41st Parameter, a provider of fraud detection technology which was founded in Scottsdale, Arizona, has been acquired by credit reporting agency and credit services provider Experian. Financial terms of the acquisition were not announced. 41st Parameter's technology uses device identification to help detect web fraud. 41st Parameter was venture backed by JAFCO, Kleiner Perkins Caufield and Byers, and Norwest Venture Partners, and had been founded in 2004. The company now has offices in San Jose, California, Scottsdale, the UK, and Tokyo. 41st Parameter was founded by Ori Eisen.