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Slightly expand/clarify phrasing on quantum resistance

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Heiko Schaefer 2023-11-01 21:25:24 +01:00
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book/source/03-cryptography.md
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@ -46,16 +46,10 @@ A symmetric cryptographic key (which acts as a shared secret)
### Benefits and downsides
Symmetric-key cryptography has major benefits: It is much faster than public-key cryptography (see below). Also, most current symmetric cryptographic algorithms are considered quantum-resistant[^postquantum].
Symmetric-key cryptography has major benefits: It is much faster than public-key cryptography (see below). Also, most current symmetric-key cryptographic mechanisms are believed to be resilient against possible advances in quantum computing[^postquantum].
[^postquantum]: Daniel J. Bernstein (2009). ["Introduction to post-quantum cryptography" (PDF)](http://www.pqcrypto.org/www.springer.com/cda/content/document/cda_downloaddocument/9783540887010-c1.pdf) states that: "many important classes of cryptographic systems", including secret-key cryptographic mechanisms like AES "[..] are believed to resist classical computers and quantum computers." (pages 1, 2).
```{admonition} TODO
:class: warning
I am not convinced that this information is helpful but, if it remains, perhaps we need this additional statement: "That is, symmetric-key cryptographic mechanisms are currently considered to be resilient against known computer threats, providing a measure of assurance in the evolving landscape of cryptography and quantum computing."
```
However, exchanging the required shared secret is a problem that needs to be solved separately.
[Hybrid cryptosystems](hybrid_cryptosystems) combine the advantages of symmetric-key cryptography with a separate mechanism for managing the shared secret, using public-key cryptography.