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web hosting web hosting When the user logs in, the ssh program tells the server which key pair it would like to use for authentication. The server checks if this key is permitted, and if so, sends the user (actually the ssh program running on behalf of the user) a challenge, a random number, encrypted by the user's public key. The challenge can only be decrypted The most convenient way to use RSA authentication may be with an authen- tication agent. See ssh-agent(1) for more information. If other authentication methods fail, ssh prompts the user for a pass- word.

web hosting The password is sent to the remote host for checking; however, since all communications are encrypted, the password cannot be seen by someone listening on the network. SSH protocol version 2 When a user connects using protocol version 2 similar authentication methods are available. Using the default values for PreferredAuthentications, the client will try to authenticate first using the hostbased method; if this method fails public key authentication is attempted, and finally if this method fails keyboard-interactive and password authentication are tried. The public key method is similar to RSA authentication described in the previous section and allows the RSA or DSA algorithm to be used: The client uses his private key, $HOME/.ssh/id_dsa or $HOME/.

web hosting ssh/id_rsa, to sign the session identifier and sends the result to the server. The server checks whether the matching public key is listed in $HOME/.ssh/authorized_keys and grants access if both the key is found and the signature is correct. The session identifier is derived from a shared Diffie-Hellman value and is only known to the client and the server. If public key authentication fails or is not available a password can be sent encrypted to the remote host for proving the user's identity.

web hosting Additionally, ssh supports hostbased or challenge response authentica- tion. Protocol 2 provides additional mechanisms for confidentiality (the traf- fic is encrypted using 3DES, Blowfish, CAST128 or Arcfour) and integrity (hmac-md5, hmac-sha1). Note that protocol 1 lacks a strong mechanism for ensuring the integrity of the connection. Login session and remote execution When the user's identity has been accepted by the server, the server either executes the given command, or logs into the machine and gives the user a normal shell on the remote machine. All communication with the remote command or shell will be automatically encrypted.

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