~/.ssh:  

     OpenSSH   
~/. ssh   known_hosts   (. . 18.2).

 18.2.  
            

authorized keys                 
~                               
(.  " :   
"  ). ,  ,  
      .

config                        
OpenSSH (.  " 
/etc/ssh/sshd_config"  ).   -
 ,   

/etc/ssh/ssh_config.

environment               ,     
     ssh.  -
  ~/ .bashrc    bash.

id dsa,                    DSA-  , 
id~dsa .pub                      ssh-keygen (.  "ssh-keygen"  "-
-                               :    "  -
).      ,
     . 
 id_dsa_key.pub     ,
       ( 644).
   _dsa_key  
    -,   -
 ( 600).

id rsa,                    DSA-  , 
id~rsa. pub                       ssh-keygen (.  "ssh-keygen" 
~                              " :    "
 ).     
,      .
  id_rsa_key. pub   -
   ,       -
 ( 644).    id_rsa_key
      -
,    ( 600).

known hosts                  RSA- ( ) -
~                           ,     .
OpenSSH     
     (. 
"    "   ).
     -
 DSA    
"HostKeyAlgorithms"  " 
-/.ssh/config  /etc/ssh/ssh_config"  .

                          .   -
  environment    
.     , OpenSSH -
 /etc/ssh/sshrc,     ,
OpenSSH  xauth.

 18. OpenSSH:                            585