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USER’S GUIDE

AUTOMATIC TRANSFER SWITCH

121

Encryption

Secure SHell (SSH) and Secure CoPy (SCP)

The Secure SHell (SSH) protocol provides a secure mechanism to access

computer consoles or shells remotely. The protocol authenticates the server

(in this case, the Automatic Transfer Switch) and encrypts all transmissions

between the SSH client and the server.

• SSH is an alternative to Telnet, which does not provide encryption.

• SSH protects the username and password, the credentials for

authentication, from being used by anyone intercepting network traffic.

• To authenticate the SSH server (the Automatic Transfer Switch) to the

SSH client, SSH uses a host key that is unique to the SSH server and

that provides an identification that cannot be falsified. Therefore, an

invalid server on the network cannot obtain a user name and password

from a user by presenting itself as a valid server.

• The Automatic Transfer Switch supports versions 1 and 2 of SSH. The

encryption mechanisms of the versions differ, and each version has

advantages. Version 1 provides faster login to the Automatic Transfer

Switch, and version 2 provides improved protection from attempts to

intercept, forge, or change data that is transmitted.

• When you enable SSH, Telnet is automatically disabled.

• The interface, user accounts, and user access rights are the same

whether you access the control console through SSH or Telnet.

For information on supported SSH client applications, see

Telnet/SSH.

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APC Automatic Disconnect Switch Guía de usuario Pagina 124