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Could you find the sender's Public PGP (GPG) key from an encoded message?

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Did you mean "Encoded" or "Encrypted"? –  grawity Apr 16 '11 at 14:32
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Encrypted messages only contain the recipients' key IDs (and even that can be disabled).

You can only find the sender's key ID if the message was also signed – but the signature is encrypted too, so you're out of luck.

Either way, you would only find the key ID, not the key itself.

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