OpenSSH - A Free SSH Protocol Suite

OpenSSH - A Free SSH Protocol Suite

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, and sophisticated configuration options.

The OpenSSH suite consists of the following tools:
  • Remote operations are done using ssh, scp, and sftp.
  • Key management with ssh-add, ssh-keysign, ssh-keyscan, and ssh-keygen.
  • The service side consists of sshd, sftp-server, and ssh-agent.


  • Completely open source project with free licensing
  • Strong cryptography (AES, ChaCha20, RSA, ECDSA, Ed25519...)
  • X11 forwarding (which also encrypts X Window System traffic)
  • Port forwarding (encrypted channels for legacy protocols)
  • Strong authentication (public keys, one-time passwords)
  • Agent forwarding
  • Interoperability
  • SFTP client and server support in both SSH1 and SSH2 protocols
  • Optional data compression

OpenSSH is incorporated into many commercial products.

The following operating systems and products are known to integrate OpenSSH into the base system (list is in chronological order, with systems that integrated it first listed earlier).
  • OpenBSD
  • FreeBSD
  • NetBSD
  • Computone
  • Stallion
  • Cygwin
  • e-smith server and gateway
  • Mac OS X Version 10.1 and later
  • HP Procurve Switch 4108GL and 2524/2512
  • Sun Solaris 9 and later (named SunSSH)
  • SmoothWall
  • IPCop
  • SGI Irix
  • ThinLinc
  • Nokia IPSO
  • Cisco CSS11500 series content services switches
  • Cisco SN 5400 series storage routers
  • TopLayer IDS balancers
  • NTI SSH Serial Port Switch
  • Bluecoat (formerly Cacheflow) Proxy SG
  • Novell NetWare
  • Digi CM Console Servers
  • Alcatel OmniSwitch
  • Dell PowerConnect L2 and L3 Switches
  • HP-UX (known as HP-UX Secure Shell)
  • Packeteer PacketShaper 6.0 and above.
  • Juniper Networks JUNOS
  • All Linux systems, such as Red Hat.

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