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ch4: work on structure

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Move introduction of asymmetric key pairs and diagrams to ch3.
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Heiko Schaefer 2023-09-25 14:10:54 +02:00
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book/source/03-cryptography.md
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# Cryptographic concepts/terms
```
Lars suggests that we should have a place where we introduce cryptographic terms that we use, and give short definitions (without getting into how specific algorithms work)
Lars suggests that we should have a chapter where we introduce cryptographic terms that we use, and give short definitions (without getting into how specific algorithms work)
This would be a good place to introduce visualizations for cryptographic primitives
```
```
## Public-key cryptography
https://en.wikipedia.org/wiki/Public-key_cryptography
### Asymmetric cryptographic key pairs
In many places, we'll deal with asymmetric cryptographic key pairs:
![Image](diag/cryptographic_keys.png "A cryptographic keypair")
A cryptographic key pair consists of a public and a private part. In this document, we'll show the public part of a cryptographic key in green, and the private part in red.
We'll usually visualize cryptographic keypairs in this more compact form:
![Image](diag/keypair.png "A cryptographic keypair")
Note that in many contexts, only the public part is present (more on that later):
![Image](diag/keypair_pub.png "Only the public part of a cryptographic keypair")
### Public-key cryptography in OpenPGP
OpenPGP makes heavy use of public-key cryptography. However, for historical reasons, OpenPGP uses the terms "public/secret" instead of "public/private."
So when reading the RFC, or other documentation, you will encounter the term "secret key," instead of the more common "private key."
### Symmetric encryption
https://en.wikipedia.org/wiki/Symmetric-key_algorithm
[TODO: visualization?]
#### Symmetric cryptography in OpenPGP
Symmetric encryption is a core concept in OpenPGP. It usually comes up involving the term "session key."
"Session keys" in OpenPGP are symmetric cryptographic keys.