I am looking for a public key system that allows for a 3rd party to use that key for other purposes.

What private key systems allow for this? PGP, S/MIME, PKI?

  • You mean like certificate's key usage, which are usually set by the CA and define how the certificate owner can use his certificate? – WhiteWinterWolf Jul 8 '16 at 13:47
  • That key specifically, or another key? Because PGP allows vouching for other keys. – Diti Jul 8 '16 at 13:49
  • I'm looking for any system that allows for this, I'm trying to determine which ones to research further. – halfbit Jul 8 '16 at 15:50
  • what is a private key system? you mention a few public key concepts... – dandavis Jul 8 '16 at 18:56
  • "For other purposes" is very broad. What exactly are your requirements? – Jens Erat Jul 9 '16 at 10:07

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