Applied Cryptography

Applied Cryptography Robust Software Quantum Safety Machine Learning Applied to Security Analysis and Exploration of Vulnerabilities Computer Systems Forensic Analysis Reverse Engineering Identification, Authentication and Authorization Secure Execution Environments Direito da Organização e da Segurança

Applied Cryptography
Classical (Symmetric) Cryptography
Modern Symmetric Cryptography
Cipher Modes
Cryptographic Hashing
RSA & Related Subjects
Asymmetric Key Management
Digital Signatures

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Validity of signatures

PreviousCertificate revocation lists (CRL)NextDistribution of public key certificates

Last updated 9 months ago

A signature is valid if it was generated during the validity period of the corresponding pub key certificate.

The validity period starts on the certificate’s NotBefore date field.
By default, the validity ends on the NotAfter date field.
- Unless revoked.

A private key can be used out of that period.

But the signature it produces is invalid.

A public key certificate can be used anytime.

Namely, after the validity period to check past signatures.