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ItвЂ™s an open-source protocol for Bluetooth-based tracking in which an individual phoneвЂ™s contact logs are only stored locally, so no central authority can know who has been exposed.

DP-3T: This stands for decentralized privacy-preserving proximity tracing.

Later the two companies plan to build this directly into their operating systems.

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It lets iOS and Android phones communicate with each other over Bluetooth, allowing developers to build a contact tracing app that will work for both. Google/Apple: Many apps will rely on the joint API that Apple and Google are developing.It is easier to anonymize and generally considered better for privacy than location tracking. Bluetooth: Some systems use вЂњproximity tracking,вЂќ in which phones swap encrypted tokens with any other nearby phones over Bluetooth.Location: Some apps identify a personвЂ™s contacts by tracking the phoneвЂ™s movements (for instance, using GPS or triangulation from nearby cell towers) and looking for other phones that have spent time in the same location.In addition, we say something about the basic technology underlying the app. ThereвЂ™s also a field for notes that can help put things in context.

If we cannot answer yes-either because the answer is negative or because it is unknown-the rating is left blank.

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Is the effort transparent? Transparency can take the form of clear, publicly available policies and design, an open-source code base, or all of these.ДЇor each question, if we can answer yes, the app gets a star.

Is data collection minimized? Does the app collect only the information it needs to do what it says?.

If it is automatically deleted in a reasonable amount of time (usually a maximum of around 30 days) or the app allows users to manually delete their own data, we award a star.

Will data be destroyed after a period of time? The data the apps collect should not last forever.Are there limitations on how the data gets used? Data may sometimes be used for purposes other than public health, such as law enforcement-and that may last longer than covid-19.

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Is it voluntary? In some cases, apps are opt-in-but in other places many or all citizens are compelled to download and use them.

Is it mandatory? How private is the app? Are citizensвЂ™ rights being safeguarded? How transparent are the makers about their work? To capture this information, guided by principles put forward by the American Civil Liberties Union and others, we asked five questions.

These are apps designed to automatically tell users or public health officials whether somebody has potentially been exposed to covid-19 itвЂ™s what is generally known as вЂњexposure notification.вЂќДЇor each one we find, there are basic questions to answer: Who is producing it? Is it released yet? Where will it be available, and on what platforms? What technologies does it use? And then, over time, we will also understand more about how each of these services works in practice, such as how many people have downloaded it and what level of penetration it has achieved.Д«ut then there are more complicated issues. What the Covid Tracing Tracker containsДЄt the most basic level, we are compiling a list of automated contact tracing apps that are backed by national governments. So here is more information on what weвЂ™re looking at. Information is constantly changing, and will continue to shift as more apps become available, greater scrutiny is applied to these initiatives, tracing efforts spread, and the pandemic continues.

Our tracking effort is a continuous work in progress. (See вЂњHow to submit a changeвЂќ below.)Д«ut first, there are a lot of caveats and details to run through. WeвЂ™re asking for your help to monitor and improve this database so that the development, rollout, and evolution of these services can be tracked over time.

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