sshfp generates DNS SSHFP records from SSH public keys. sshfp can take public
keys from a knownhosts file or from scanning the host's sshd daemon. The ssh
client can use these SSHFP records if you set "VerifyHostKeyDNS yes" in the file
/etc/ssh/ssh_config.

WWW: http://www.xelerance.com/software/sshfp/