Public-Key Cryptography (PKC)

    Public-key cryptography (PKC) is a cryptographic system that uses alphanumeric keys that work in pairs: public keys, which can be distributed to others, and private keys, which cannot be distributed to others. PKI is a set of policies, procedures, and hardware-software combinations required to authenticate users and devices online. In practice, one or more trusted parties digitally sign a digital document or decentralized ledger to confirm that a particular cryptographic key belongs to a particular user or device. PKIs are essential for creating, managing, distributing, using, and storing digital certificates, as well as managing public-key encryption.