Identity-based Key Infrastructures (IKI)

Kohnfelder realized in 1978 that public key schemes require a Public Key Infrastructure (PKI) . X500/X509 were set up to standardize these ideas. PGP, proposed by Zimmermann is an alternative to the original PKI idea. Variants of the PGP based PKI were discussed independently by Reiter-Stubblebine and Burmester-Desmedt-Kabatianskii.