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+SSH-KEYSIGN(8)              System Manager's Manual             SSH-KEYSIGN(8)
+
+NAME
+     ssh-keysign M-bM-^@M-^S ssh helper program for host-based authentication
+
+SYNOPSIS
+     ssh-keysign
+
+DESCRIPTION
+     ssh-keysign is used by ssh(1) to access the local host keys and generate
+     the digital signature required during host-based authentication.
+
+     ssh-keysign is disabled by default and can only be enabled in the global
+     client configuration file /etc/ssh/ssh_config by setting EnableSSHKeysign
+     to M-bM-^@M-^\yesM-bM-^@M-^].
+
+     ssh-keysign is not intended to be invoked by the user, but from ssh(1).
+     See ssh(1) and sshd(8) for more information about host-based
+     authentication.
+
+FILES
+     /etc/ssh/ssh_config
+             Controls whether ssh-keysign is enabled.
+
+     /etc/ssh/ssh_host_dsa_key
+     /etc/ssh/ssh_host_ecdsa_key
+     /etc/ssh/ssh_host_ed25519_key
+     /etc/ssh/ssh_host_rsa_key
+             These files contain the private parts of the host keys used to
+             generate the digital signature.  They should be owned by root,
+             readable only by root, and not accessible to others.  Since they
+             are readable only by root, ssh-keysign must be set-uid root if
+             host-based authentication is used.
+
+     /etc/ssh/ssh_host_dsa_key-cert.pub
+     /etc/ssh/ssh_host_ecdsa_key-cert.pub
+     /etc/ssh/ssh_host_ed25519_key-cert.pub
+     /etc/ssh/ssh_host_rsa_key-cert.pub
+             If these files exist they are assumed to contain public
+             certificate information corresponding with the private keys
+             above.
+
+SEE ALSO
+     ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)
+
+HISTORY
+     ssh-keysign first appeared in OpenBSD 3.2.
+
+AUTHORS
+     Markus Friedl <markus@openbsd.org>
+
+OpenBSD 6.2                    February 17, 2016                   OpenBSD 6.2