GNUpg

Buscar llave a modificar:

 $ gpg --list-keys liquidat@example.com
   pub   2048R/ABCDEF12 2012-09-10 [expires: 2032-09-10]
   uid                  liquidat <liquidat@example.com>
   sub   2048R/BCDEF123 2012-09-10 [expires: 2032-09-10]]

Editar llave y modificar:

 $ gpg --edit-key ABCDEF12
   gpg (GnuPG) 1.4.12; Copyright (C) 2012 Free Software Foundation, Inc.
   This is free software: you are free to change and redistribute it.
   There is NO WARRANTY, to the extent permitted by law.
 
   Secret key is available.
 
   pub  2048R/ABCDEF12  created: 2012-09-10  expires: 2013-09-10  usage: SC
                        trust: ultimate      validity: ultimate
   sub  2048R/BCDEF123  created: 2012-09-10  expires: 2013-09-10  usage: E
   [ultimate] (1). liquidat <liquidat@example.com>
 
   gpg> expire
   Changing expiration time for the primary key.
   Please specify how long the key should be valid.
            0 = key does not expire
         <n>  = key expires in n days
         <n>w = key expires in n weeks
         <n>m = key expires in n months
         <n>y = key expires in n years
   Key is valid for? (0) 3y
   Key expires at Fri May  6 15:45:42 2016 CEST
   Is this correct? (y/N) y
 
   You need a passphrase to unlock the secret key for
   user: "liquidat <liquidat@example.com>"
   2048-bit RSA key, ID ABCDEF12, created 2012-09-10
 
   gpg> list
   pub  2048R/ABCDEF12  created: 2012-09-10  expires: 2016-09-10  usage: SC
                        trust: ultimate      validity: ultimate
   sub  2048R/BCDEF123  created: 2012-09-10  expires: 2013-09-10  usage: E
   [ultimate] (1). liquidat <liquidat@example.com>
 
   gpg> key 1
   pub  2048R/ABCDEF12  created: 2012-09-10  expires: 2016-09-10  usage: SC
                        trust: ultimate      validity: ultimate
   sub*  2048R/BCDEF123  created: 2012-09-10  expires: 2013-09-10  usage: E
   [ultimate] (1). liquidat <liquidat@example.com>
 
   gpg> expire
 
   Changing expiration time for a subkey.
   Please specify how long the key should be valid.
            0 = key does not expire
         <n>  = key expires in n days
         <n>w = key expires in n weeks
         <n>m = key expires in n months
         <n>y = key expires in n years
   Key is valid for? (0) 3y
   Key expires at Fri May  6 15:45:42 2016 CEST
   Is this correct? (y/N) y
 
   You need a passphrase to unlock the secret key for
   user: "liquidat <liquidat@example.com>"
   2048-bit RSA key, ID BCDEF123, created 2012-09-10
 
   gpg> list
   pub  2048R/ABCDEF12  created: 2012-09-10  expires: 2016-09-10  usage: SC
                        trust: ultimate      validity: ultimate
   sub  2048R/BCDEF123  created: 2012-09-10  expires: 2016-09-10  usage: E
   [ultimate] (1). liquidat <liquidat@example.com>
 
   gpg> save

Subir al keyserver:

 $ gpg --keyserver pgp.mit.edu --send-keys ABCDEF12
 gpg: sending key ABCDEF12 to hkp server pgp.mit.edu

• Ref How changing the expiry date of gpg keys