Is it possible to add a passphrase to a secret key originally created without one? If so, please tell me how. I'll be happy with either instructions or pointer to the fine manual I either missed or misread.

I have tried lots of variations. Attempts using gpg-agent fail because pinentry (I've tried text and gui versions) refuses to accept a blank passphrase. Variants using --passphrase or --passphrase-fd don't work because they only allow passing one passphrase, and I need to provide the old one and the new one. I've also tried --export-secret-key, which also fails with "error receiving key from agent: No passphrase given - skipped" when using --passphrase-fd.

I do have a copy of gpg-1.4.23 available, but simply copying .gnupg to a new user and using the old gpg doesn't help because gpg1 doesn't see the secret keys from gpg2, and I haven't been able to export them.

Is there a way to do this, or is revoking the old key and creating new keys from scratch the only solution?

Thanks for any information.

Jack

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