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SSH provides a secure channel through an insecure network in the client-server architecture, connecting SSH client applications with SSH servers. Common applications include remote-entry commands and remote execution commands, but every network service can be secured with SSH. The protocol specification distinguishes between major versions, referred to as SSH-1 and SSH-2. SSH is designed as a Telnet protocol and without Shell protocols such as Berkeley Rlogin, Rsh, and Rexx protocol. Those protocols send information, especially passwords, in the plaintext, making them vulnerable to interception and complaints using analysis packages. The encryption used by SSH facilitates providing confidentiality and integration of data over insecure networks, such as the Internet, and files leaked by Edward Snowden show that the National Security Agency can sometimes decrypt SSH, which allows them to read SSH session content.