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OpenPGP digital signature unverified

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Richard
Richard
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I have an external PGP key on a Yubikey that has three identities (e-mail addresses) on it.

I can send an e-mail from one of these identities to another. If I encrypt the e-mail the other mailbox will be able to decrypt it and verify the signature (of course). If I only sign the e-mail, however, the other mailbox will complain, "Invalid Digital Signature". The 'sent' folder of the sender will show the e-mail as correctly signed even when it was only signed and not encrypted.

Any ideas what is going wrong here would be gratefully received.

I have an external PGP key on a Yubikey that has three identities (e-mail addresses) on it. I can send an e-mail from one of these identities to another. If I encrypt the e-mail the other mailbox will be able to decrypt it and verify the signature (of course). If I only sign the e-mail, however, the other mailbox will complain, "Invalid Digital Signature". The 'sent' folder of the sender will show the e-mail as correctly signed even when it was only signed and not encrypted. Any ideas what is going wrong here would be gratefully received.

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Richard
Richard Deținătorul întrebării
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To add to this confusion, it is only one of the three identities that appears to have the problem. The other two can send digitally signed e-mails that will be verified by all three identities.