>>887
colinux:/usr/lib# chown root /usr/lib/ssh-keysign
colinux:/usr/lib# chmod 4711 /usr/lib/ssh-keysign
colinux:/usr/lib# strings ssh | grep ssh-keysign
strings: ssh: No such file or directory
colinux:/usr/lib# ls -al /usr/lib/ssh-keysign
-rws--x--x 1 root root 151496 Sep 19 2003 /usr/lib/ssh-keysign

でした