Public Key Infrastructure (PKI) is a framework that manages digital keys and certificates to facilitate secure communication and transactions. It relies on a pair of keys: a public key, which can be shared with anyone, and a private key, which is kept secret by the owner.In the context of user identity, the public key is tied to a digital certificate issued by a trusted authority. This certificate verifies the owner’s identity and ensures that the public key belongs to them. When someone wishes to send a secure transaction, they encrypt it using the recipient’s public key. Only the recipient can decrypt this using their private key.PKI enhances security by enabling features like encryption, digital signatures, and authentication. This ensures that transactions are safe from tampering and that the identities of the participants are verified. Overall, PKI helps maintain trust and integrity in a system where users need to exchange sensitive information or assets without relying on a central authority.