The document provides definitions for 'serial number' and 'validity period' in the context of X509 certificates. It explains that the serial number is a unique identifier assigned by the issuer to distinguish the certificate from others, with a valid range from 1 to 2147483647. The validity period refers to the number of days the certificate is valid from the date of issuance, with a maximum duration of 20 years for certificates issued by the 'Certificate Assistant'.
documents/EFTA00289927.pdf
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