Public Key Infrastructure. July 2011. Topics. The need of PKI Trust Model PKI Structures CA types PGP. Public Key Distribution issue. Public Key cryptography solves the problem of Confidentiality, Integrity Authenticity Non-repudiation But how to ensure the public key is not faked?
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CWeb of Trust model
Public key is submitted to CA for certification
User generatesa key pair
Certificate is sent to the user
User request a certificate to CA
CA generatesa key pair
Private Key and Certificate are sent to the user
– Easy to build
– Easy to maintain
– All users trust this CA
– Paths have one certificate and one CRL
– Doesn’t scale particularly well