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ch6: add short text about notations

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Heiko Schaefer 2023-10-28 17:17:55 +02:00
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book/source/06-signatures.md
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@ -92,7 +92,15 @@ RFC Sections [5.2.3.11](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypt
## Advanced topics
### Notations
### Notation signature subpackets
[Notations](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#notation-data) are a signature subpacket type that can be used to effectively extend the otherwise limited set of signature subpacket types with user-defined notations. An issuer can use notations to add name-value data to an OpenPGP signature.
Notation names are UTF-8 encoded strings. They may reside in the "user namespace," which means a notation *tag* (in UTF-8 string format) followed by a DNS domain name.
#### Use of notations by Keyoxide
Notations have, for example, been used for the popular decentralized identity verification service [Keyoxide](https://keyoxide.org/). Keyoxide uses notations in the `ariadne.id` namespace. See the [Keyoxide documentation](https://docs.keyoxide.org/wiki/ariadne-identity/) for more details.
### "Negotiating" signature hash algorithm based on recipients preference subpackets