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OpenSSH is the premier connectivity tool for remote login with the SSH protocol. It encrypts all traffic to eliminate eavesdropping, connection hijacking, and other attacks. In addition, OpenSSH provides a large suite of secure tunneling capabilities, several authentication methods,. This is the start page for the SSH (Secure Shell) protocol, software, and related information. SSH is a software package that enables secure system administration and file transfers over insecure networks. It is used in nearly every data center and in every large enterprise. This page was created by the inventor of SSH, Tatu Ylonen (twitter.
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 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.
Ssh Version 1
The SSH2 protocol provides a set of radical improvements to SSH1. These improvements include:
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- 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) andSFTP
(Secure File Transfer Protocol) applications.