<s>
Adiantum	B-Algorithm
is	O
a	O
cipher	B-Application
construction	O
for	O
disk	O
encryption	O
,	O
which	O
uses	O
the	O
ChaCha	O
and	O
Advanced	B-Algorithm
Encryption	I-Algorithm
Standard	I-Algorithm
(	O
AES	B-Algorithm
)	O
ciphers	B-Application
,	O
and	O
Poly1305	B-Algorithm
cryptographic	O
message	B-Algorithm
authentication	I-Algorithm
code	I-Algorithm
(	O
MAC	O
)	O
.	O
</s>
<s>
It	O
was	O
designed	O
in	O
2018	O
by	O
Paul	O
Crowley	O
and	O
Eric	O
Biggers	O
at	O
Google	B-Application
specifically	O
for	O
low-powered	O
mobile	O
devices	O
running	O
Android	B-Application
Go	I-Application
.	O
</s>
<s>
It	O
has	O
been	O
included	O
in	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
since	O
version	O
5.0	O
.	O
</s>
<s>
HPolyC	B-Algorithm
is	O
an	O
earlier	O
variant	O
of	O
Adiantum	B-Algorithm
,	O
which	O
uses	O
a	O
different	O
construction	O
for	O
the	O
Poly1305	B-Algorithm
hash	O
function	O
.	O
</s>
<s>
Adiantum	B-Algorithm
is	O
implemented	O
in	O
Android	B-Application
10	I-Application
as	O
an	O
alternative	O
cipher	B-Application
for	O
device	O
encryption	O
,	O
particularly	O
on	O
low-end	O
devices	O
lacking	O
hardware-accelerated	O
support	O
for	O
AES	B-Algorithm
.	O
</s>
<s>
The	O
company	O
stated	O
that	O
Adiantum	B-Algorithm
ran	O
five	O
times	O
faster	O
than	O
AES-256-XTS	O
on	O
ARM	B-Application
Cortex-A7	I-Application
CPUs	O
.	O
</s>
<s>
Google	B-Application
had	O
previously	O
exempted	O
devices	O
from	O
mandatory	O
device	O
encryption	O
if	O
their	O
specifications	O
affected	O
system	O
performance	O
if	O
enabled	O
.	O
</s>
<s>
Due	O
to	O
the	O
introduction	O
of	O
Adiantum	B-Algorithm
,	O
device	O
encryption	O
becomes	O
mandatory	O
on	O
all	O
Android	B-Application
devices	O
beginning	O
on	O
Android	B-Application
10	I-Application
.	O
</s>
