![]() ![]() While you can get it directly from their anonymous FTP site, a mirror site is suggested. Unix variants: OpenSSH can be down-loaded from. The CS department uses OpenSSHserver software. ![]() SSH helps protect against packet spoofing, IP/host spoofing, password sniffing, and eavesdropping. Named for Secure SHell, it encapsulates an entire session from the initial login onward, with encryption methods that are, for all practical purposes, unbreakable. The easiest way to prevent these attacks is to encrypt the packets so they are unintelligible to all but the client and the host, and one way this is done is via ssh. These passwords, along with the user names, are gathered with a program popularly known as a packet-sniffer, and the new information can be used to gain access to our systems, generally resulting in malicious activity (although usually restricted to the user in question). Telnet is particularly bad, most notably for the passwords that are typed as the user initiates the session. Most protocols don't have any encryption, and any packets sent from the client to the host are out there for anyone in-between to intercept and read. Most of these attacks come from people who were able to learn the password of an account of a local user, usually by "sniffing" it right from the network. We as system administration staff here in the CS department of Princeton are having to deal with break-ins, both attempted and successful, and compromised accounts. The need for security, as we hardly need reminding, is ever-increasing. Newer SSH clients (OpenSSH 6.8 or later) will use the SHA256 fingerprint: SHA256:9yBBea9Z0ER6asvvtNf6fRXVra6LOQ3OVZLtYKVpNc8. Some older SSH clients may display the new fingerprint as: xepon-kibyl-bogur-palik-zyvar-lesuc-rikof-zusab-hypib-volyh-muxux. ![]() On February 1, 2016, CS Department login hosts switched to using RSA type SSH host keys.
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