Certificate Authority (CA)

    A certificate authority (CA) is a third-party entity that issues certificates and manages the public keys required for online cryptographic verification of digital certificates. CAs, which can be government-based or large multinational corporations, play an important role in securing much of the information exchanged on the internet. To enable the secure exchange of information online, digital certificates are frequently used to encrypt digital transactions and identity data. Users can securely send instant messages and emails using certificates based on the Transport Layer Security (TLS) and Secure Sockets Layer (SSL) protocols.