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- Public key authentication allows you to login to a remote host via the SSH protocol without a password and is more secure than password-based authentication. Try creating a passwordless connection from linuxconfig.local to linuxconfig.org using public-key authentication.
- 1. Create key
- Press ENTER at every prompt.
- linuxconfig.local$ ssh-keygen
- Generating public/private rsa key pair.
- Enter file in which to save the key (/home/user/.ssh/id_rsa):
- Enter passphrase (empty for no passphrase):
- Enter same passphrase again:
- Your identification has been saved in /home/user/.ssh/id_rsa.
- Your public key has been saved in /home/user/.ssh/id_rsa.pub.
- The key fingerprint is:
- b2:ad:a0:80:85:ad:6c:16:bd:1c:e7:63:4f:a0:00:15 user@host
- The key's randomart image is:
- +--[ RSA 2048]----+
- | E. |
- | . |
- |. |
- |.o. |
- |.ooo o. S |
- |oo+ * .+ |
- |++ +.+... |
- |o. ...+. |
- | . .. |
- +-----------------+
- linuxconfig.local$
- For added security '''the key itself''' would be protected using a strong ''passphrase''. If a passphrase is used to protect the key, ssh-agent can be used to cache the passphrase.
- 2. Copy key to remote host
- linuxconfig.local$ ssh-copy-id root@linuxconfig.org
- root@linuxconfig.org's password:
- Now try logging into the machine, with "ssh 'root@linuxconfig.org'", and check in:
- .ssh/authorized_keys
- to make sure we haven't added extra keys that you weren't expecting.
- linuxconfig.local$
- 3. Login to remote host
- Note that no password is required.
- linuxconfig.local$ ssh root@linuxconfig.org
- Last login: Tue Apr 3 12:47:53 2007 from 192.168.0.39
- linuxconfig.org#
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