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Adjust styling of "one-pass" in the nesting section

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Heiko Schaefer 2023-12-23 04:01:07 +01:00
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book/source/adv/signing_data.md
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@ -116,16 +116,16 @@ However, when a signer creates a {term}`prefixed signed message`, the signed dat
## Nesting of one-pass signatures
Signing a message using the one-pass mechanism involves prepending a *One-Pass-Signature* (OPS) packet to the message and appending the corresponding signature, sandwiching the signed content.
Signing a message using the one-pass mechanism involves prepending a *one-pass signature* (OPS) packet to the message and appending the corresponding signature, sandwiching the signed content.
An OpenPGP message can contain multiple signatures added that way.
```{note}
One-Pass-Signatures are nested, meaning the outermost One-Pass-Signature packet corresponds to the outermost signature packet.
One-pass signatures are nested, meaning the outermost one-pass signature packet corresponds to the outermost signature packet.
```
When a message is signed, the signature is always calculated over the contents of the literal data packet, not the literal data packet itself.
This means that if a message, which is compressed using a compressed data packet is wrapped using a one-pass-signature, the signature is still being calculated over the plaintext inside the literal data packet.
This means that if a message, which is compressed using a compressed data packet is wrapped using a one-pass signature, the signature is still being calculated over the plaintext inside the literal data packet.
There is one exception, though.
```{note}
@ -137,20 +137,20 @@ If this flag is set to `0`, it indicates that further OPSs will follow this pack
[^nested-flag]: See [description of the nested flag](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#section-5.4-3.8.1).
This mechanism enables attested signatures, where the signer signs an already one-pass-signed message including the already contained signature.
This mechanism enables attested signatures, where the signer signs an already one-pass signed message including the already contained signature.
As a practical example, consider the following notation:
* `LIT("Hello World")` represents a literal data packet with the content `Hello World`.
* `COMP(XYZ)` represents a compressed data packet over some other packet `XYZ`.
* `OPS₁` represents a one-pass-signature packet with the nested flag set to `1`. Analogous, `OPS₀` has the nested flag set to `0`.
* `OPS₁` represents a one-pass signature packet with the nested flag set to `1`. Analogous, `OPS₀` has the nested flag set to `0`.
* `SIG` represents a signature packet.
A normal, one-pass-signed message looks like this:
A normal, one-pass signed message looks like this:
`OPS₁ LIT("Hello World") SIG`
Here, the signature is calculated over the plaintext `Hello World`, as is it in a message that has the following form: `OPS₁ COMP(LIT("Hello World")) SIG`.
A message, where multiple one-pass-signatures are calculated over the same plaintext looks the following:
A message, where multiple one-pass signatures are calculated over the same plaintext looks the following:
`OPS₀ OPS₀ OPS₁ LIT("Hello World") SIG SIG SIG`
All three signatures are calculated over the same plaintext `Hello World`.