"The Internet was originally designed more as a research and
educational resource and the technology that today forms the
backbone of the Internet is largely based on that philosophy.
However as time has gone by, security has become an important issue
on the Internet and this article looks at implementing more secure
versions of common Internet applications."
"The Internet is built with communication in mind. You will
routinely move around the Web from one site to the other or telnet
to another machine to check your mail or to administer that
machine. The trouble with most of these protocols is that they are
not encrypted. Over a telnet connection, your passwords are sent as
plain-text, which can be read by anyone. Using sophisticated
programs called packet sniffers, even a amateur hacker can spy on
your connection and grab your data."
"Secure Shell (SSH) was built to address these faults and
provide a more secure environment to work in. SSH encrypts all your
traffic including your passwords when you connect to another
machine over the net. SSH also replaces telnet, ftp, rsh, rlogin
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