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ch4: fix flow/logic

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Heiko Schaefer 2023-11-22 17:36:31 +01:00
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book/source/04-certificates.md
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@ -199,7 +199,7 @@ Commonly used key flags include:
[^auth-flag]: Note that the capability offered by the [authentication](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#name-authentication-via-digital-) key flag is unrelated to "authentication" in the context of certifying and verifying OpenPGP identities and their connection to certificates. This key flag is about a mechanism that proves control of private key material to a remote system, using cryptographic signatures.
```{note}
Distinct component keys handle specific operations. Only the primary key can be used for certification, although it can have additional capabilities. Subkeys can be used for signing, encryption, and authentication but cannot have the certification capability. It is considered good practice, however, to [use separate keys for each capability](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#section-10.1.5-7).
Distinct component keys handle specific operations. Only the primary key can be used for certification, although it can have additional capabilities. Subkeys can be used for signing, encryption, and authentication but cannot have the certification capability. A component key can technically have multiple capabilities. It is considered good practice, however, to [use separate keys for each capability](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#section-10.1.5-7).
Notably, in many algorithms, encryption and signing-related functionalities (i.e., certification, signing, authentication) are mutually exclusive, because the algorithms only support one of those two families of operations[^key-flag-sharing].
```