In the simplest manner, both ends of a communication channel use automatically generated public-private key pairs to encrypt a network connection, and then use a password to authenticate the user. SSH may be used in several methodologies. SSH uses public-key cryptography to authenticate the remote computer and allow it to authenticate the user, if necessary. 2 Authentication: OpenSSH key management.Implementations are distributed for all types of operating systems in common use, including embedded systems.
#Ssh shell secure software#
The most commonly implemented software stack is OpenSSH, released in 1999 as open-source software by the OpenBSD developers. The protocol specification distinguishes two major versions, referred to as SSH-1 and SSH-2. Subsequent development of the protocol suite proceeded in several developer groups, producing several variants of implementation. SSH was first designed in 1995 by Finnish computer scientist Tatu Ylönen. SSH was designed on Unix-like operating systems, as a replacement for Telnet and for unsecured remote Unix shell protocols, such as the Berkeley Remote Shell (rsh) and the related rlogin and rexec protocols, which all use insecure, plaintext transmission of authentication tokens.
SSH operates as a layered protocol suite comprising three principal hierarchical components: the transport layer provides server authentication, confidentiality, and integrity the user authentication protocol validates the user to the server and the connection protocol multiplexes the encrypted tunnel into multiple logical communication channels. SSH applications are based on a client–server architecture, connecting an SSH client instance with an SSH server. Its most notable applications are remote login and command-line execution.
The Secure Shell Protocol ( SSH) is a cryptographic network protocol for operating network services securely over an unsecured network.
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