Public Key Infrastructure (PKI), in relation to cryptology, is a system which makes it possible to issue, distribute and check digital certificates. Public Key Infrastructures consist of protocols, services and standards which support different applications. Each user is assigned a cryptographic key pair in a PKI, which comprises a Public Key and a Private Key. Both keys are mathematically related to each other. The public key is published, the Private Key is kept secret.

A PKI makes it possible to securely exchange digital signatures and encrypted documents and allows for authentication, authorization and other functions, even if several communication partners are involved.

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