- grunk@cvs.openbsd.org 2008/06/11 21:01:35

     [ssh_config.5 key.h readconf.c readconf.h ssh-keygen.1 ssh-keygen.c key.c
      sshconnect.c]
     Introduce SSH Fingerprint ASCII Visualization, a technique inspired by the
     graphical hash visualization schemes known as "random art", and by
     Dan Kaminsky's musings on the subject during a BlackOp talk at the
     23C3 in Berlin.
     Scientific publication (original paper):
     "Hash Visualization: a New Technique to improve Real-World Security",
     Perrig A. and Song D., 1999, International Workshop on Cryptographic
     Techniques and E-Commerce (CrypTEC '99)
     http://sparrow.ece.cmu.edu/~adrian/projects/validation/validation.pdf
     The algorithm used here is a worm crawling over a discrete plane,
     leaving a trace (augmenting the field) everywhere it goes.
     Movement is taken from dgst_raw 2bit-wise.  Bumping into walls
     makes the respective movement vector be ignored for this turn,
     thus switching to the other color of the chessboard.
     Graphs are not unambiguous for now, because circles in graphs can be
     walked in either direction.
     discussions with several people,
     help, corrections and ok markus@ djm@

1 files changed, 6 insertions, 2 deletions

diff --git a/ssh_config.5 b/ssh_config.5
index d6f3fbf80..28ac724c8 100644
--- a/ssh_config.5
+++ b/ssh_config.5
@@ -34,8 +34,8 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $OpenBSD: ssh_config.5,v 1.106 2008/06/10 18:21:24 dtucker Exp $
-.Dd $Mdocdate: June 10 2008 $
+.\" $OpenBSD: ssh_config.5,v 1.107 2008/06/11 21:01:35 grunk Exp $
+.Dd $Mdocdate: June 11 2008 $
 .Dt SSH_CONFIG 5
 .Os
 .Sh NAME
@@ -161,6 +161,10 @@ will additionally check the host IP address in the
 file.
 This allows ssh to detect if a host key changed due to DNS spoofing.
 If the option is set to
+.Dq fingerprint ,
+not only the host IP address will be checked, but also an ASCII art
+representation of the key will be printed.
+If the option is set to
 .Dq no ,
 the check will not be executed.
 The default is