Unfortunately, there are many ways to spy on a computer
by tek-ed - 1/15/10 5:14 PM
In Reply to: thank you for your help.... by mra10
Check for physical devices. Is there a key capture device plugged into your computer anywhere? Weird bulge in your Keyboard cable? or a strange USB key that you don't know anything about?
Barring this, check to see if you have a rootkit installed on your computer. Do a google search to find install rootkits. There are several well documented rootkit finders out there you can use.
Other than this, there really is no way to protect your network communications...you can run tools like NetMon or ethereal on any computer connected to the network and sniff all traffic that travels on the network. This means that anything you communicate with over the network that is *NOT* an SSL connection (https://xxx.com) is sent in clear-text. This includes passwords, and anything you send. This is possible even if you are using a WEP wireless connection! All someone needs to do is plug an ethernet cable into the router and all traffic is immediately identifiable to the person running the sniffing tool. And there really is nothing you can do. really....nothing. Well...kinda...you can send all email correspondence encrypted using PGP. This will prevent anyone from snooping on your email, but this means that your recipient will need your public key to read the mail. This can be a pain.
There are only three ways I can think of to make sure that your network traffic is safe:
1) Tunnel all your traffic through a VPN. Unless you have one set up for work or something, this is not very feasible.
2) If you're wireless, check to see if there is an open wireless access point you can connect to.
3) If you have a smartphone, you may be able to tether your computer and use your smartphone as your connection.
Other than this, I know that there is a way to detect if someone is sniffing network traffic by searching for promiscuous NICs...but the method escapes me for now
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