The document provides definitions and explanations for X509 certificate serial numbers and validity periods. It explains that a serial number is assigned by the issuer to distinguish between certificates and must be within the range of 1 to 2147483647. The validity period is the number of days a certificate is valid from issuance, with a maximum validity of 20 years for certificates issued by the certificate authority guide.
documents/EFTA00289906.pdf
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