What is SSH and SSH client?

Question

An SSH client is a program that allows establishing a secure and authenticated SSH connections to SSH servers. SSH client software is available for major enterprise environment operating systems, such as Unix variations, Microsoft Windows and IBM z/OS.

What is the difference between SSH client and SSH server?

The SSH client always initiates the setup of the secure connection, and the SSH server listens for incoming connection requests (usually on TCP port 22 on the host system) and responds to them. In the connection setup phase, the SSH server authenticates itself to the client by providing its public key.

What is SSH used for?

SSH or Secure Shell is a network communication protocol that enables two computers to communicate (c.f http or hypertext transfer protocol, which is the protocol used to transfer hypertext such as web pages) and share data.

Why do we need SSH client?

SSH provides password or public-key based authentication and encrypts connections between two network endpoints. It is a secure alternative to legacy login protocols (such as telnet, rlogin) and insecure file transfer methods (such as FTP).

What is OpenSSH server and client?

OpenSSH is a connectivity tool for remote login that uses the SSH protocol. It encrypts all traffic between client and server to eliminate eavesdropping, connection hijacking, and other attacks. An OpenSSH-compatible client can be used to connect to Windows Server and Windows client devices.

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