diff --git a/book/source/04-certificates.md b/book/source/04-certificates.md
index 48f943a..49d50f6 100644
--- a/book/source/04-certificates.md
+++ b/book/source/04-certificates.md
@@ -9,7 +9,7 @@ The term "(cryptographic) keys" is central to grasping the concept of OpenPGP ce
 
 ### Public vs. private keys
 
-The term "key," without additional context, can refer to either public or private asymmetric key material. In asymmetric cryptography, fundamental to the OpenPGP standard, a pair of keys is used: a public key for encryption and a corresponding private key for decryption. The public key is shared openly, allowing others to encrypt data meant for the individual who owns the key pair, while the private key is kept confidential by the key pair owner, ensuring only they can decrypt and access the encrypted data. Additionally, symmetric keys may be used in OpenPGP to encrypt private key material, adding a layer of security and complexity.
+The term "key," without additional context, can refer to either public or private asymmetric key material. Additionally, symmetric keys may be used in OpenPGP to encrypt private key material, adding a layer of security and complexity.
 
 ### Layers of keys in OpenPGP