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

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Download Root CA Certificate
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OpenSSL "verify" - Verify or Validate Certificate
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, 9908👍, 0💬

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Example of X.509 Certificate Data Structure
Can you show me an example of X.509 certificate data structure? Here is an example of X.509 Version 3 certificate data structure: Certificate: Data: Version: 3 (0x2) Serial Number: 1 (0x1) Signature Algorithm: md5WithRSAEncryption Issuer: C=ZA, ST=Western Cape, L=Cape Town, O=Thawte Consulting cc, O... 2012-07-24, 5209👍, 0💬

What Is the Structure of Certificates
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What are distinguished names on certificates? I see "CN=..." on in many certificates. Distinguished Names are used in X.509 certificates to identify entities, such as those used in the subject and issuer (signer) fields. The X.509 standard defines the following fields for Distinguished Names: CN - C... 2012-07-25, 4640👍, 0💬

What Is PKI (Public-Key Infrastructure)
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