Digisol DG-GS1550, Management Manual

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Authentication Commands
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4
d) The client uses its private key to decrypt the challenge string, computes the
MD5 checksum, and sends the checksum back to the switch.
e) The switch compares the checksum sent from the client against that
computed for the original string it sent. If the two checksums match, this
means that the client's private key corresponds to an authorized public key,
and the client is authenticated.
Authenticating SSH v2 Clients
a) The client first queries the switch to determine if DSA public key
authentication using a preferred algorithm is acceptable.
b) If the specified algorithm is supported by the switch, it notifies the client to
proceed with the authentication process. Otherwise, it rejects the request.
c) The client sends a signature generated using the private key to the switch.
d) When the server receives this message, it checks whether the supplied key
is acceptable for authentication, and if so, it then checks whether the
signature is correct. If both checks succeed, the client is authenticated.
Note: The SSH server supports up to four client sessions. The maximum number of
client sessions includes both current Telnet sessions and SSH sessions.
ip ssh server
This command enables the Secure Shell (SSH) server on this switch. Use the no
form to disable this service.
Syntax
[ no ] ip ssh server
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
• The SSH server supports up to four client sessions. The maximum number of
client sessions includes both current Telnet sessions and SSH sessions.
• The SSH server uses DSA or RSA 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.
• You must generate the host key before enabling the SSH server.
Example
Console#ip ssh crypto host-key generate dsa
Console#configure
Console(config)#ip ssh server
Console(config)#