f5e7e62f_n_2010_FireTalks___NovaInfosec__Description
[0] Saturday [Name] Nicholas “aricon” Berthaume [Title] Browser Fingerprinting Using a Stopwatch [Description] 
There are number of methods for fingerprinting a user’s browser. Most of the commonly employed methods are poor at best and can be spoofed. I believe that a another approach is needed. Using mod_security and standard deviation to detect rendering engine nuances for accurate browser and patch level detection server-side. When using JavaScript, header analysis and CSS implementations are not enough.
ShmooCon 2010 FireTalks | NovaInfosec
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