Multi-threaded OpenSSH

Multi-threaded OpenSSH

Posted Feb 14, 2008 5:43 UTC (Thu) by gdt (subscriber, #6284)
In reply to: Multi-threaded OpenSSH by JoeBuck
Parent article: Multi-threaded OpenSSH

Rsync does have an option to authenticate using challenge-response. This prevents sniffing of the password, but the password is held as plain text on the server and asking users never to use the same password as elsewhere is rarely successful.

Rsyncd with MD5 can be an effective solution to high speed file transfers but performance is not as good as using a web server with MD5 authentication (rsync's use of blocks limits the effectiveness of sendfile() whereas even a bloated webserver can call sendfile() after generating the HTTP header).

Both of these options, as well as the plaintext variant of SSH, are fine if the data is not confidential. This is true of some science data, such as from radio telescope sensors (this is publicly available, nearly random and needs serious supercomputing to make any sense of). The problem this variant of SSH solves is the case when the confidentiality of the data needs to be retained as it crosses the network.

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