Add fingerprints post.

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+Here are some quick reminders on extracting fingerprints from various
+encryption keys.
+
+With [[GNU Privacy Guard|gpg]] ([[OpenPGP|PGP]] keys):
+
+    $ gpg --fingerprint
+    /path/to/pubring.gpg
+    ------------------------------
+    pub   1024D/12345678 2008-08-09 [expires: 2011-08-08]
+          Key fingerprint = 1234 5678 90AB CDEF 1234  5678 90AB CDEF 1234 5678
+    uid                  John Doe <nowhere@invalid.com>
+    
+    ... (other accounts in your keyring) ...
+
+With OpenSSH ([[SSH]] keys):
+
+    $ ssh-keygen -lf some-key.pub
+    2048 12:34:56:78:90:ab:cd:ef:12:34:56:78:90:ab:12:34 some-key.pub (RSA)
+
+With OpenSSL ([[SSL]] keys):
+
+    $ openssl x509 -noout -in cert.pem -fingerprint
+    SHA1 Fingerprint=12:34:56:78:90:AB:CD:EF:12:34:56:78:90:AB:CD:EF:12:34:56:78