This link is to a PDF breakdown of a recent infosec speech by Filippo Valsorda and his team detailing the findings of their research on deanonymization of Tor hidden services. Their thorough research revealed that analysis of a hidden service user's HSDir data deanonymized that user similar to a malicious exit node. The paper points out the vulnerability in very detailed technical terms that might be considered heavy reading to some. It also points out several defenses to the problem. https://conference.hitb.org/hitbsecconf2015ams/materials/D2T2%20-%20Filippo%20Valsorda%20and%20George%20Tankersly%20-%20Non-Hidden%20Hidden%20Services%20Considered%20Harmful.pdf
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