3Com SuperStack 4 Configuration Manual page 363

Specifying RSA private key file. If you specify RSA authentication for the SSH
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user, you must specify RSA private key file. The RSA key, which includes the
public key and private key, are generated by the client software. The former is
configured in the server (Switch) and the latter is in the client.
The following description takes the PuTTY as an example.
Generating the Key
Start the Puttygen program, choose SSH1(RSA), then click on the Generate button
and follow the instructions
Figure 98 PuTTy key generator
When the generation process has finished, save the generated public and private
keys to files using the Save buttons.
Run the sshkey program. This converts SSH public key to the format required by
the switch.
Open the public key file generated by puttygen, then click the Convert button
SSH Terminal Services 375