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removed "particularly", because for inline signatures, this issue doesn't exist at all. added the "cleartext" case, which is equivalent here.

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Heiko Schaefer 2023-11-14 13:20:14 +01:00
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book/source/07-signing_data.md
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@ -22,8 +22,8 @@ Note that data signatures are distinct from {ref}`component_signatures_chapter`,
OpenPGP data signatures use one of two [signature types](signature_types): OpenPGP data signatures use one of two [signature types](signature_types):
- **Binary signature** (type ID `0x00`): This is the standard signature type for binary data and is typically used for files or data streams. Binary signatures are calculated over the data without any modifications or transformations. - [**Binary signature**](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#sigtype-binary) (type ID `0x00`): This is the standard signature type for binary data and is typically used for files or data streams. Binary signatures are calculated over the data without any modifications or transformations.
- **Text signature** (type ID `0x01`): Used for textual data, such as email bodies. When calculating a text signature, the data is first normalized by converting line endings into a canonical form (`<CR><LF>`). This mitigates issues caused by platform-specific text encodings, which is particularly important for detached signatures where the message file might be re-encoded between signature creation and verification. - [**Text signature**](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#name-signature-of-a-canonical-te) (type ID `0x01`): Used for textual data, such as email bodies. When calculating a text signature, the data is first normalized by converting line endings into a canonical form (`<CR><LF>`). This mitigates issues caused by platform-specific text encodings, which is important for detached and cleartext signatures where the message file might be re-encoded between signature creation and verification.
Data signatures are generated by hashing the message content along with the metadata in the signature packet, and calculating a cryptographic signature over that hash. The resulting cryptographic signature is stored in an OpenPGP signature packet. Data signatures are generated by hashing the message content along with the metadata in the signature packet, and calculating a cryptographic signature over that hash. The resulting cryptographic signature is stored in an OpenPGP signature packet.