Characteristics of Digital Certificates

Last Updated on Tue, 03 Oct 2023 | Security Policy

PKI provides a hierarchical framework for managing the digital security attributes. Each PKI participant holds a digital certificate that has been issued by a CA. The certificate contains a number of attributes that are used when parties negotiate a secure connection. These attributes must include the certificate validity period, end-host identity information, encryption keys that will be used for secure communications, and the signature of the issuing CA. Optional attributes may be included, depending on the requirements and capability of the PKI.

A CA can be a trusted third party, such as VeriSign or Entrust, or a private (in-house) CA that you establish within your organization.

Digital signatures, enabled by public key cryptography, provide a means to digitally authenticate devices and individual users. In public key cryptography, such as the RSA encryption system, each user has a key-pair containing both a public key and a private key. The keys act as complements, and anything encrypted with one of the keys can be decrypted with the other. In simple terms, a signature is formed when data is encrypted with a user's private key. The receiver verifies the signature by decrypting the message with the sender's public key.

The fact that the message could be decrypted using the sender's public key means that the holder of the private key created the message. This process relies on the receiver having a copy of the sender's public key and knowing with a high degree of certainty that it really does belong to the sender and not to someone pretending to be the sender.

To validate the CA's signature, the receiver must know the CA's public key. Normally, this is handled out-of-band or through an operation performed during installation of the certificate. For instance, most web browsers are configured with the root certificates of several CAs by default.

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Readers' Questions

  • RACHAEL
    Why were millions of digital certificates revoked?
    18 days ago
    • There are several reasons why millions of digital certificates may have been revoked:
    1. Security Breach: If a certificate authority (CA) is compromised or there is a security breach, they may be forced to revoke all digital certificates issued during a specific period to prevent unauthorized access or fraudulent activities.
    2. Expired Certificates: Digital certificates have an expiration date, typically lasting for a few years. Once a certificate expires, it is no longer considered valid and must be revoked.
    3. Key Compromise: If the private key associated with a digital certificate is compromised or stolen, it poses a security risk. To mitigate this risk, the certificate authority will revoke the corresponding digital certificate.
    4. Suspected Fraud or Misuse: If there is suspicion of fraudulent activity or misuse of a digital certificate, the certificate authority may revoke it to prevent further damage or unauthorized actions.
    5. Changes in Certificate Authority Policies: If a certificate authority modifies its policies or practices, existing certificates may be revoked to align with the new policies or to maintain consistent standards.It is important to note that the revocation of digital certificates is a mechanism to ensure the integrity and security of cryptographic systems and protect against unauthorized access or fraudulent activities.
    • vanna
      What is digital certificate in cryptography?
      6 months ago
      • A digital certificate is an electronic document used to verify the identity of a person or business and to provide secure access to services on the internet. It contains information about the identity of the certificate holder, including their name, public key, and other details. It is signed by a Certificate Authority (CA), which verifies the identity of the certificate holder and ensures that the certificate is valid. Digital certificates are commonly used in online transactions, including online banking, online shopping, and online communication.
      • tina
        What are the attribute of a digital certificate?
        1 year ago
        1. Validity period: The length of time that the digital certificate is valid for.
        2. Serial number: Uniquely identifies the digital certificate.
        3. Subject: The entity that is identified by the digital certificate.
        4. Issuer: The entity that signed and issued the digital certificate.
        5. Signature algorithm: Used to generate the digital signature.
        6. Public key: Used to encrypt and decrypt messages.
        7. Revocation list: List of digital certificates that have been revoked.
        8. Extensions: Optional attributes that can be included in the digital certificate.