Man page 8 : ssh-keysign

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

is used by ssh(1) to access the local host keys and generate the digital signature required during host-based authentication with SSH protocol version 2.

is disabled by default and can only be enabled in the global client configuration file .Pa /etc/ssh/ssh_config by setting .Cm EnableSSHKeysign to .Dq yes .

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.

-tag -width Ds
Pa /etc/ssh/ssh_config Controls whether is enabled.
Pa /etc/ssh/ssh_host_dsa_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, must be set-uid root if host-based authentication is used.

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

first appeared in .Ox 3.2 .

.An Markus Friedl Aq