Connection / SSH2 / Advanced

The SSH2/Advanced category of the Session Options dialog allows you to further configure your SSH2
The second version of the SSH protocol which provides a way to encrypt network traffic between a client and a server, with a slightly different set of security features (including SFTP) than the SSH1 protocol provides. connection. The SSH2 category only appears when you have selected `SSH2`, `SFTP
SFTP is an abbreviation for the Secure Shell File Transfer Protocol; a secure version of the FTP protocol which is used to transfer files between computers on a network.` , or SCP as your Protocol.

Cipher

The encryption
The process of converting a data transmission into a secret format that cannot easily be read by unauthorized individuals. See also: decryption. algorithm to use for data privacy . The ciphers provided for use with the SSH2 protocol in SecureFX are AES, Twofish, Blowfish, 3DES, and RC4. You may also set the cipher to `None`, which will effectively render your connection insecure. 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.

SecureFX will attempt to connect using the first selected cipher in the Cipher list and then, if not successful, work down the list trying each selected cipher. To reorder the list, select the cipher that you want to reposition and use the buttons to the right of the list to move the cipher up or down.

Cipher Speed Information -- The 3DES cipher is very CPU intensive (slow). The AES and Twofish ciphers are considerably less CPU intensive (faster) than 3DES.

MAC (Message Authentication Code)

The SSH2 protocol provides increased security over SSH1
The first version of the SSH protocol which provides a way to encrypt network traffic between a client and a server. 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. The MACs provided for use with the SSH2 protocol in SecureCRT are SHA1, SHA2, MD5, and UMAC.

WARNING: Data integrity cannot be ensured if MAC is set to `None`.

SecureFX 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

Select the type of compression that you want for this SSH2 session.

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. This is a tri-state option; If this option is set to the tri-state value (square), the setting from the Global Options/SSH2 category will be used.

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.