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<title>Exposure Notification</title>

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<h1 id="firstHeading" class="firstHeading mw-first-heading">Exposure Notification</h1>

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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="de" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="de" dir="ltr">Das Exposure Notification Framework (ENF; <a href="Deutsche_Sprache" title="Deutsche Sprache">deutsch</a> „Expositionsbenachrichtigungs-Rahmenwerk“; auch Google/Apple Exposure Notification, GAEN<a href="#cite_note-1">[1]</a>) ist ein von <a href="Apple" title="Apple">Apple</a> und <a href="Google_LLC" title="Google LLC">Google</a> entwickeltes System, dessen Ziel die Reduzierung der Verbreitung von <a href="COVID-19" title="COVID-19">COVID-19</a> durch Contact-Tracing ist.<a href="#cite_note-2">[2]</a><a href="#cite_note-:0-3">[3]</a><a href="#cite_note-4">[4]</a> Es stellt eine <a href="Programmierschnittstelle" title="Programmierschnittstelle">Programmierschnittstelle</a> (API) bereit, über das offizielle Regierungsstellen wie Gesundheitsbehörden beziehungsweise von diesen beauftragte Dritte auf bereitgestellte Funktionen zugreifen können.<a href="#cite_note-:0-3">[3]</a><a href="#cite_note-5">[5]</a> Das ENF ist auf Betriebssystemebene in <a href="IOS_(Betriebssystem)" title="IOS (Betriebssystem)">iOS</a> und die <a href="Google-Play-Dienste" title="Google-Play-Dienste">Google-Play-Dienste</a> eingebunden und ermöglicht den Austausch von Zufallsschlüsseln über <a href="Bluetooth_Low_Energy" title="Bluetooth Low Energy">Bluetooth Low Energy</a> (BLE).<a href="#cite_note-6">[6]</a>

<div class="mw-heading mw-heading2"><h2 id="Funktionsweise">Funktionsweise</h2></div>

Die hier beschriebene Funktionsweise des ENF basiert auf den Spezifikationen zur Kryptografie in der Version 1.2.<a href="#cite_note-:1-7">[7]</a>

Zu Beginn des Key Schedules wird ein Temporary Exposure Key (<math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle tek_{i}}">

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<annotation encoding="application/x-tex">{\displaystyle tek_{i}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/dab771d6bf455c3a82d5b2fde5b0010440f736a9.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:3.934ex; height:2.509ex;" alt="{\displaystyle tek_{i}}" loading="lazy">) – ein 16-Byte-Schlüssel – mit einem Cryptographic Random Number Generator (CRNG) generiert. Generierte <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle tek_{i}}">

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<annotation encoding="application/x-tex">{\displaystyle tek_{i}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/dab771d6bf455c3a82d5b2fde5b0010440f736a9.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:3.934ex; height:2.509ex;" alt="{\displaystyle tek_{i}}" loading="lazy"> wechseln täglich und umfassen jeweils <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle TEKRollingPeriod:=144}">

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<annotation encoding="application/x-tex">{\displaystyle TEKRollingPeriod:=144}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/800ebb06f3bf5705f14947672ed48e9530af2d98.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:27.325ex; height:2.509ex;" alt="{\displaystyle TEKRollingPeriod:=144}" loading="lazy"> ca. zehn-minütige Zeitintervalle der Form <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle ENIntervalNumber(z)={\frac {Zeitstempel}{60\times 10}}}">

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<annotation encoding="application/x-tex">{\displaystyle ENIntervalNumber(z)={\frac {Zeitstempel}{60\times 10}}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/4ca7b852d6fa400d0f2a529fdc1832e18a9e4e08.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:40.23ex; height:5.343ex;" alt="{\displaystyle ENIntervalNumber(z)={\frac {Zeitstempel}{60\times 10}}}" loading="lazy"> mit Zeitangabe in <a href="Unixzeit" title="Unixzeit">Unixzeit</a>. Die <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle tek_{i}}">

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<annotation encoding="application/x-tex">{\displaystyle tek_{i}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/dab771d6bf455c3a82d5b2fde5b0010440f736a9.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:3.934ex; height:2.509ex;" alt="{\displaystyle tek_{i}}" loading="lazy"> werden jeweils mit dem Startintervall <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle i=\llcorner {\frac {ENIntervalNumber(Startzeitpunkt)}{TEKRollingPeriod}}\lrcorner \times TEKRollingPeriod}">

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<annotation encoding="application/x-tex">{\displaystyle i=\llcorner {\frac {ENIntervalNumber(Startzeitpunkt)}{TEKRollingPeriod}}\lrcorner \times TEKRollingPeriod}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/4bc8d0d133db0167b4cf1ff25329402952e52c34.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.338ex; width:68.011ex; height:6.176ex;" alt="{\displaystyle i=\llcorner {\frac {ENIntervalNumber(Startzeitpunkt)}{TEKRollingPeriod}}\lrcorner \times TEKRollingPeriod}" loading="lazy"> assoziiert. Das ENF speichert die letzten 14 <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle tek_{i}}">

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<annotation encoding="application/x-tex">{\displaystyle tek_{i}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/dab771d6bf455c3a82d5b2fde5b0010440f736a9.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:3.934ex; height:2.509ex;" alt="{\displaystyle tek_{i}}" loading="lazy"> auf dem Endgerät ab.<a href="#cite_note-:1-7">[7]</a>

Durch <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RPIK_{i}=HKDF_{i}(tek_{i},NULL,UTF8('EN-RPIK'),16)}">

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<annotation encoding="application/x-tex">{\displaystyle RPIK_{i}=HKDF_{i}(tek_{i},NULL,UTF8('EN-RPIK'),16)}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/b37cf37135288de11d4de6c48a79d11a67ec080f.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:60.038ex; height:3.009ex;" alt="{\displaystyle RPIK_{i}=HKDF_{i}(tek_{i},NULL,UTF8('EN-RPIK'),16)}" loading="lazy"> und <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle AEMK_{i}=HKDF_{i}(tek_{i},NULL,UTF8('EN-AEMK'),16)}">

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<annotation encoding="application/x-tex">{\displaystyle AEMK_{i}=HKDF_{i}(tek_{i},NULL,UTF8('EN-AEMK'),16)}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/53776a871ea6cb5128141b0e0338a63ef0c9e8ad.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:62.597ex; height:3.009ex;" alt="{\displaystyle AEMK_{i}=HKDF_{i}(tek_{i},NULL,UTF8('EN-AEMK'),16)}" loading="lazy"> ergeben sich die mit HKDF abgeleiteten Schlüssel Rolling Proximity Identifier Key (<math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RPIK_{i}}">

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<annotation encoding="application/x-tex">{\displaystyle RPIK_{i}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/cd75a27119a516a8cb35896587cfab15d2070e17.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:7.454ex; height:2.509ex;" alt="{\displaystyle RPIK_{i}}" loading="lazy">) und Associated Encrypted Metadata Key (<math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle AEMK_{i}}">

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<annotation encoding="application/x-tex">{\displaystyle AEMK_{i}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/6650f56a57bd08062ca1b3348b060462d119c8f2.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:8.734ex; height:2.509ex;" alt="{\displaystyle AEMK_{i}}" loading="lazy">). Für jedes der 144 zehn-minütigen Zeitintervalle können unter Verwendung des <a href="Advanced_Encryption_Standard" title="Advanced Encryption Standard">Advanced Encryption Standard</a> (AES) durch <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RPI_{i,j}=AES_{128}(RPIK_{i},PaddedData_{j})}">

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<annotation encoding="application/x-tex">{\displaystyle RPI_{i,j}=AES_{128}(RPIK_{i},PaddedData_{j})}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/40ccb73231d106b84062d6f841c421aba030ded7.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:41.344ex; height:3.009ex;" alt="{\displaystyle RPI_{i,j}=AES_{128}(RPIK_{i},PaddedData_{j})}" loading="lazy">Rolling Proximity Identifier (<math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RPI_{i,j}}">

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<annotation encoding="application/x-tex">{\displaystyle RPI_{i,j}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/f7e0e8305a48339f0e3c54f178e14436f06df178.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:6.467ex; height:2.843ex;" alt="{\displaystyle RPI_{i,j}}" loading="lazy">) gebildet werden. <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle PaddedData_{j}}">

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<annotation encoding="application/x-tex">{\displaystyle PaddedData_{j}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/f8edd56455135c8e731b0a33aac917145314a730.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:13.84ex; height:2.843ex;" alt="{\displaystyle PaddedData_{j}}" loading="lazy"> besteht dabei aus <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle UTF8('EN-RPI')}">

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<annotation encoding="application/x-tex">{\displaystyle UTF8('EN-RPI')}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/debefb47151a716fe67531eaa2386877e4b1d300.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:20.906ex; height:3.009ex;" alt="{\displaystyle UTF8('EN-RPI')}" loading="lazy">, <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle 0x000000000000}">

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<annotation encoding="application/x-tex">{\displaystyle 0x000000000000}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/018448ca6d82f958cdba244963ab314877046e09.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:16.442ex; height:2.176ex;" alt="{\displaystyle 0x000000000000}" loading="lazy"> sowie <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle ENIntervalNumber(j)}">

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<annotation encoding="application/x-tex">{\displaystyle ENIntervalNumber(j)}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/e7b0b3eef2dbf21349f7d0df4c59fe4e6f65c857.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:23.759ex; height:2.843ex;" alt="{\displaystyle ENIntervalNumber(j)}" loading="lazy"> mit <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle j}">

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<annotation encoding="application/x-tex">{\displaystyle j}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/2f461e54f5c093e92a55547b9764291390f0b5d0.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; margin-left: -0.027ex; width:0.985ex; height:2.509ex;" alt="{\displaystyle j}" loading="lazy"> als Zeitpunkt der <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RPI_{i,j}}">

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<annotation encoding="application/x-tex">{\displaystyle RPI_{i,j}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/f7e0e8305a48339f0e3c54f178e14436f06df178.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:6.467ex; height:2.843ex;" alt="{\displaystyle RPI_{i,j}}" loading="lazy">-Erzeugung. Der <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RPI_{i,j}}">

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<annotation encoding="application/x-tex">{\displaystyle RPI_{i,j}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/f7e0e8305a48339f0e3c54f178e14436f06df178.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:6.467ex; height:2.843ex;" alt="{\displaystyle RPI_{i,j}}" loading="lazy"> fließt dann als Initialisierungsvektor in die Verschlüsselung von Bluetooth-Daten wie der Protokollversion und Signalstärke mit AES im <a href="Counter_Mode" title="Counter Mode">Counter Mode</a>. Durch <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle AEM_{i,j}=AES_{128}-CTR(AEMK_{i},RPI_{i.j},Metadaten)}">

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<annotation encoding="application/x-tex">{\displaystyle AEM_{i,j}=AES_{128}-CTR(AEMK_{i},RPI_{i.j},Metadaten)}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/f41eeb46150d166fbad6d35bbb61587af1b00f1d.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:56.891ex; height:3.009ex;" alt="{\displaystyle AEM_{i,j}=AES_{128}-CTR(AEMK_{i},RPI_{i.j},Metadaten)}" loading="lazy"> entsteht die Associated Encrypted Metadata (<math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle AEM_{i,j}}">

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<annotation encoding="application/x-tex">{\displaystyle AEM_{i,j}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/c80b0581cf7c283e3c55412f2c803c65a810fc5c.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:7.707ex; height:2.843ex;" alt="{\displaystyle AEM_{i,j}}" loading="lazy">). <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RPI_{i,j}}">

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<annotation encoding="application/x-tex">{\displaystyle RPI_{i,j}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/f7e0e8305a48339f0e3c54f178e14436f06df178.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:6.467ex; height:2.843ex;" alt="{\displaystyle RPI_{i,j}}" loading="lazy"> und <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle AEM_{i,j}}">

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<annotation encoding="application/x-tex">{\displaystyle AEM_{i,j}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/c80b0581cf7c283e3c55412f2c803c65a810fc5c.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:7.707ex; height:2.843ex;" alt="{\displaystyle AEM_{i,j}}" loading="lazy"> wechseln parallel zur zufälligen <a href="Bluetooth_Low_Energy" title="Bluetooth Low Energy">BLE</a> <a href="MAC-Adresse" title="MAC-Adresse">MAC-Adresse</a>.<a href="#cite_note-:1-7">[7]</a><a href="#cite_note-8">[8]</a>

Die entstandenen <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RPI_{i,j}}">

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<annotation encoding="application/x-tex">{\displaystyle RPI_{i,j}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/f7e0e8305a48339f0e3c54f178e14436f06df178.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:6.467ex; height:2.843ex;" alt="{\displaystyle RPI_{i,j}}" loading="lazy"> und <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle AEM_{i,j}}">

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<annotation encoding="application/x-tex">{\displaystyle AEM_{i,j}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/c80b0581cf7c283e3c55412f2c803c65a810fc5c.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:7.707ex; height:2.843ex;" alt="{\displaystyle AEM_{i,j}}" loading="lazy"> werden in einem Broadcast via Bluetooth an Geräte in der Umgebung verschickt. Zudem empfängt das Endgerät selbst die <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RPI_{i,j}}">

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<annotation encoding="application/x-tex">{\displaystyle RPI_{i,j}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/f7e0e8305a48339f0e3c54f178e14436f06df178.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:6.467ex; height:2.843ex;" alt="{\displaystyle RPI_{i,j}}" loading="lazy"> und <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle AEM_{i,j}}">

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<annotation encoding="application/x-tex">{\displaystyle AEM_{i,j}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/c80b0581cf7c283e3c55412f2c803c65a810fc5c.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:7.707ex; height:2.843ex;" alt="{\displaystyle AEM_{i,j}}" loading="lazy"> anderer Geräte, die das ENF nutzen, und speichert diese ab.<a href="#cite_note-:1-7">[7]</a>

Liegt ein bestätigtes positives Ergebnis eines <a href="COVID-19" title="COVID-19">COVID-19</a>-Tests vor, können die <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle tek_{i}}">

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<annotation encoding="application/x-tex">{\displaystyle tek_{i}}</annotation>

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</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/dab771d6bf455c3a82d5b2fde5b0010440f736a9.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:3.934ex; height:2.509ex;" alt="{\displaystyle tek_{i}}" loading="lazy"> der letzten 14 Tage mit den zugehörigen <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle i}">

</mstyle>

</mrow>

<annotation encoding="application/x-tex">{\displaystyle i}</annotation>

</semantics>

</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/add78d8608ad86e54951b8c8bd6c8d8416533d20.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:0.802ex; height:2.176ex;" alt="{\displaystyle i}" loading="lazy"> als Diagnosis Keys zu einem designierten Server hochgeladen werden, welcher die Schlüssel verwaltet und den Clients zur Verfügung stellt.<a href="#cite_note-:1-7">[7]</a>

Die Clients können die Diagnosis Keys herunterladen und über die aufgeführten Schritte die <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RPI_{i,j}}">

<msub>

</mrow>

</msub>

</mstyle>

</mrow>

<annotation encoding="application/x-tex">{\displaystyle RPI_{i,j}}</annotation>

</semantics>

</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/f7e0e8305a48339f0e3c54f178e14436f06df178.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:6.467ex; height:2.843ex;" alt="{\displaystyle RPI_{i,j}}" loading="lazy"> infizierter Personen generieren. Durch einen Vergleich der so generierten <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RPI_{i,j}}">

<msub>

</mrow>

</msub>

</mstyle>

</mrow>

<annotation encoding="application/x-tex">{\displaystyle RPI_{i,j}}</annotation>

</semantics>

</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/f7e0e8305a48339f0e3c54f178e14436f06df178.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:6.467ex; height:2.843ex;" alt="{\displaystyle RPI_{i,j}}" loading="lazy"> mit den über Bluetooth gesammelten <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle RPI_{i,j}}">

<msub>

</mrow>

</msub>

</mstyle>

</mrow>

<annotation encoding="application/x-tex">{\displaystyle RPI_{i,j}}</annotation>

</semantics>

</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/f7e0e8305a48339f0e3c54f178e14436f06df178.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:6.467ex; height:2.843ex;" alt="{\displaystyle RPI_{i,j}}" loading="lazy"> lässt sich ermitteln, ob eine Übereinstimmung vorliegt. Ist dies der Fall, liegt ein Risikokontakt vor und die zugehörige <math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle AEM_{i,j}}">

<msub>

</mrow>

</msub>

</mstyle>

</mrow>

<annotation encoding="application/x-tex">{\displaystyle AEM_{i,j}}</annotation>

</semantics>

</math><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/c80b0581cf7c283e3c55412f2c803c65a810fc5c.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:7.707ex; height:2.843ex;" alt="{\displaystyle AEM_{i,j}}" loading="lazy"> wird entschlüsselt, um eine Risikoeinschätzung zu ermöglichen.<a href="#cite_note-:1-7">[7]</a>

<div class="mw-heading mw-heading2"><h2 id="Einstellung">Einstellung</h2></div>

Mitte Oktober 2023 hat Google das ENF aus Android entfernt. Die Änderung wurde mit Google Play Version 23.42 eingeführt.<a href="#cite_note-9">[9]</a>

<div class="mw-heading mw-heading2"><h2 id="Einzelnachweise">Einzelnachweise</h2></div>

<li id="cite_note-1"><a href="#cite_ref-1">↑</a> Jaap-Henk Hoepman: <a rel="nofollow" class="external text" href="https://arxiv.org/pdf/2012.05097">A Critique of the Google Apple Exposure Notification (GAEN) Framework.</a> 12. Januar 2021, abgerufen am 26. März 2021 (englisch).<span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AExposure+Notification&rft.title=A+Critique+of+the+Google+Apple+Exposure+Notification+%28GAEN%29+Framework&rft.description=A+Critique+of+the+Google+Apple+Exposure+Notification+%28GAEN%29+Framework&rft.identifier=https%3A%2F%2Farxiv.org%2Fpdf%2F2012.05097&rft.creator=Jaap-Henk+Hoepman&rft.date=2021-01-12&rft.language=en">

</li>

<li id="cite_note-2"><a href="#cite_ref-2">↑</a> <a rel="nofollow" class="external text" href="https://covid19.apple.com/contacttracing">Privacy-Preserving Contact Tracing.</a> Abgerufen am 25. März 2021 (englisch).<span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AExposure+Notification&rft.title=Privacy-Preserving+Contact+Tracing&rft.description=Privacy-Preserving+Contact+Tracing&rft.identifier=https%3A%2F%2Fcovid19.apple.com%2Fcontacttracing&rft.language=en">

</li>

<li id="cite_note-:0-3">↑ <a href="#cite_ref-:0_3-0">a</a> <a href="#cite_ref-:0_3-1">b</a> <a rel="nofollow" class="external text" href="https://developer.apple.com/documentation/exposurenotification">Apple Developer Documentation - Exposure Notification.</a> Abgerufen am 25. März 2021 (englisch).<span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AExposure+Notification&rft.title=Apple+Developer+Documentation+-+Exposure+Notification&rft.description=Apple+Developer+Documentation+-+Exposure+Notification&rft.identifier=https%3A%2F%2Fdeveloper.apple.com%2Fdocumentation%2Fexposurenotification&rft.language=en">

</li>

<li id="cite_note-4"><a href="#cite_ref-4">↑</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20231005140459/https://developers.google.com/android/exposure-notifications/exposure-notifications-api">Exposure Notifications API.</a> In: <a href="Google_Developers" title="Google Developers">Google Developers</a>. Archiviert vom <style data-mw-deduplicate="TemplateStyles:r250917974">

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</style><a class="external text" href="https://redirecter.toolforge.org/?url=https%3A%2F%2Fdevelopers.google.com%2Fandroid%2Fexposure-notifications%2Fexposure-notifications-api">Original</a> am 5. Oktober 2023; abgerufen am 15. Januar 2025 (englisch, Leitfaden zur Benutzung von ENF in Android-Apps).<span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AExposure+Notification&rft.title=Exposure+Notifications+API&rft.description=Exposure+Notifications+API&rft.identifier=https%3A%2F%2Fweb.archive.org%2Fweb%2F20231005140459%2Fhttps%3A%2F%2Fdevelopers.google.com%2Fandroid%2Fexposure-notifications%2Fexposure-notifications-api&rft.source=https://developers.google.com/android/exposure-notifications/exposure-notifications-api&rft.language=en">

</li>

<li id="cite_note-5"><a href="#cite_ref-5">↑</a> <a rel="nofollow" class="external text" href="https://developer.apple.com/contact/request/download/Exposure_Notification_Addendum.pdf">Exposure Notification APIs Addendum.</a> 5. April 2020, S. 1, abgerufen am 25. März 2021 (englisch).<span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AExposure+Notification&rft.title=Exposure+Notification+APIs+Addendum&rft.description=Exposure+Notification+APIs+Addendum&rft.identifier=https%3A%2F%2Fdeveloper.apple.com%2Fcontact%2Frequest%2Fdownload%2FExposure_Notification_Addendum.pdf&rft.date=2020-04-05&rft.language=en">

</li>

<li id="cite_note-6"><a href="#cite_ref-6">↑</a> <a rel="nofollow" class="external text" href="https://www.coronawarn.app/assets/documents/cwa-datenschutz-folgenabschaetzung.pdf">Bericht zur Datenschutzfolgeabschätzung für die Corona Warn App der Bundesrepublik Deutschland.</a> Robert Koch-Institut, 2. März 2021, S. 15, abgerufen am 25. März 2021.<span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AExposure+Notification&rft.title=Bericht+zur+Datenschutzfolgeabsch%C3%A4tzung+f%C3%BCr+die+Corona+Warn+App+der+Bundesrepublik+Deutschland&rft.description=Bericht+zur+Datenschutzfolgeabsch%C3%A4tzung+f%C3%BCr+die+Corona+Warn+App+der+Bundesrepublik+Deutschland&rft.identifier=https%3A%2F%2Fwww.coronawarn.app%2Fassets%2Fdocuments%2Fcwa-datenschutz-folgenabschaetzung.pdf&rft.publisher=Robert+Koch-Institut&rft.date=2021-03-02">

</li>

<li id="cite_note-:1-7">↑ <a href="#cite_ref-:1_7-0">a</a> <a href="#cite_ref-:1_7-1">b</a> <a href="#cite_ref-:1_7-2">c</a> <a href="#cite_ref-:1_7-3">d</a> <a href="#cite_ref-:1_7-4">e</a> <a href="#cite_ref-:1_7-5">f</a> Apple Inc., Google LLC: <a rel="nofollow" class="external text" href="https://covid19-static.cdn-apple.com/applications/covid19/current/static/contact-tracing/pdf/ExposureNotification-CryptographySpecificationv1.2.pdf?1">Exposure Notification Cryptography Specification.</a> 2021, abgerufen am 26. März 2021 (englisch).<span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AExposure+Notification&rft.title=Exposure+Notification+Cryptography+Specification&rft.description=Exposure+Notification+Cryptography+Specification&rft.identifier=https%3A%2F%2Fcovid19-static.cdn-apple.com%2Fapplications%2Fcovid19%2Fcurrent%2Fstatic%2Fcontact-tracing%2Fpdf%2FExposureNotification-CryptographySpecificationv1.2.pdf%3F1&rft.creator=Apple+Inc.%2C+Google+LLC&rft.date=2021&rft.language=en">

</li>

<li id="cite_note-8"><a href="#cite_ref-8">↑</a> Apple Inc., Google LLC: <a rel="nofollow" class="external text" href="https://covid19-static.cdn-apple.com/applications/covid19/current/static/contact-tracing/pdf/ExposureNotification-BluetoothSpecificationv1.2.pdf?1">Exposure Notification Bluetooth Specification.</a> 2021, abgerufen am 26. März 2021 (englisch).<span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AExposure+Notification&rft.title=Exposure+Notification+Bluetooth+Specification&rft.description=Exposure+Notification+Bluetooth+Specification&rft.identifier=https%3A%2F%2Fcovid19-static.cdn-apple.com%2Fapplications%2Fcovid19%2Fcurrent%2Fstatic%2Fcontact-tracing%2Fpdf%2FExposureNotification-BluetoothSpecificationv1.2.pdf%3F1&rft.creator=Apple+Inc.%2C+Google+LLC&rft.date=2021&rft.language=en">

</li>

<li id="cite_note-9"><a href="#cite_ref-9">↑</a> <a rel="nofollow" class="external text" href="https://9to5google.com/2023/11/03/android-covid-19-exposure-notification-settings-removal/">Google has removed Android’s COVID-19 exposure notification settings.</a> 3. November 2023, abgerufen am 22. November 2024 (englisch).<span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AExposure+Notification&rft.title=Google+has+removed+Android%E2%80%99s+COVID-19+exposure+notification+settings&rft.description=Google+has+removed+Android%E2%80%99s+COVID-19+exposure+notification+settings&rft.identifier=https%3A%2F%2F9to5google.com%2F2023%2F11%2F03%2Fandroid-covid-19-exposure-notification-settings-removal%2F&rft.date=2023-11-03&rft.language=en">

</li>

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