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Tammi L. Coles 2024-01-19 14:31:46 +01:00
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book/source/adv/signatures.md
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@ -8,11 +8,11 @@ SPDX-License-Identifier: CC-BY-SA-4.0
(notation-signature-subpackets)=
## Notation signature subpackets
[Notation signature subpackets](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#notation-data) can be used to effectively extend the otherwise limited set of {term}`signature subpacket types<OpenPGP Signature Subpacket Type>` in OpenPGP with user-defined {term}`notations<Notation>`. {term}`Issuers<Issuer>` can use these {term}`notations<Notation>` to add name-value pairs to an {term}`OpenPGP signature<OpenPGP Signature Packet>`.
[Notation signature subpackets](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#notation-data) can extend the otherwise limited set of {term}`signature subpacket types<OpenPGP Signature Subpacket Type>` in OpenPGP with user-defined {term}`notations<Notation>`. {term}`Issuers<Issuer>` can use these {term}`notations<Notation>` to add name-value pairs to an {term}`OpenPGP signature<OpenPGP Signature Packet>`.
{term}`Notation` names - strings encoded in UTF-8 - may reside in the "user namespace." This namespace is characterized by a {term}`notation tag`, followed by a DNS domain name, both in UTF-8 format.
{term}`Notation` names – strings encoded in UTF-8 – may reside in the "user namespace." In this namespace, each notation is identified by a {term}`notation tag`, which is followed by a DNS domain name. Both the notation tag and the domain name are encoded in UTF-8 format.
{term}`Notations<Notation>`, as described earlier, allow for user-defined extensions to the {term}`OpenPGP signature subpacket types<OpenPGP Signature Subpacket Type>`. A practical and popular application of this functionality is seen in Keyoxide, a decentralized {term}`identity verification` service. Keyoxide uses {term}`notations<Notation>` in the `ariadne.id` namespace. For the details of this {term}`implementation<OpenPGP Implementation>`, refer to the [Keyoxide documentation](https://docs.keyoxide.org/wiki/ariadne-identity/).
{term}`Notations<Notation>` allow for user-defined extensions to the {term}`OpenPGP signature subpacket types<OpenPGP Signature Subpacket Type>`. A practical and popular example of this functionality is applied in Keyoxide, a decentralized {term}`identity verification` service. Keyoxide uses {term}`notations<Notation>` in the `ariadne.id` namespace. For the details of this {term}`implementation<OpenPGP Implementation>`, refer to the [Keyoxide documentation](https://docs.keyoxide.org/wiki/ariadne-identity/).
## Choosing the hash algorithm for a signature