OpenSSH
What OpenSSH is
OpenSSH is a free software suite for encrypted remote login and file transfers using SSH. Its tools include ssh, scp, and sftp for remote operations, alongside ssh-keygen, sshd, and ssh-agent for key management and server-side services. It supports SSH 2, SFTP, and SCP, with both SFTP client and server support. Encryption options include AES, ChaCha20, RSA, ECDSA, and Ed25519, and encryption begins before authentication. Users can forward TCP/IP connections over an encrypted channel or encrypt X Window System traffic with X11 forwarding. Authentication methods include public keys and one-time passwords; Kerberos is available in the portable release. Optional compression can improve performance on slow network links. Agent forwarding lets a local authentication agent hold keys, and OpenSSH applies path-based restrictions to key use. The project says the source may be used commercially and has no restrictive license. Supported systems include Linux, macOS, Cygwin on Windows, and other Unix systems. OpenSSH was founded in 1999. The project routinely disables older protocols, ciphers, key types, and other options with known weaknesses, and interoperability is a goal rather than a guarantee.
Who it suits
It suits people who need encrypted SSH remote access or file transfers on Linux, macOS, Cygwin on Windows, or other Unix systems. It also supports network forwarding and key-based authentication workflows.
What it does well
- Includes tools for login, file transfer, and key management
- Supports SSH 2, SFTP, and SCP
- Encryption starts before authentication
- Offers port forwarding and X11 forwarding
- Commercial use is permitted
What to know first
- Interoperability is not guaranteed
- Older protocols and options with known weaknesses are disabled
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| OpenSSH | Free SSH protocol suite · BSD-style license · commercial use permitted | Free |
As openssh.org lists them, read 11 Oct 2026. The maker's own page has the final word.
Getting started
- Visit the OpenSSH website.
- Choose a supported environment: Linux, macOS, Cygwin on Windows or another Unix system.
- Use the suite tools for remote operations, key management, server-side SSH services or file transfer as needed.
Verdict
OpenSSH provides a broad set of tools for encrypted remote access, file transfer, and forwarding. Its compatibility limits reflect the project’s practice of disabling options with known weaknesses.
Questions
How much does OpenSSH cost?
The listed OpenSSH plan is free. Its source is freely available, and commercial use is permitted.
Which platforms does OpenSSH support?
It supports Linux, macOS, Cygwin on Windows and other Unix systems.
Which protocols does it support?
OpenSSH supports SSH 2, SFTP and SCP.
Does OpenSSH include file transfer tools?
Yes. It includes SFTP client and server support, as well as scp.
Is OpenSSH open source?
Yes. The project says its source is freely available under a non-restrictive license and may be used commercially.
Does OpenSSH offer a free trial?
No. The listed free plan is available without a free trial.
Facts from OpenSSH's own pages
- Authentication
- Listed authentication methods include public keys, one-time passwords, and, in the portable release, Kerberos. · openssh.org, 11 Oct 2026
- Compatibility limit
- Interoperability is a goal but not a promise; older protocols, ciphers, key types, and other options with known weaknesses are routinely disabled. · openssh.org, 11 Oct 2026
- Compression
- OpenSSH can optionally compress data before encryption to improve performance on slow network links. · openssh.org, 11 Oct 2026
- Current release
- The project homepage states that OpenSSH 10.6 was released October 6, 2026. · openssh.org, 11 Oct 2026
- Encryption
- It offers cryptography including AES, ChaCha20, RSA, ECDSA, and Ed25519, and starts encryption before authentication. · openssh.org, 11 Oct 2026
- File transfer
- OpenSSH includes SFTP client and server support. · openssh.org, 11 Oct 2026
- Founded
- 1999 · openssh.org, 23 Sept 2026
- Key handling
- Agent forwarding lets a local authentication agent hold keys without storing them on other machines in the network, and OpenSSH adds path-based restrictions on key use. · openssh.org, 11 Oct 2026
- License
- The project says its source is freely available, has no restrictive license, and may be used for commercial purposes. · openssh.org, 11 Oct 2026
- Platforms
- The portable release is designed for Unix systems including Linux and macOS, as well as Cygwin, and says more systems are being added. · openssh.org, 11 Oct 2026
- Purpose
- OpenSSH provides encrypted connectivity for remote login and remote file transfers using the SSH protocol. · openssh.org, 11 Oct 2026
- Security process
- OpenSSH says it is developed using the security process of the OpenBSD group and provides a private developers list for reporting security issues. · openssh.org, 11 Oct 2026
- Suite tools
- The suite includes tools for remote operations, key management, and server-side SSH services, including ssh, scp, sftp, ssh-keygen, sshd, and ssh-agent. · openssh.org, 11 Oct 2026
- Support and bug reports
- Portable OpenSSH bugs can be reported through the project's problem-report channels; issues in vendor-modified copies should generally be reported to the vendor unless reproducible in unmodified OpenSSH. · openssh.org, 11 Oct 2026
- Tunneling
- Port forwarding carries TCP/IP connections over an encrypted channel, and X11 forwarding encrypts X Window System traffic. · openssh.org, 11 Oct 2026
Where OpenSSH stands on Freedom251
- SSH Clients#5 of 33
- SSH Server Software#10 of 34