Certification authority

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

A certificate authority is a trusted entity that issues and verifies digital certificates.

A certification authority (CA) is a trusted organization that issues and verifies digital certificates. Websites use certificates to prove their identity and distinguish legitimate sites from imitations. section 11.3.3

A CA supports secure website connections by:

• Enabling browsers to check a website certificate against a trusted CA. section 11.3.3
• Supporting HTTPS, the encrypted version of HTTP, after certificate checks succeed. section 11.3.3
• Prompting a warning when certificate verification fails or potential risks are detected. section 11.3.3

Figure 11.6 Digital certificates are used to verify the authenticity of websites. In Chrome, a padlock next to the URL indicates a secure connection via HTTPS. Clicking on it shows more details, such as information about the certificate.

Use the browser padlock to inspect a website’s secure HTTPS connection and certificate details. section 11.3.3

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes

Defines certificate issuance, verification, browser checking, and warning behavior without detailing certificate-management internals.

Examples

Uses Chrome’s padlock indicator and certificate details as the concrete verification example.

What you can do after

Evaluate website identity through browser certificate indicators and recognize warnings when verification fails.

How it connects

Connects digital certificates with website authentication, browsers, HTTPS, and encrypted communications.

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Also explained in

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  Real-World CryptographyA certificate authority is an entity that issues and digitally signs certificates binding public keys to identities or domains.
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  Software Security for DevelopersA local certificate authority is a privately operated certificate authority that issues certificates within an organization's or development environment's trust boundary.
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  ASP.NET Core in Action, 3eA certificate authority is a trusted entity that issues or signs digital certificates to attest to the identity of certificate holders.
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  Learn PowerShell Scripting in a Month of Lunches, Second Edition: Write and organize scripts and toolsA certificate authority is a trusted entity that issues and signs digital certificates after validating certificate requests.
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  Logs and TelemetryA certificate authority is a trusted entity that issues and validates digital certificates and maintains their revocation records.
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  Build Python Web Apps with StreamlitA certificate authority is a trusted entity that validates identities and digitally signs certificates for them.
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  Google Anthos in ActionA certificate authority is a trusted entity that issues and signs digital certificates.

Compare how 8 books explain certification authority →

Related concepts

• certificateproduces · A digital certificate is a digitally signed credential that binds an identity to a public key and supports authentication or secure communication.
• public-key infrastructureused by · Public-key infrastructure is a framework of authorities, certificates, keys, policies, and procedures for establishing and managing public-key trust and digital identities.
• domain ownershipuses · Domain ownership is the assignment of responsibility for a business domain’s data, including its meaning, structure, quality, documentation, and governance, to the domain that produces it.
• root certificateincludes · A root certificate is a trusted certificate, typically self-signed, that serves as a trust anchor for validating a certificate chain and authorizing subordinate certificates.
• intermediate certificateincludes · An intermediate certificate is a certificate issued by a root or higher-level certificate authority to establish a trust chain for end-entity certificates.

This explainer was generated by Manning's knowledge graph from the text of Acing the CCNA Exam: Volume 2 Advanced Networking and Security. The section links point to the parts of the book it draws on.