diff --git a/book/source/03-cryptography.md b/book/source/03-cryptography.md
index 4c9fd57..ac3021e 100644
--- a/book/source/03-cryptography.md
+++ b/book/source/03-cryptography.md
@@ -31,13 +31,19 @@ Participants in symmetric-key operations need to exchange the shared secret over
 
 ### 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 cryptographic algorithms are considered quantum-resistant[^postquantum].
+
+```{admonition} 
+: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."
 
 [^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).
+```
 
 However, exchanging the required shared secret is a problem that needs to be solved separately.
 
-[Hybrid cryptosystems](hybrid_cryptosystems) (see below) are one common approach to leverage the benefits of symmetric-key cryptography, while handling the shared secret with a separate mechanism (using public-key cryptography).
+[Hybrid cryptosystems](hybrid_cryptosystems) combine the advantages of symmetric-key cryptography with a separate mechanism for managing the shared secret, using public-key cryptography.
 
 ### Symmetric-key cryptography in OpenPGP