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, ∼6056🔥, 0💬

OpenSSL "verify -CAfile" - Specify Root CA Certificate
How to specify the root CA certificates that close the signing chain for the server certificate for OpenSSl "verify" command? I have downloaded the root CA certificate in a file. If you have the root CA certificate downloaded in a file, you can provide it to the OpenSSL "verify" command using the "-... 2012-07-24, ≈13🔥, 0💬

Download Root CA Certificate
How to download the certificate from a root CA? I need to the root CA certificate to close the certification validation chain. If you know the CN (Common Name) of the root CA, for example "DigiCert High Assurance EV Root CA", you can search and download it our certificate database at certificate.fyi... 2012-07-24, ≈12🔥, 0💬

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, ≈11🔥, 0💬

What Is JKS (Java KeyStore) File
What is a JKS (Java KeyStore) file? I heard that it used to provide CA certificates to Java applications. A Java Keystore file is a specially formatted file used to store cryptographic keys and certificates. A Java KeyStore file can be used to store 3 types of entries: 1. PrivateKeyEntry - This type... 2012-07-24, ∼8289🔥, 0💬

What Are Certificate File Name Extensions
What are file name extensions used for certificates? I see .cer files on my Windows computer. Most commonly used file name extensions for X.509 certificates are: .cer - Used for certificate files in binary DER format. Could also be used for certificate files in text PEM format. .crt - Used for certi... 2012-07-25, ∼6926🔥, 0💬

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, ∼6359🔥, 0💬

What Is the Structure of Certificates
What is the structure of certificates? What types of values are recorded in a certificate? 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: ... 2012-07-24, ∼6057🔥, 0💬

What Are Distinguished Names
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, ∼5972🔥, 0💬

What Is PKI (Public-Key Infrastructure)
What is PKI (Public-Key Infrastructure)? Public-Key Infrastructure (PKI) is a public-key cryptography system that enables users to securely communicate on an insecure public network, and reliably verify the identity of a user via digital signatures. The main function of the a PKI system is for the c... 2012-07-25, ∼5344🔥, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.