What Is the Structure of Certificates

Q

What is the structure of certificates? What types of values are recorded in a certificate?

✍: FYIcenter.com

A

The structure of an X.509 Version 3 certificate is defined in RFC 5280 - "Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile". It contains the following values:

Certificate
    Version
    Serial Number
    Algorithm ID
    Issuer
    Validity
        Not Before
        Not After
    Subject
    Subject Public Key Info
        Public Key Algorithm
        Subject Public Key
    Issuer Unique Identifier (optional)
    Subject Unique Identifier (optional)
    Extensions (optional)
        ...
Certificate Signature Algorithm
Certificate Signature

⇒ Example of X.509 Certificate Data Structure

⇐ What Is the Digital Signature on a Certificate

⇑ Terminologies on Basic Concepts

⇑⇑ "What Is" - Certificate Related Terminologies

2012-07-24, ∼5906🔥, 0💬

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Download Root CA Certificate
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How to verify or validate a certificate using OpenSSL "verify" command? I got a certificate from the Web site server and want to see if it is valid. If you have a certificate stored in a file, you can try to validate it or verify it with the OpenSSL "verify" command as shown below: C:\Users\fyicente... 2012-07-24, ≈10🔥, 0💬

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Example of X.509 Certificate Data Structure
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