<s>
In	O
cryptography	O
,	O
Russian	B-General_Concept
copulation	I-General_Concept
is	O
a	O
method	O
of	O
rearranging	O
plaintext	O
before	O
encryption	O
so	O
as	O
to	O
conceal	O
stereotyped	O
headers	O
,	O
salutations	O
,	O
introductions	O
,	O
endings	O
,	O
signatures	O
,	O
etc	O
.	O
</s>
<s>
Padding	B-Algorithm
is	O
another	O
technique	O
for	O
obscuring	O
such	O
clues	O
.	O
</s>
<s>
The	O
technique	O
is	O
to	O
break	O
the	O
starting	O
plaintext	O
message	O
into	O
two	O
parts	O
and	O
then	O
to	O
invert	O
the	O
order	O
of	O
the	O
parts	O
(	O
similar	O
to	O
circular	B-Algorithm
shift	I-Algorithm
)	O
.	O
</s>
