introduce validity section

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Tammi L. Coles 2024-02-05 11:47:19 +01:00
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@ -21,6 +21,8 @@ In this chapter, we aim to delve deeper into the advanced concepts surrounding O
## Certificate validity and expiration
Maintaining the validity of OpenPGP certificates is essential for the security and reliability of cryptographic communications. Expiration dates play a key role in this process, acting as a built-in check that prompts users to review and renew their certificates periodically.
Certificates are composites of components that are linked together using [signatures](../signing_components).
A certificate can be valid or invalid as a whole. However, even when a certificate is valid, individual components (subkeys or identities) of it can be invalid.