The following links should alleviate some problems. Fyodor's list of exploits, tools, and links. The network authentication protocol. A GPLed implementation of the SSH version 2 protocol.
Snapshots are available here .
They're also available on this mirror site. One-time passwords in everything. Replace your login and FTP daemon with versions that use OTP for user authentication. The new secure authentication standard - the Secure Remote Password protocol. Secure shell provides secure communications over an insecure network.