The document provides information about X509 certificate serial numbers and validity periods. It explains that a serial number is a unique identifier assigned by the issuer to distinguish the certificate from others, with valid values ranging from 1 to 2147483647. The validity period refers to the number of days the certificate is valid from the date of issuance, with a maximum validity of 20 years for certificates issued by the certificate assistant.
documents/EFTA00289903.pdf
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