The document provides an explanation of the serial number and validity period of X509 certificates. The serial number is assigned by the issuer to distinguish the certificate from others, with valid numbers ranging from 1 to 2147483647. The validity period refers to the duration (in days) from the issuance of the certificate, with a maximum validity of 20 years for certificates issued by the Certificate Assistant.
documents/EFTA00289911.pdf
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