PKI – Public Key Infrastructure is a framework used to manage digital keys and certificates that ensure secure communication over the internet. It enables encryption, authentication, and digital signatures to protect sensitive data and verify the identity of users or systems.
Here’s a simple breakdown:
- Public and Private Keys: PKI uses two types of cryptographic keys. The public key is shared with others to encrypt data, while the private key is kept secret and used to decrypt it. Only the holder of the private key can decrypt the data encrypted with the public key.
- Digital Certificates: These are used to verify the identity of users, websites, or devices. A digital certificate contains a public key and is issued by a trusted authority, known as a Certificate Authority (CA).
- Certificate Authority (CA): This is a trusted organisation that issues digital certificates, ensuring that the public key belongs to the rightful owner. It acts as a third-party verifier in the PKI system.
Why Use PKI? PKI secures online communication by ensuring that only authorised parties can access sensitive data. It also helps verify the identity of users and organisations, preventing fraud and data breaches.
Think of PKI like a digital ID card system, where each user or system has a unique pair of keys—one to lock the information (public key) and the other to unlock it (private key)—all verified by a trusted authority to ensure secure and private exchanges.
