The document provides definitions and explanations related to X509 certificate serial numbers and validity periods. It explains that a serial number is a unique identifier assigned by the certificate issuer, and it should be between 1 and 2147483647. The validity period is the number of days the certificate remains valid from its issuance date, with a maximum of 20 years for certificates issued via the Certificate Assistant.
documents/EFTA00289915.pdf
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