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{{Use dmy dates|date=April 2023}}
'''Cross-device tracking''' is technology that enables the tracking of users across multiple devices such as smartphones, television sets, smart TVs, and personal computers.
'''Cross-device tracking''' is technology that enables the tracking of users across multiple devices such as smartphones, television sets, smart TVs, and personal computers.<ref>{{Cite web|title=A Privacy Analysis of Cross-device Tracking |website=Usenix |last1=Jebara|first1=Tony|last2=Bellovin|first2=Steven M.|year=2017|last3=Kim|first3=Hyungtae|last4=Li|first4=Jie S.|last5=Zimmeck|first5=Sebastian|s2cid=23378463 |url=https://www.usenix.org/system/files/conference/usenixsecurity17/sec17-zimmeck.pdf}}</ref><ref>{{Cite journal |last1=Yuan |first1=H. |last2=Maple |first2=C. |last3=Chen |first3=C. |last4=Watson |first4=T. |date=1 July 2018 |title=Cross-device tracking through identification of user typing behaviours |journal=Electronics Letters |language=en |volume=54 |issue=15 |pages=957–959 |doi=10.1049/el.2018.0893 |bibcode=2018ElL....54..957Y |s2cid=55463759 |issn=0013-5194|doi-access=free }}</ref>
 
More specifically, cross-device tracking is a technique in which technology companies and advertisers deploy trackers, often in the form of unique identifiers, cookies, or even ultrasonic signals, to generate a [[profiling (information science)|profile]] of users across multiple devices, not simply one.<ref name=":15">{{Cite book |last=Arp |first=Daniel |title=2017 IEEE European Symposium on Security and Privacy (EuroS&P) |chapter=Privacy Threats through Ultrasonic Side Channels on Mobile Devices |chapter-url=https://ieeexplore.ieee.org/document/7961950 |year=2017 |pages=1–13 |doi=10.1109/EuroSP.2017.33 |isbn=978-1-5090-5762-7 |s2cid=698921 |via=IEEE Xplore}}</ref> For example, one such form of this tracking uses audio beacons, or inaudible sounds, emitted by one device and recognized through the microphone of the other device.<ref name=":15"/>
 
This form of tracking is used primarily by technology companies and advertisers who use this information to piece together a cohesive profile of the user.<ref name=":15"/> These profiles inform and predict the type of [[Advertising|advertisementsadvertiseents]] the user receives.<ref name=":15"/>
 
==Background==
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Another tactic used by Google is called [[Ad-ID|AdID]] and works on smartphones in tandem with cookies on a user's computer to track behavior across devices.<ref name=":23" />
 
Now, cross-device tracking has evolved into a new, radical form of surveillance technology which enables users to be tracked across multiple devices, including [[smartphone]]s, [[Television|TVs]], and personal computers through the use of audio beacons, or inaudible sound, emitted by one device and recognized through the microphone of the other device, usually a smartphone.<ref name=":15">{{Cite book |last=Arp |first=Daniel |title=2017 IEEE European Symposium on Security and Privacy (EuroS&P) |year=2017 |isbn=978-1-5090-5762-7 |pages=1–13 |chapter=Privacy Threats through Ultrasonic Side Channels on Mobile Devices |doi=10.1109/EuroSP.2017.33 |chapter-url=https://ieeexplore.ieee.org/document/7961950 |via=IEEE Xplore |s2cid=698921}}</ref> In addition, cross-device tracking may presage the future of the [[Internet of things]] (IoT), in which all types of devices––such as offices, cars, and homes––are seamlessly interconnected via the internet.<ref name=":23" />
 
=== Ultrasonic tracking ===