What information does a certificate contain??
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?All X.509 certificates contain the following pieces of information:
* Version-Identifies the version of the X.509 standard that applies to this certificate
* Serial number-A unique value that identifies a particular certificate; when a certificate is revoked, its serial number is placed in a certificate revocation list (CRL)
* Signature algorithm identifier-Identifies the algorithm used by the certificate authority (an entity that will be defined shortly) to sign the certificate
* Issuer name-The name of the entity, normally a certificate authority, that signed the certificate (in some instances, the issuer signs his or her own name)
* Validity period-The limited amount of time for which each certificate is valid (a period that can be as short as a few seconds or as long as a century), denoted by a start date and time and an end date and time
* Subject name-The name of the entity whose public key this certificate identifies
* Subject public key information-The public key of the entity being named, together with an algorithm identifier that specifies to which public key encryption system this key belongs
* Digital signature-The signature of the certificate authority that will be used to verify a legitimate certificate
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