Re: [Cbor] [COSE] European Digital Health Certificates (used in European Digital Green Certificates = Vaccination certs)
Carsten Bormann <cabo@tzi.org> Sat, 12 June 2021 15:38 UTC
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From: Carsten Bormann <cabo@tzi.org>
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Date: Sat, 12 Jun 2021 17:37:59 +0200
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To: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [Cbor] [COSE] European Digital Health Certificates (used in European Digital Green Certificates = Vaccination certs)
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On 2021-06-12, at 16:53, Michael Richardson <mcr+ietf@sandelman.ca> wrote: > > My understanding is that QRcode can use the entire 8-bits. Am I wrong? As usual, this is less about what QRcode *can* do (there is a nice binary encoding in there), but about what you can get by all the broken stuff that is out there. So the canonical way to handle this today is: (1) Use the “alphanumeric” 45-character set defined by QR-Code specs as upper case letters + digits + space (!) + »$%*+-./:« (2) Use all these characters — even though 2**16**(1/3) is 40.317473596635935 (45**3 = 91125, way more than 65536), so 41 out of these characters would really suffice - don’t avoid the risky characters. (3) Suffer. >> Maybe we can find someone to talk about practical aspects of DGC and >> related efforts at one of the next CBOR interims... > > Actually, I think it belongs as a IAB Tech plenary talk. Not a bad idea, but probably requires significant preparation. Grüße, Carsten
- [Cbor] European Digital Health Certificates (used… Carsten Bormann
- Re: [Cbor] [COSE] European Digital Health Certifi… Michael Richardson
- Re: [Cbor] [COSE] European Digital Health Certifi… Carsten Bormann