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Using Keys with SSH
Monday, 11 October 2004, 09:26 GMT

If you've administered any remote Linux machines, then you're probably already familiar with SSH. As you may know, SSH provides secure, encrypted network communication. Utilities like ssh and sftp, which are based on SSH, protect remote login sessions and file transfers, respectively, and have largely subsumed similar but insecure and unencrypted utilities such as ftp, rlogin, rsh, rcp, and telnet.

(In fact, if any of your systems still use telnet, put down this magazine at once, go disable telnet, install and enable SSH, and then continue reading.)

The ssh utility is easy to use, but typing passwords again and again is a hassle, and precludes scripting remote access. This month, let's explore a better way to use SSH, using OpenSSH (http://www.openssh.org) and SSH protocol version 2. (If you're using a different SSH suite or protocol version 1, some of this month's instructions may not apply or may need to be modified to suit your version of the software.)

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