The document provides information about the serial number and validity period of an X509 certificate. It explains that the serial number is a unique identifier assigned by the issuer, with valid numbers ranging from 1 to 2147483647. The validity period is the number of days the certificate is valid from the time of issuance, with a maximum validity of 20 years for certificates issued by the Certification Guide.
documents/EFTA00289897.pdf
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