Content deleted Content added
→Alternatives to cookies: restructure by uses, as the listed alternatives are not equivalent and tend to be used for a single purpose (for which they are better suited than the general-purpose cookies) |
|||
Line 363:
Basic [[web browser]] configuration information has long been collected by [[web analytics]] services in an effort to accurately measure real human [[web traffic]] and discount various forms of [[click fraud]]. With the assistance of [[client-side scripting]] languages, collection of much more esoteric parameters is possible.<ref name="7MnkN">{{cite web |url=http://gemal.dk/browserspy/ |title=BrowserSpy |publisher=gemal.dk |access-date=2010-01-28 |archive-url=https://web.archive.org/web/20080926162150/http://gemal.dk/browserspy/ |archive-date=2008-09-26 |url-status=live}}</ref><ref name="H8nQP">{{cite web |url=http://mypage.direct.ca/s/schinke/defaultbehaviors/clientCapsExtra.html |title=IE "default behaviors [sic]" browser information disclosure tests: clientCaps |publisher=Mypage.direct.ca |access-date=2010-01-28 |archive-url=https://web.archive.org/web/20110605104414/http://mypage.direct.ca/s/schinke/defaultbehaviors/clientCapsExtra.html |archive-date=2011-06-05 |url-status=live}}</ref> Assimilation of such information into a single string constitutes a device fingerprint. In 2010, [[Electronic Frontier Foundation|EFF]] measured at least 18.1 bits of [[Entropy (information theory)|entropy]] possible from browser fingerprinting.<ref name="Ar32G">{{cite web|url=https://panopticlick.eff.org/browser-uniqueness.pdf |title=How Unique Is Your Web Browser? |last1=Eckersley |first1=Peter |date=17 May 2010 |website=eff.org |publisher=Electronic Frontier Foundation |access-date=23 July 2014 |url-status=dead |archive-url=https://web.archive.org/web/20141015220910/https://panopticlick.eff.org/browser-uniqueness.pdf |archive-date=15 October 2014}}</ref> [[Canvas fingerprinting]], a more recent technique, claims to add another 5.7 bits.
===
{{Main|Web storage}}
Some web browsers support persistence mechanisms which allow the page to store the information locally for later use.
| |||