Secure Shell

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Secure Shell (or SSH) is a set of standards and an associated network protocol that allows establishing a secure channel between a local and a remote computer. It uses public-key cryptography to authenticate the remote computer and (optionally) to allow the remote computer to authenticate the user.

SSH without passwords

  • Step 1: Generate keys (public and private) and leave passphrase blank if you want password-less logins:
ssh-keygen -t dsa
  • Step 2: Copy public key to remote server (Important: Only the public key!):
scp ~/.ssh/ username@hostname:.ssh/authorized_keys
  • Step 3: Set directory/file permissions (if not already set):
chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys
  • Step 4: Now, SSH into your remote server (password will be required the first time):
ssh username@hostname

That's it! You are now free to log into your remote server without entering a password. This is useful for automating file transfers. However, it must be used with care. If not executed properly, it is a potential security risk.

External links