Certificate Authority (CA)

A Certificate Authority (CA) is a trusted third-party organization responsible for issuing, verifying, revoking, and managing digital certificates within a Public Key Infrastructure (PKI). Its core function is to authenticate the identity of entities—such as websites, servers, organizations, and individuals—by cryptographically binding their verified identity to a public key. This process enables secure communication protocols like SSL/TLS, ensuring that data exchanged over public networks remains confidential and intact.

By digitally signing each certificate, a CA guarantees to relying parties that the presented identity is legitimate, thereby mitigating risks such as impersonation, phishing, and man-in-the-middle attacks. CAs form the foundation of the internet's chain of trust, serving as a critical security control that underpins encrypted data exchange, secure access management, and digital signatures. Organizations and users worldwide depend on Certificate Authorities to uphold the integrity and trustworthiness of their online operations, making them indispensable to a resilient and secure digital ecosystem.