SSH short for Secure Shell is a network protocol that provides a secure way for two computers to connect remotely. SSH employs encryption to ensure that hackers cannot interpret the traffic between two connected devices.
SSH provides a layer of security for information transfer between machines. Some important use cases for SSH are:. SSH is a client-server based protocol.
This means the protocol allows a device requesting information or services the client to connect to another device the server. When a client connects to a server over SSH, the machine can be controlled like a local computer. The server has a designated TCP port over which it monitors the network, waiting for clients to initialize the connection. Before a client connects and starts issuing SSH commands , it needs to pass the authentication process. Note: Read our guide on how to use SSH to connect to a remote server for a comprehensive list of steps.
Upon receiving a connection request, the server sends the client a set of supported encryption protocols. The server uses the public key as the authentication method.
The client compares the protocols to its own set. If there are matching protocols, the machines agree to use one to establish the connection. If the keys match, the client and the server agree to use symmetric encryption to communicate during the SSH session.
For this purpose, they communicate using an asymmetrically encrypted process that employs the Diffie-Hellman DH key exchange algorithm. The DH algorithm enables machines to work together and securely create a cryptographic key over a public network. To generate a key, the machines perform the following steps:. By performing the steps above, both machines calculate the same value, their secret key. Finally, the server then attempts to authenticate the user who requests access.
Note: Strong user authentication is one measure to apply to secure your SSH server. This page is about the SSH protocol. For using the Linux ssh command, see ssh command usage. The SSH protocol also referred to as Secure Shell is a method for secure remote login from one computer to another.
It provides several alternative options for strong authentication, and it protects the communications security and integrity with strong encryption.
It is a secure alternative to the non-protected login protocols such as telnet , rlogin and insecure file transfer methods such as FTP. The protocol works in the client-server model, which means that the connection is established by the SSH client connecting to the SSH server. The SSH client drives the connection setup process and uses public key cryptography to verify the identity of the SSH server.
After the setup phase the SSH protocol uses strong symmetric encryption and hashing algorithms to ensure the privacy and integrity of the data that is exchanged between the client and server. There are several options that can be used for user authentication. Find out more on how we use cookies. Read Venafi's TLS protect datasheet to learn how to protect yourself against outages.
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