How to SSH from Windows PC to Unix / Linux Workstation
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What is ssh?
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Ssh (Secure
Shell) is a program to log into another computer over a network, to execute
commands in a remote machine, and to move files from one machine to another.
It provides strong authentication and secure communications over unsecure
channels. It is intended as a replacement for rlogin, rsh, and rcp, but
also replaces telnet.
Additionally,
ssh provides secure X connections and secure forwarding of arbitrary TCP
connections.
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| Why
should I use it? |
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The traditional
BSD 'r' - commmands (rsh, rlogin, rcp) are vulnerable to different kinds
of attacks. Somebody who has root access to machines on the network, or
physical access to the wire, can gain unauthorized access to systems in
a variety of ways. It is also possible for such a person to log all the
traffic to and from your system, including passwords (which ssh never
sends in clear text).
The X Window
System also has a number of severe vulnerabilities. With ssh, you can
create secure remote X sessions which are transparent to the user. As
a side effect, using remote X clients with ssh is more convenient for
users.
Users can
continue to use old .rhosts and /etc/hosts.equiv files; changing over
to ssh is mostly transparent for them. If a remote site does not support
ssh, a fallback mechanism to rsh is included.
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| What
kinds of attacks does ssh protect against? |
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Ssh protects
against:
- IP spoofing,
where a remote host sends out packets which pretend to come from another,
trusted host. Ssh even protects against a spoofer on the local network,
who can pretend he is your router to the outside.
- IP source
routing, where a host can pretend that an IP packet comes from another,
trusted host.
- DNS spoofing,
where an attacker forges name server records.
- Interception
of cleartext passwords and other data by intermediate hosts.
- Manipulation
of data by people in control of intermediate hosts
- Attacks
based on listening to X authentication data and spoofed connection to
the X11 server.
In other
words, ssh never trusts the net; somebody hostile who has taken over the
network can only force ssh to disconnect, but cannot decrypted or play
back the traffic, or hijack the connection.
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| Where
do I get ssh? |
| This
software is only available for members of ASU. You can download from the
ASU website at http://www.asu.edu/it/security/software/html/ssh/download.htm.
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| What
next? How to install? |
| After
getting the software just click on the SSHWinxxx.exe file as shown below. |
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After accepting
the software agreement you will be asked the directory to where the software
will be installed. For convienence put it in the default directory and
click next.
Once again,
for ASU members ONLY!
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| Select
all the components. It will take only 6.2MB of your hard disk space. After
clicking next it will install into your hard disk. |
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| After
completing the installation click on the SSH folder, you will see the following
window. Now you only have to press enter or go to file and click connect. |
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| Please
enter hostname you want to connect to and your userid for this hostname.
Then it ask for the password. |
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| Now
enter the password. |
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After opening
the SSH Secure File Transfer window you can :-
- Open the
terminal window( SSH Secure Shell), by just clicking (windows, new terminal)
without typing username and password again.
- You can
even open the windows explorer of your hard disk from which you can
even transfer the data into the ssh window similar to ftp. You can do
it by copying and pasting or simply by dragging and dropping.
Please click
here to see some examples pictures which explains everything.
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