The names of files which contain private keys which your SSH client will "offer" to a SSH server during (attempted) authentication are listed in the configuration file:
     $HOME/.ssh/config
     /etc/ssh/ssh_config
By default these are
    IdentityFile ~/.ssh/identity    # ...SSH 1
    IdentityFile ~/.ssh/id_rsa      # ...SSH 2
    IdentityFile ~/.ssh/id_dsa      # ...SSH 2
Others can be added should you wish to use different keys for different 
servers.
Simply store all required public keys in ~/.ssh/authorized_keys.
Private keys should be store in ~./ssh2 and listed in ~/.ssh2/identification.
Public keys should be stored in ~/.ssh2 and listed in ~/.ssh2/authorization.
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