GPG Services: how to create binary signatures

stefanomarty's Avatar


24 Nov, 2019 03:11 PM

Which of our tools is giving you problems?

GPG Service

Attach a screenshot of the version info for all installed components (how to:

I just updated to GPG_Suite-2019.2

Describe your problem. Add as much detail as possible.

The standard output for GPG Services signatures is ASCII Armor. According to this article:
the default can be switched off and set back to binary. I tried the suggested commands, but I still get ASCII armor signatures.

What did you expect instead

I expected a signature in binary form.

Describe steps leading to the problem.

  1. Modify the standard output with this command in terminal:

    defaults write ~/Library/Preferences/org.gpgtools.gpgservices UseASCIIOutput -bool NO
  2. Verify the parameter is changed:

    defaults read ~/Library/Preferences/org.gpgtools.gpgservices UseASCIIOutput
    0  <-- OK
  3. Sign a random file in Finder
    Select the key
    Insert passphrase

  4. Check the signature file
    I expected a binary file.txt.sig file, but I still get an ASCII armor file, even with the parameter set to zero.

Are you using any other plugins?


  1. Support Staff 1 Posted by Mento on 13 Dec, 2019 10:16 AM

    Mento's Avatar


    the UseASCIIOutput option only affects file encryption, not signatures.
    By defaults GPG Services uses the binary mode, when it encrypts a file. By setting UseASCIIOutput to YES, the encrypted file are stored using ASCII armor.

    There is currently no option to tell GPGServices to create detached binary signatures.

    Regards, Mento

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