Public Key Infrastructure (PKI) is a framework that enables secure communication and authentication through the use of cryptographic key pairs, consisting of a public key and a private key. It provides the necessary components, policies, and procedures to manage digital certificates and public-key encryption, ensuring that users can exchange information securely while maintaining their identities. PKI plays a crucial role in the development of self-sovereign identity systems on blockchain, allowing individuals to control their own digital identities without relying on central authorities.
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