SSH-KEYSIGN(8)           BSD System Manager's Manual          SSH-KEYSIGN(8)

NAME         top

     ssh-keysign — ssh helper program for host-based authentication

SYNOPSIS         top


DESCRIPTION         top

     ssh-keysign is used by ssh(1) to access the local host keys and gener‐
     ate 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 “yes”.

     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 authenti‐

FILES         top

             Controls whether ssh-keysign is enabled.

             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.

             If these files exist they are assumed to contain public cer‐
             tificate information corresponding with the private keys above.

SEE ALSO         top

     ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)

HISTORY         top

     ssh-keysign first appeared in OpenBSD 3.2.

AUTHORS         top

     Markus Friedl <>

COLOPHON         top

     This page is part of the openssh (Portable OpenSSH) project.  Informa‐
     tion about the project can be found at  If you have a bug report for
     this manual page, see ⟨⟩.  This page
     was obtained from the tarball openssh-8.1p1.tar.gz fetched from
     ⟨⟩ on
     2020-02-08.  If you discover any rendering problems in this HTML ver‐
     sion of the page, or you believe there is a better or more up-to-date
     source for the page, or you have corrections or improvements to the
     information in this COLOPHON (which is not part of the original manual
     page), send a mail to

BSD                           February 17, 2016                          BSD