What information does a certificate contain?

Question

What will be an ideal response?

Answer 1

A certificate typically contains the following information:
* Version: The version of the certificate.
* Serial number: The unique ID of this certificate for this issuer.
* Issuer: The name of the signer of the certificate. In this case, it is "Cmd Demo RA."
* Subject: The name of the holder of the certificate. In this case, it is "Carmen Leung."
* Subject public key information: The public key associated with the subject. In this case, we can see that an RSA public key is used with modulus and exponent values.
* Validity: The time period for which this certificate is valid.
* Signature: The signature created by the CA using its own private key to sign.
* Various optional extensions: X.509 version 3 provides a means to include arbitrary series of extension in a certificate. Extensions may be private or standard. Private extensions are creator-defined values inserted during certificate creation, and standard extensions are commonly used attributes, defined in X.509, such as extendedKeyUsage, possible uses for this key by object identifier, key-Usage , the bitmask of acceptable uses of this key, and subjectAltName, an alternative name for this user.