Add glossary entries and links for chapter 1 - 4 and 6

Signed-off-by: David Runge <dave@sleepmap.de>

book/source/02-highlevel.md

@@ -11,11 +11,11 @@ OpenPGP is a widely recognized, IETF-standardized set of cryptographic operation
 
 There are other compelling reasons for why you might consider using OpenPGP in your project:
 
-1. **Decentralized trust model**: OpenPGP's decentralization defines mechanisms for authentication that allow individuals and entities to create and manage their own cryptographic identities. Unlike centralized trust models, decentralized trust models empower individuals and entities to manage their own identities, fostering a community-driven web of trust instead of relying on a centralized authority, thus reducing single points of failure.  
+1. **Decentralized trust model**: OpenPGP's decentralization defines mechanisms for {term}`authentication` that allow individuals and entities to create and manage their own cryptographic {term}`identities<Identity>`. Unlike centralized {term}`trust models<Trust Model>`, decentralized {term}`trust models<Trust Model>` empower individuals and entities to manage their own {term}`identities<Identity>`, fostering a community-driven web of trust instead of relying on a centralized authority, thus reducing single points of failure.
 
-2. **End-to-end encryption**: OpenPGP provides a robust framework for implementing end-to-end encryption. Content remains confidential, verifiable, authenticated, and protected against unauthorized access, even when the communication channel itself might be otherwise compromised. Encryption is crucial in a myriad of scenarios, particularly when transmitting sensitive information such as financial data, personally identifiable information (PII), or proprietary business data.
+2. **End-to-end encryption**: OpenPGP provides a robust framework for implementing end-to-end encryption. Content remains confidential, verifiable, {term}`authenticated<Authentication>`, and protected against unauthorized access, even when the communication channel itself might be otherwise compromised. Encryption is crucial in a myriad of scenarios, particularly when transmitting sensitive information such as financial data, personally identifiable information (PII), or proprietary business data.
 
-3. **Anonymity and pseudonymity**: In sensitive and volatile situations where identity protection is crucial, OpenPGP can be used to provide a level of anonymity or pseudonymity that helps protect user identities. For example, OpenPGP has been used alongside other privacy tools, such as Tor and VPNs, to provide secure and anonymous communication for whistleblowers, human rights lawyers, activists in repressive regimes, and journalists, reducing their risks for retaliation and state violence.
+3. **Anonymity and pseudonymity**: In sensitive and volatile situations where identity protection is crucial, OpenPGP can be used to provide a level of anonymity or pseudonymity that helps protect user identities. For example, OpenPGP has been used alongside other privacy tools, such as [Tor](https://en.wikipedia.org/wiki/The_Tor_Project) and [VPN](https://en.wikipedia.org/wiki/Virtual_private_network)s, to provide secure and anonymous communication for whistleblowers, human rights lawyers, activists in repressive regimes, and journalists, reducing their risks for retaliation and state violence.
 
 4. **Interoperability**: OpenPGP is a well-structured and standardized protocol, widely adopted by various public and private entities but not tied to any particular vendor's technology. It supports all major operating systems, such as Windows, macOS, GNU/Linux, Android, and iOS. Because of standardization, wide adoption, cross-platform compatibility, and adaptability, OpenPGP's interoperability significantly contributes to reducing development time, costs, and technical hurdles.
 
@@ -100,12 +100,12 @@ Initial efforts to incorporate support for OpenPGP version 6 have been undertake
 
 ### Post-quantum cryptography in OpenPGP
 
-There is [ongoing work](https://datatracker.ietf.org/doc/draft-wussler-openpgp-pqc/) to standardize and add support for post-quantum public-key algorithms in OpenPGP. This project is funded by the [german "BSI"](https://en.wikipedia.org/wiki/Federal_Office_for_Information_Security). Goals include adding support for post-quantum cryptography to Thunderbird and GnuPG. A [presentation](https://datatracker.ietf.org/meeting/113/materials/slides-113-openpgp-a-post-quantum-approach-for-openpgp-00) was given at [IETF 113](https://datatracker.ietf.org/meeting/113/session/openpgp/).
+There is [ongoing work](https://datatracker.ietf.org/doc/draft-wussler-openpgp-pqc/) to standardize and add support for post-quantum {term}`public-key algorithms<Public Key Algorithm>` in OpenPGP. This project is funded by the [german "BSI"](https://en.wikipedia.org/wiki/Federal_Office_for_Information_Security). Goals include adding support for post-quantum cryptography to Thunderbird and GnuPG. A [presentation](https://datatracker.ietf.org/meeting/113/materials/slides-113-openpgp-a-post-quantum-approach-for-openpgp-00) was given at [IETF 113](https://datatracker.ietf.org/meeting/113/session/openpgp/).
 
 ## Zooming in: Internal structure of OpenPGP data
 
 OpenPGP data is internally structured as "packets." We'll look into examples of this internal structure in a series of chapters at the end of this document.
 
-Getting familiar with the internal format of OpenPGP data provides practical insight into the [RFC](https://datatracker.ietf.org/doc/draft-ietf-openpgp-crypto-refresh/), which describes the internal structure of OpenPGP packets in full detail, and may also come in handy for debugging issues.
+Getting familiar with the internal format of OpenPGP data provides practical insight into the [RFC](https://datatracker.ietf.org/doc/draft-ietf-openpgp-crypto-refresh/), which describes the internal structure of OpenPGP {term}`packets<Packet>` in full detail, and may also come in handy for debugging issues.
 
 (Most of the time, however, we will look at OpenPGP artifacts at a higher level of abstraction.)