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Cryptographic concepts/terms
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:
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:
Note that in many contexts, only the public part is present (more on that later):
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.