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Update event_registration.md

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Thomas Augsten 2021-04-01 17:00:04 +02:00 committed by GitHub
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@ -115,10 +115,10 @@ message CWALocationData {
The ID of a venue is derived as the SHA-256 hash of the concatenated byte representation of the string `CWA-GUID` and the byte representation of the Protocol Buffer message `QRCodePayload`. The `cryptographicSeed` adds sufficient entropy so that any modifications to the QR result in a unique ID.
A `QRCodePayload` is base32-encoded and included in a URL. The URL is the content of the QR code and structures as follows:
A `QRCodePayload` is base64-encoded and included in a URL. The URL is the content of the QR code and structures as follows:
```text
https://e.coronawarn.app?v=1#<base64-url_encoded>
https://e.coronawarn.app?v=1#<base64_encoded>
# example:
CWA Germany:
@ -129,7 +129,6 @@ CLEA FR:
https://tac.gouv.fr?v=1#Y2xlYQ==
```
The base32 encoding allows to leverage the input mode _alphanumeric_ when generating the QR code and produces a QR code with a lower density compared to base64 encoding.
### QR Code Compatibility with Other Contract Tracing Apps in Germany DRAFT