The document provides definitions for X509 certificate serial numbers and validity periods. It explains that a serial number is assigned by the issuer to distinguish the certificate from others, with valid numbers ranging from 1 to 2147483647. It also describes the validity period as the duration for which the certificate is valid from the time of issuance, with a maximum validity period of 20 years for certificates issued by a certification authority.
documents/EFTA00289912.pdf
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