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--- informatica:linux:claves_gpg [2013/05/24 09:32] – javi
+++ informatica:linux:claves_gpg [2017/02/02 14:31] – [Claves gpg] javi
@@ Line 5: / Line 5: @@
 Para operar con las claves, instalar gunpg:
-  aptitude install gnupg
+  sudo aptitude install gnupg
@@ Line 216: / Line 216: @@
+==== Revocar Clave del Servidor ====
+Si una clave vamos a dejar de usarla, hay que revocarla.
+Para revocarla, tenemos que crear un certificado de revocación y luego subirlo al servidor. Para crear el certificado de revocación, necesitamos la clave privada. Es aconsejable crear siempre el certificado de revocación.
+Vamos a revocar la antigua clave de 1024DSA porque hemos generado una nueva de 4096RSA
+<code>
+# gpg --list-keys
+-----------------------------
+pub   4096R/F4AD9A55 2014-09-15
+uid                  Jose Legido <jose@legido.com>
+sub   4096R/BAB57DE6 2014-09-15
+pub   1024D/5A988F96 2008-03-20
+uid                  Jose Legido <jose@legido.com>
+sub   2048g/9BC56CC9 2008-03-20
+</code>
+<code>
+# gpg --output revoke1024.asc --gen-revoke 5A988F96
+sec  1024D/5A988F96 2008-03-20 Jose Legido <jose@legido.com>
+Create a revocation certificate for this key? (y/N) y
+Please select the reason for the revocation:
+= No reason specified
+= Key has been compromised
+= Key is superseded
+= Key is no longer used
+  Q = Cancel
+(Probably you want to select 1 here)
+Your decision? 3
+Enter an optional description; end it with an empty line:
+> New Key F4AD9A55
+>
+Reason for revocation: Key is no longer used
+New Key F4AD9A55
+Is this okay? (y/N) y
+You need a passphrase to unlock the secret key for
+user: "Jose Legido <jose@legido.com>"
+-bit DSA key, ID 5A988F96, created 2008-03-20
+ASCII armored output forced.
+Revocation certificate created.
+Please move it to a medium which you can hide away; if Mallory gets
+access to this certificate he can use it to make your key unusable.
+It is smart to print this certificate and store it away, just in case
+your media become unreadable.  But have some caution:  The print system of
+your machine might store the data and make it available to others!
+</code>
+Ahora subimos el certificado de revocación para revocar la clave:
+<code>
+# gpg --import revoke1024.asc
+gpg: key 5A988F96: "Jose Legido <jose@legido.com>" revocation certificate imported
+gpg: Total number processed: 1
+gpg:    new key revocations: 1
+gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model
+gpg: depth: 0  valid:   1  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 1u
+</code>
+Al cabo de un rato, la clave aparece como revocada:
+<code>
+# gpg --search-keys jose@legido.com
+gpg: searching for "jose@legido.com" from hkp server keys.gnupg.net
+(1)	Jose Legido <jose@legido.com>
+bit RSA key F4AD9A55, created: 2014-09-15
+(2)	Jose Legido <jose@legido.com>
+bit DSA key 5A988F96, created: 2008-03-20 (revoked)
+</code>
 ==== Descargar claves a servidor de claves ====