# Google-Apple Exposure Notification ## Identification Google-Apple Exposure Notification (GAEN) was a privacy-preserving framework introduced in 2020 to help public-health authorities notify users of possible [[SARS-CoV-2]] exposure. Apple and Google announced the joint Bluetooth effort on April 10, 2020 and released the initial APIs in May 2020. Participating phones broadcast and retain frequently changing Bluetooth identifiers. After a verified positive diagnosis and user authorization, diagnosis keys could be made available so other participating phones could perform exposure matching. The core design did not require GPS, blockchain, 5G, a persistent public identifier, or a centralized social graph. ## Exposure Notifications Express Exposure Notifications Express—usually written **EN Express**, sometimes **ENX**—was not a different proximity protocol. Introduced with iOS 13.7 in September 2020, it reduced the implementation burden on public-health authorities by allowing regional configuration of the existing Exposure Notification framework without requiring each authority to build a full standalone iOS application. Apple states that Exposure Notifications became unavailable on September 18, 2023. ## Notebook evidence - [[Scanned_20260730-1946|Scanned_20260730-1946]], PDF pages 13 and 16. - The exact phrase `Google-Apple Exposure Notification` does not appear in the transcription; it is the verified technical baseline used to contextualize the notebook's broader contact-tracing thesis. ## What the framework did—and did not—establish GAEN estimated possible device proximity under public-health risk parameters. It did not establish that two identified people met, that transmission occurred, or that a user was infected. Its privacy design materially constrained centralized tracking, but implementation, adoption, verification servers, public-health policy, operating-system control, and the surrounding institutional ecosystem remain legitimate governance subjects. GAEN should not be used as shorthand for every form of [[Contact Tracing]]. Other systems used centralized encounter disclosure, QR venue records, GPS, cell-site, CCTV, travel, or payment data. Conversely, risks associated with those broader systems should not be attributed to GAEN without evidence. ## Archive relationship Bryant McGill states that early information from a contact-tracing developer and engineers associated with the [[Bluetooth Special Interest Group|Bluetooth SIG]] informed the notebook's industrial-grid interpretation. That account is preserved as first-person provenance. It does not by itself establish that GAEN secretly implemented the notebook's broader [[Industrial supergrid]] or [[Social sorting]] model. ## Relationships [[Contact Tracing]] · [[COVID-19]] · [[SARS-CoV-2]] · [[Epidemiology]] · [[Bluetooth|Bluetooth Low Energy]] · [[Bluetooth Special Interest Group]] · privacy · [[Social sorting]] · [[Dual-use infrastructure]] ## Sources - [Apple — April 2020 announcement](https://www.apple.com/au/newsroom/2020/04/apple-and-google-partner-on-covid-19-contact-tracing-technology/) - [Google — Exposure Notification API launch, May 2020](https://blog.google/company-news/inside-google/company-announcements/apple-google-exposure-notification-api-launches/) - [Apple Developer — Exposure Notification overview and termination notice](https://developer.apple.com/exposure-notification/) - [Apple Developer — Supporting Exposure Notifications Express](https://developer.apple.com/documentation/exposurenotification/supporting-exposure-notifications-express) - [Apple Developer — Configuring Exposure Notifications](https://developer.apple.com/documentation/exposurenotification/configuring-exposure-notifications)