	O
of	O
multi-factor	O
authentication	O
to	O
log	O
in	O
to	O
first-party	O
and	O
third-party	O
services	O
and	O
to	O
enroll	O
in	O
Google	B-Application
's	I-Application
advanced	O
protection	O
program	O
.	O
</s>
<s>
In	O
2021	O
,	O
Google	B-Application
removed	O
the	O
Bluetooth	B-Protocol
model	O
due	O
to	O
concerns	O
about	O
its	O
security	O
and	O
reliability	O
.	O
</s>
<s>
The	O
Bluetooth	B-Protocol
"	O
T1	O
"	O
and	O
"	O
T2	O
"	O
models	O
initially	O
had	O
a	O
security	O
bug	O
that	O
allowed	O
anyone	O
within	O
30	O
feet	O
to	O
make	O
a	O
clone	O
of	O
the	O
key	O
.	O
</s>
<s>
In	O
2019	O
,	O
Google	B-Application
has	O
put	O
a	O
bug	O
bounty	O
up	O
to	O
US	O
$1.5	O
million	O
on	O
the	O
Titan	B-Application
chip	O
.	O
</s>
<s>
While	O
none	O
of	O
these	O
included	O
publicly	O
disclosed	O
security	O
vulnerabilities	O
,	O
Google	B-Application
has	O
discontinued	O
selling	O
Bluetooth	B-Protocol
versions	O
of	O
the	O
keys	O
in	O
August	O
2021	O
,	O
although	O
Bluetooth	B-Protocol
keys	O
continue	O
to	O
work	O
with	O
their	O
warranties	O
honored	O
.	O
</s>
