<s>
Keysigning	B-General_Concept
is	O
the	O
process	O
of	O
digitally	O
signing	O
someone	O
else	O
's	O
public	B-Application
key	I-Application
using	O
one	O
's	O
own	O
.	O
</s>
<s>
However	O
,	O
in	O
the	O
PGP	B-Application
community	O
it	O
is	O
customary	O
not	O
to	O
distinguish	O
in	O
speaking	O
between	O
someone	O
's	O
key	O
and	O
certificate	O
,	O
and	O
the	O
term	O
keysigning	B-General_Concept
is	O
used	O
.	O
</s>
<s>
(	O
The	O
term	O
PGP	B-Application
refers	O
here	O
to	O
all	O
implementations	O
of	O
the	O
OpenPGP	O
standard	O
,	O
such	O
as	O
GnuPG	B-Application
.	O
)	O
</s>
<s>
Users	O
of	O
PGP	B-Application
sign	O
one	O
another	O
's	O
keys	O
to	O
indicate	O
to	O
any	O
third	O
party	O
that	O
the	O
signer	O
trusts	O
the	O
signee	O
.	O
</s>
<s>
PGP	B-Application
users	O
often	O
organize	O
key	B-General_Concept
signing	I-General_Concept
parties	O
,	O
where	O
many	O
people	O
meet	O
in	O
person	O
to	O
verify	O
each	O
other	O
's	O
identity	O
using	O
some	O
printed	O
certificate	O
of	O
identity	O
and	O
then	O
sign	O
each	O
other	O
's	O
keys	O
.	O
</s>
