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At least to my way of thinking, open source dongle is kind of an oxymoron. Maybe if you explain what you're trying to accomplish we can point you in a better direction.
I agree with Matir, a dongle is the least of your worries. Could you provide a description of how you access the computer and how you think you are being sniffed? One thing to consider is that if they have had root access, they have probably left ways back in that changing root's password won't affect, so you may be looking at reinstalling from clean media.
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