I'm reading Stephenson's Cryponomicon, and it reawakened my interest in encryption, authentication, et cetera. Combine that with the recent discussion in TWiT about Leo's key. I would like to start using a digital signature on my emails. I understand the underlying concept and principles, I just don't know about how to go about starting. I'm using Thunderbird as my email client. I have the Enigmail extension, but it is not installed. As an additional, slightly off topic question, what do you use for secure IM? Thank you for your time.