Connection / SSH1
/ Advanced
The SSH1/Advanced category of the Session
Options dialog allows you to further configure your SSH1 The first version of the SSH protocol which provides a way to encrypt network traffic between a client and a server.
connection A data path or circuit between two computers over a phone line, network cable, or other means. . The SSH1
category only appears when you have selected SSH1 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 concept that data should only be viewed or accessed by those with authorization to do so. Data privacy is achieved using a cipher to encrypt data. . 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 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.
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 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 Code. A component of the SSH2 protocol consisting of a hashing algorithm used to ensure data integrity between an SSH2 client and an SSH2 server communicating over a TCP/IP network such as the internet. The MAC ensures data integrity by protecting against message alteration. (Message Authentication Codes) which ensures data integrity The concept that information can be verified as original and unaltered. If data integrity is ensured, information can only be modified by those with proper authorization. See also: MAC. . 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.
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).
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.