Documentation on the Apple site: https://developer.apple.com/documentation/exposurenotification https://developer.apple.com/documentation/exposurenotificati...

Documentation on the Apple site: https://developer.apple.com/documentation/exposurenotification https://developer.apple.com/documentation/exposurenotificati... https://www.apple.com/covid19/contacttracing/ https://www.apple.com/covid19/contacttracing/ Exposure Notification - Cryptography Specification v1.2: https://covid19-static.cdn-apple.com/applications/covid19/current/static/contact-tracing/pdf/ExposureNotification-CryptographySpecificationv1.2.pdf https://covid19-static.cdn-apple.com/applications/covid19/cu... The revision history of Cryptography Specification: v1.2 - April 29, 2020 • Renamed EKRollingPeriod to TEKRollingPeriod. • Renamed Associated Metadata Encryption Keys to Associated Encrypted Metadata Keys. • Made grammatical corrections. v1.1 - April 23, 2020 • Renamed “Contact Tracing” to “Exposure Notification” throughout the document. • Temporary Exposure Keys (previously known as Daily Tracing Keys) are now randomly generated and no longer derived. • AES is now used instead of HMAC<SHA256> for improved performance. • Encryption of associated metadata is now provided. • Reformatted the title page and table of contents for consistency across documents.