When the second user receives the briefcase, he cannot access the data yet. The first user places data inside the briefcase, locks it with his own lock, and then ships the data to the second user. To understand SSH encryption for file transfers, imagine two users passing a briefcase (or shell) containing sensitive data across a public space. SSH protects data through the use of encrypted authentication keys. Typically, the insecure network is the Internet at large. The overarching role SSH plays is to create a secure pathway for sharing data across an insecure network. SSH connections are most commonly used for: Similar configuration settings exist in other popular operating systems like Windows.Īfter configuring SSH settings, users interact with a solution that provides SSH client access, set up to encrypt shared data across the SSH server. On a Mac, for example, the user can start an SSH server and enable remote login through the Shared Preferences Panel. Most major operating systems permit SSH functionality by default through simple configuration changes. It was also a significant improvement for file transfers over less secure methods like FTP. SSH quickly replaced the text-based, insecure Telnet protocol as the preferred method for remote access. Ylonen went on to found SSH Communications Security, where he partnered with the Internet Engineering Task Force (IETF) for formal standardization. Tatu Ylonen, a Finnish university student, devised SSH in 1995 in response to a password-sniffing attack on his university's network. The SSH (Secure Shell) protocol allows for secure access between users over an unsecured network through a proprietary encryption protocol.
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