Will there be a conflict using S/MIME alongside OpenPGP?

pedzsan's Avatar


06 Jan, 2020 06:17 PM

Which of our tools is giving you problems?

While waiting for the Catalina version to come out, a friend and I explored and found how to use S/MIME certificates which has the advantage that you can teach it to iOS devices. As a result, I have not installed the latest GPG Tools. I have the GPG Keychain installed but not the email piece.

Now, a friend has emailed me with an email encrypted with my old GPG (PGP) key so I'm wondering if I can install the email piece of GPG Tools and be able to keep the capabilities I have using S/MIME certificates (encrypt, sign, decrypt, and verify signatures) along with using GPG.

Thank you for your help,

  1. Support Staff 1 Posted by Steve on 06 Jan, 2020 07:53 PM

    Steve's Avatar

    Hi Perry,

    thanks for asking about using S/MIME and OpenPGP side by side.

    This security stackexchange thread covers the questions how OpenPGP and S/MIME differ:

    Please keep in mind that S/MIME does not have any MDC (Modification Detection Code) and is thus still vulnerable to Efail.

    You can simply use the top right indicator to switch between S/MIME and OpenPGP. Make sure to use the nightly build as that includes a fix which is not yet included in 2019.2 and concerns the indicator.

    All the best,

  2. 2 Posted by pedzsan on 13 Jan, 2020 02:28 PM

    pedzsan's Avatar

    Hi Steve,

    Just now got around to trying GPG and it is working fine.

    The links you provided gave me and my friend a couple days of fun. He is an ex-crypto driver writer for AIX (IBM's version of Unix).

    Good luck and take care

  3. Support Staff 3 Posted by Steve on 13 Jan, 2020 03:52 PM

    Steve's Avatar

    Hehe, glad you enjoyed the reading :)

    I'm closing this discussion. Should you need further assistance or have questions you can re-open this discussion here or open a new one any time.


  4. Steve closed this discussion on 13 Jan, 2020 03:52 PM.

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