If I open my Gmail account in office network or chat with someone in Gtalk, since our communications are through a proxy, will anyone be able to see my mails? Even if I log out, will someone be able to snoop my emails?
Gmail uses HTTPS by default.
However, there are still two ways that IT can see you:
- If your PC has a trusted certificate owned by IT, they can setup an SSL proxy which resigns using their certificate and capture all traffic.
- Your PC might have monitoring software
Either method could allow them to see your authentication cookie, which they could use themselves until you log out.
If they have an evil proxy, they could block logout requests to keep you logged in indefinitely and use your authentication cookie until it expires.
If they have a keylogger on your PC (some companies do this), they'll have your password, too.
In theory your IT department could see and log everything - I doubt that they would though as it would be a waste of resources. As long as you aren't breaking any rules then I don't see this as an issue.
In short, if you are that worried about your personal information, don't use your work network. Use a netbook/laptop and a 3G card for personal internet usage.
As long as you use https, all the data is secure from the moment it leaves your computer until it reaches Google's servers (and vice versa).
Gmail forces you to use https to login, but you have to have it enabled if you want it always on. If your not using https (check the address bar on your browser) Google how to enable it - it's straightforward.
Usually IT people can snoop into your PC (using some tracking programs or remote desktop software). If this is the case they have access to everything you do. Furthermore they can even install a key logger and take your password. It really depends on your companies policies.