Connection / SSH1
/ Advanced
The SSH1/Advanced category of the Session
Options dialog allows you to further configure your SSH1
connection . The SSH1/Advanced
category only appears when you have selected SSH1
as your
Protocol.
Cipher
The encryption algorithm to use for
data privacy . The default cipher is 3DES.
DES, RC4, and Blowfish ciphers are also available for use with the SSH1
protocol. You may also set the cipher to None
, which will
effectively render your connection nonsecure. No encryption will occur
if the cipher is set to None
, and all data will be transmitted
in plain text.
WARNING: Setting cipher
to None
causes the data channel to be left
unencrypted and offers no security.
Cipher Speed Information -- The DES and 3DES ciphers are very CPU intensive (slow). The RC4 and Blowfish ciphers are considerably less CPU intensive (faster).
MAC (Message Authentication Code) (SSH2 Only)
The SSH2 protocol provides increased security over SSH1 by means of a MAC (Message Authentication Codes) which ensures data integrity . Although specifying a MAC is optional, it is highly recommended that a MAC be specified in order to ensure data integrity.
WARNING: Data integrity
cannot be ensured if MAC is set to None
.
SecureCRT will attempt to connect using the first selected MAC in the MAC list and then, if not successful, work down the list trying each selected MAC. To reorder the list, select the MAC that you want to reposition and use the buttons to the right of the list to move the MAC up or down.
Options group
Compression
Enable this option to have SecureCRT use compression when transferring data.
Level
This option controls the level of compression. The compression level ranges from 0 (minimal compression) to 9 (maximum compression). A higher level means better compression but slower performance. The default value is 5.
Enable OpenSSH agent forwarding
Check this option to use the agent to connect to a remote machine through another remote machine (see Using the Agent).
Force session channel to close on disconnect
When this option is checked and a session is disconnected by the user, SecureCRT will force the connection to close immediately without waiting for a response from the remote system.