# pub:u:1024:17:5DE249965B0358A2:1999-03-15:2006-02-04:59:f:
# the 5th field is what you want.
-trusted-key 81C08922808D0FD0 A2D13001D98C0FBA
+trusted-key A2D13001D98C0FBA
+# 45AD1B8A9474319A4F7F649881C08922808D0FD0
# If you do not pass a recipient to gpg, it will ask for one.