User Authentication 3

Field Attributes

•Public-Key of Host-Key – The public key for the host.

-RSA (Version 1): The first field indicates the size of the host key (e.g., 1024), the second field is the encoded public exponent (e.g., 65537), and the last string is the encoded modulus.

-DSA (Version 2): The first field indicates that the encryption method used by SSH is based on the Digital Signature Standard (DSS). The last string is the encoded modulus.

•Host-Key Type – The key type used to generate the host key pair (i.e., public and private keys). (Range: RSA (Version 1), DSA (Version 2), Both: Default: Both) The SSH server uses RSA or DSA for key exchange when the client first establishes a connection with the switch, and then negotiates with the client to select either DES (56-bit) or 3DES (168-bit) for data encryption.

•Save Host-Key from Memory to Flash – Saves the host key from RAM (i.e., volatile memory to flash memory). Otherwise, the host key pair is stored to RAM by default. Note that you must select this item prior to generating the host-key pair.

•Generate – This button is used to generate the host key pair. Note that you must first generate the host key pair before you can enable the SSH server on the SSH Server Settings page.

•Clear – This button clears the host key from both volatile memory (RAM) and non-volatile memory (Flash).

Web – Click Security, SSH, Host-Key Settings. Select the host-key type from the drop-down box, select the option to save the host key from memory to flash (if required) prior to generating the key, and then click Generate.

Figure 3-36 SSH Host-Key Settings

3-59