Decryption failed with unknown error!

Frédéric Miserey's Avatar

Frédéric Miserey

03 Jun, 2015 03:50 PM

Which of our tools is giving you problems?


Paste version info of your installed software: (how to:

Mac OS X 10.10.3 (14D136)
Libmacgpg 0.5 711n (f7e29b1)
GPGMail 2.5b6 1004n (7a57a95)
GPG Keychain 1.2b6 1080n (7a5d851)
GPGServices 1.10b6 826n (2335a7b)
MacGPG2 2.0.27b6 831n (fbdcc85)
GPGPreferences 1.5b6 814n (69f63db)

Describe your problem. Add as much detail as possible.

I received an email from a new recipient (using Outlook 2013 and GGP4Win) and Mail won't decrypt it. Error message is

An unknown error occurred while decrypting this message.
GPG error message:
gpg: invalid radix64 character 3A skipped
gpg: CRC error; 2B67D0 - 8DDCE8
gpg: [don't know]: invalid packet (ctb=55)
Please contact us, including the GPG error message, at

What did you expect instead

Message decryption!

Describe steps leading to the problem.

You'll notice blank lines in the screenshot. If I open this message with Airmail 2 for exemple, there are none.

I get the same error if I copy the message with blank lines to cyper.gpg and use the cmd line tool. I don't get an error when I do the same thing with the more "compact" message.

Now, if I open the message as raw in Airmail, it has the blank lines but they are gone in "normal view". I created an eml file to be able to inspect the characters and everyline ends with \n\n, therefore the blank lines.

I haven't checked the specs to see whether you "should" ignore multiple \n or if that's a GPG4Win bug ;)

Hope this helps.

If your problem concerns GPGMail, are other plugins installed in


  1. Support Staff 1 Posted by Steve on 17 Jul, 2015 05:35 PM

    Steve's Avatar

    Hi Frédéric,

    thanks for the report. Could you please download and install our latest nightly build and see if the problem persists. That page also has sig and SHA1 to verify the download.

    All the best, steve

    Disclaimer: This is a development version which has not been thoroughly tested yet - bugs or crashes are to be expected. Thanks for helping us test.

  2. 2 Posted by frederic on 17 Jul, 2015 05:43 PM

    frederic's Avatar

    Like a charm ! Thank you.
    On 17 juillet 2015 at 19:36:02, Steve ([email blocked]) wrote:

  3. Support Staff 3 Posted by Steve on 17 Jul, 2015 05:45 PM

    Steve's Avatar

    Perfect. Glad, this is solved for you. I'm closing this discussion. If you need further assistance or have questions you can re-open this discussion here or open a new one any time.

    Best, steve

  4. Steve closed this discussion on 17 Jul, 2015 05:45 PM.

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