Aspects


vs


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Openpgp

The OpenPGP standard was originally derived from PGP (Pretty Good Privacy)

X509

In cryptography, X.509 is a standard for a public key infrastructure (PKI) for single sign-on (SSO) and Privilege Management Infrastructure (PMI).



Others

Example

Openpgp is simpler than x509 but more limited especially if you wish to have a strong legal meaning behind the certificates

from question  

Preventing MITM attacks on server

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