A public key infrastructure (PKI) is a system for managing cryptographic public keys. A PKI system includes hardware, software, policies and roles, such as a certificate authority, for creating, managing distributing, storing and revoking public key certificates. A public key infrastructure that is built on a distributed ledger is called a decentralized public key infrastructure (DPKI) and forms a component of an identity trust fabric. 

New : 2020 Guidance for Decentralized Identity and Verifiable Claims

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