Remote physical device fingerprinting by exploiting small, microscopic deviations in device hardware: clock skews. Presents research showing accuracy equivalent to DNA matches, even when the target was hundreds of milliseconds away.
You can download it from the following link: https://packetstormsecurity.com/files/download/36816/KohnoBroidoClaffy05-devicefingerprinting.pdf
Source: https://packetstormsecurity.com/files/36816/KohnoBroidoClaffy05-devicefingerprinting.pdf.html