Date: Wed, 24 Aug 2011 22:29:48 +0200
From: SF <fahl@dcsec.uni-hannover.de>
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Subject: X.509 to SSH key pair
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Is it possible to create a signed ssh key pair (following the 
PROTOCOL.certkeys - 
http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL.certkeys) 
from an existing signed X.509 public-private key pair?

-SF