Definition SSH uses public-key cryptography to authenticate the remote computer and allow it to authenticate the user, if necessary. The encryption used by SSH is intended to provide confidentiality and integrity of data over an unsecured network, such as the Internet, although files leaked by Edward Snowden indicate that the National Security Agency can sometimes decrypt SSH, allowing them to read the contents of SSH sessions. Those protocols send information, notably passwords, in plaintext, rendering them susceptible to interception and disclosure using packet analysis. SSH was designed as a replacement for Telnet and for unsecured remote shell protocols such as the Berkeley rlogin, rsh, and rexec protocols.
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Windows 10 uses OpenSSH as its default SSH client.
SSH is generally used to access Unix-like operating systems, but it can also be used on Microsoft Windows. The protocol specification distinguishes between two major versions, referred to as SSH-1 and SSH-2. SSH provides a secure channel over an unsecured network in a client–server architecture, connecting an SSH client application with an SSH server. Typical applications include remote command-line, login, and remote command execution, but any network service can be secured with SSH. Secure Shell ( SSH) is a cryptographic network protocol for operating network services securely over an unsecured network.
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