On 29/08/17 15:24, Shawn K. Quinn wrote: > All you're supposed to be > able to tell when using that option, is that none of your keys will > decrypt the message
... which you can only do by trying each private key on the encrypted session key packet and seeing whether the resulting plaintext (which contains the session key) makes sense. There isn't any information that can be learned without actually trying out a particular private key. At least for RSA, it's the only algorithm I know enough by heart about to make this claim with confidence. You don't need to decrypt the data though, just the encrypted session key, to see if it's the correct private key. HTH, Peter. -- I use the GNU Privacy Guard (GnuPG) in combination with Enigmail. You can send me encrypted mail if you want some privacy. My key is available at <http://digitalbrains.com/2012/openpgp-key-peter>
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