A Certificate Authority (CA) is a trusted entity that issues and signs digital certificates binding identities to public keys. It matters because certificate-based trust is only as strong as the authority allowed to vouch for those identities.
What is Certificate Authority (CA)?
A CA verifies some level of identity or control before signing certificates. Browsers, operating systems, and enterprises rely on trusted CA relationships to decide whether to accept certificates for websites, applications, users, or devices.
What Certificate Authority (CA) Commonly Supports
Common uses include TLS issuance, device certificates, enterprise internal trust, code signing certificates, and identity-backed public key validation.
Certificate Authority (CA) vs. Self-Signed Certificate
A CA-signed certificate chains to a recognized trust anchor. A self-signed certificate relies on direct manual trust instead.
Frequently Asked Questions
Why does a CA matter?
Because a signed certificate has little value if the signer is not trusted by the relying system.
Can organizations run their own CA?
Yes. Many enterprises use internal CAs for devices, users, and private services.
