Users can be authenticated using custom keys. Define the key location on the Custom Keys page of the Settings dialog.
Figure : The Custom Keys page
Custom keys can also be defined for the command-line client with IdentityKeyFile in the ssh2_config configration file, found in the C:\Documents and Settings\All Users\Application Data\SSH directory, and global.dat configuration file, found in the Client installation directory.
The corresponding public key of the SSH Tectia or OpenSSH private key which is specified with the IdentityKeyFile configuration option or command-line option -K is offered to the server before private keys specified in the identification file.