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    Introduction >>
        Network Security Risks >>
        Different SSH Versions
        SSH2 Protocol Features
        New Features
        System Requirements
        Desktop Icons
        Support
    Configuration >>
    Connecting >>
    Terminal Window >>
    File Transfer >>
    Toolbar Reference >>
    Menu Reference >>
    Advanced Information >>
    Troubleshooting >>
    Appendices >>

Different SSH Versions

Several different Secure Shell client and server versions exist. The different versions use different implementations of the SSH protocol.

SSH Secure Shell for Workstations Windows client uses SSH protocol version 2 (ssh2), but also supports connections to SSH version 1 (ssh1) servers. Note, however, that SSH version 2 (ssh2) is a more advanced protocol than the legacy version ssh1. For more information on the implications of using an ssh1 connection, see the SSH web site http://www.ssh.com/products/ssh/advisories/statement.cfm.

Note: SSH Communications Security has deprecated the ssh1 protocol and does not recommend using it. For more information, see http://www.ssh.com/products/ssh/cert/deprecation.cfm.

The ssh2 protocol provides a set of radical improvements to ssh1. These improvements include:

  • A much better understood and more secure protocol.
  • A new design which requires much less code to be run with administrative privileges.
  • Totally rewritten code that improves security.
  • New routines for cryptography and mathematics, resulting in considerable improvements in speed.
  • Support for multiple public key algorithms, including RSA, DSA and Diffie-Hellman key exchange.
  • Easy to use file transfers using the integrated file transfer agent in SSH Secure Shell for Workstation Windows client, and the scp2 (secure file copy) and sftp2 (secure file transfer protocol) command line applications.

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