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SSH -- Secure Login Connections over the Internet
Tatu Ylönen
SSH Communications Security Ltd., Finland
Abstract
SSH provides secure login,
file transfer, X11, and TCP/IP connections over an untrusted network.
It uses cryptographic authentication, automatic session encryption,
and integrity protection for transferred data. RSA is used for key
exchange and authentication, and symmetric algorithms (e.g., IDEA or
three-key triple-DES) for encrypting transferred data.
SSH is intended as a replacement for the existing rsh,
rlogin, rcp, rdist, and telnet
protocols. SSH is currently (March 1996) being used at thousands of
sites in at least 50 countries. Its users include top universities,
research laboratories, many major corporations, and numerous smaller
companies and individuals.
The SSH protocol can also be used as a generic transport layer
encryption mechanism, providing both host authentication and user
authentication, together with privacy and integrity protection.
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