The document provides information about the serial number and validity period for X509 certificates. It explains that the serial number is a unique identifier given by the issuer to distinguish the certificate from others, and it must be between 1 and 2147483647. The validity period refers to the number of days the certificate can be used from the date of issuance, with a maximum validity of 20 years for certificates issued by a certificate assistant.
documents/EFTA00289923.pdf
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