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Use SSH for remote logins, running commands on another machine, and forwarding connections. Use TLS to secure traffic for an application protocol, as it does for HTTP in HTTPS. They both protect network communication, but they serve different roles and are not interchangeable.
SSH vs. TLS at a glance
| Decision | SSH | TLS |
|---|---|---|
| Main role | Remote access and secure network services. | A secure channel between communicating peers for higher-level protocols. |
| Typical use | Open a shell, execute a remote command, or forward a TCP connection. | Protect application traffic, such as HTTP in HTTPS. |
| What it provides | Remote-session and connection functions, including multiplexed channels for login, commands, and forwarding. | Handshake and record protection; the application protocol defines how TLS starts and how certificates are interpreted. |
| Identity checks | Verify the server’s host key, commonly using a known-host record or a trusted CA model. | The TLS server side is authenticated; client authentication is optional in the general TLS model. |
When should you use SSH?
Choose SSH when the task is to access or operate a remote system. The SSH architecture separates transport security, user authentication, and connection functions. Its connection protocol defines interactive login, remote command execution, and forwarded TCP/IP or X11 connections. These logical channels can share one encrypted tunnel. See RFC 4251 and RFC 4254.
- Use it to open a command-line session on a server.
- Use it to run a command remotely.
- Use its forwarding features when you need to carry another connection through the SSH session.
When should you use TLS?
Choose TLS when an application protocol needs a protected communication channel. TLS supplies channel security; the protocol layered on top determines how the connection is initiated and how exchanged certificates are interpreted. HTTPS is a familiar example: HTTP traffic is protected by successfully initiating TLS over TCP with confidentiality and integrity protection. See RFC 8446 for TLS architecture and RFC 9110 for HTTP semantics.
In the general TLS model, the server side is authenticated and client authentication is optional. Whether a specific application requires client certificates depends on that application and its configuration.
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Why SSH and TLS are not substitutes
The distinction is not simply that one encrypts a connection and the other does not. SSH specifies remote-session behavior as well as transport protection: login, remote execution, and forwarding. TLS provides a secure channel for an application to use; it does not itself define a remote shell or those SSH connection functions. A system administrator opening a server shell uses SSH, while a browser protecting an HTTP exchange uses TLS as part of HTTPS.
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Verify SSH host identity
Encryption does not establish that you connected to the intended SSH server unless its host identity is verified. RFC 4251 describes known-host key records and a trusted CA model, and says accepting an unverified host key is not recommended. Check a host-key warning rather than blindly accepting a changed or unknown key.
Follow current TLS guidance for new protocols
For new protocols that use TLS, the IETF’s July 2026 Best Current Practice, RFC 9852, says TLS 1.3 must be required. It permits TLS 1.2 as an additional, non-default option where deployment considerations warrant it. This guidance applies to TLS, not DTLS. RFC 9852 notes that TLS 1.2 can be configured securely, but generally requires more bespoke configuration than TLS 1.3.
SSH negotiates algorithms, and its effective policy depends on the implementation and configuration. There is no single universal SSH algorithm suite implied by choosing the protocol; use the policy appropriate to the SSH implementation you operate.
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