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expand on hybrid concept, mark for move

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Tammi L. Coles 2023-10-13 17:47:58 +02:00 committed by Heiko Schaefer
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book/source/03-cryptography.md
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@ -128,10 +128,14 @@ Digital signatures in OpenPGP are used in two primary contexts:
(hybrid_cryptosystems)= (hybrid_cryptosystems)=
## Hybrid cryptosystems ## Hybrid cryptosystems
OpenPGP uses a hybrid cryptosystem. [Hybrid cryptosystems](https://en.wikipedia.org/wiki/Hybrid_cryptosystem) combine the use of symmetric and asymmetric (public-key) cryptography to capitalize on the strengths of each. OpenPGP uses a hybrid cryptosystem. [Hybrid cryptosystems](https://en.wikipedia.org/wiki/Hybrid_cryptosystem) combine the use of symmetric and asymmetric (public-key) cryptography to capitalize on the strengths of each, namely symmetric cryptography's speed and efficiency and public-key cryptography's mechanism for secure key exchange.
```{admonition}
:class: warning
Move this to the chapter that details it:
Within OpenPGP's hybrid system, so-called "session keys" are central. They are generated uniquely for each session and are instrumental in both encrypting and decrypting the actual message content, using the efficiency of symmetric-key cryptography. Within OpenPGP's hybrid system, so-called "session keys" are central. They are generated uniquely for each session and are instrumental in both encrypting and decrypting the actual message content, using the efficiency of symmetric-key cryptography.
Using asymmetric (public-key) cryptography, the session keys are also encrypted. This ensures that only the intended recipient, the holder of the corresponding private key, can decrypt and gain access to the session key. With the decrypted session key, they can then use the session key to decrypt the actual message. Using asymmetric (public-key) cryptography, the session keys are also encrypted. This ensures that only the intended recipient, the holder of the corresponding private key, can decrypt and gain access to the session key. With the decrypted session key, they can then use the session key to decrypt the actual message.
```
OpenPGP's dual-layered security thus capitalizes on symmetric cryptography's speed and efficiency and asymmetric (public-key) cryptography's mechanism for secure key exchange.