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        SSH2 Protocol Features
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    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 supports also 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 using an SSH1 connection, see the SSH web site http://www.ssh.com/products/ssh/ssh1.html. Note that when using an SSH1 connection, multiple terminal windows and the file transfer operations are not available.

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 root 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 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 scp (Secure file copy) and SFTP (Secure File Transfer Protocol) applications on UNIX.

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