GPG Decryption fails for files > 1MB

david.vazquez_landa at david.vazquez_landa at
Fri Apr 13 17:11:06 CEST 2012

Hello Werner, 

The files sent to us are already encoded using --armor. Funnily enough, only files larger than 1MB fail. Anything smaller can be decrypted without problems. 

Anyway, thanks for the hint.

Best Regards,

David Vázquez
Tel. (+49) 69 1344 7029
Mail. david.vazquez-landa at

> -----Original Message-----
> From: Werner Koch [mailto:wk at]
> Sent: Friday 13 April 2012 16:28
> To: Vazquez Landa, David
> Cc: gnupg-users at
> Subject: Re: GPG Decryption fails for files > 1MB
> On Thu, 12 Apr 2012 10:49, david.vazquez_landa at said:
> > We have an issue with one of our users. When he sends encrypted
> messages larger than ~1 MB, we get these errors:
> > gpg: [don't know]: invalid packet (ctb=0d)
> >
> > gpg: [don't know]: invalid packet (ctb=0a)
> This might indicate a problem in your file transfer - make sure data is
> not modified; i.e. the channel is 8 bit clean).  As a quick test you may
> add the option --armor to the encryption command - this makes the
> message larger but it will be plain ASCII.
> > $ /cygdrive/d/GNU/GnuPG/gpg.exe --version
> >
> > gpg (GnuPG) 1.4.8
> I don't know whether you use a version of GPG build for Cygwin - I
> suggest to use a native Windows version of GnuPG - and well; update to
> a more recent version <
> 1.4.12.exe>
> > Is this a gnupg bug?
> I doubt that.  If you need support, you may want to checkout the service
> directory at
> Salam-Shalom,
>    Werner
> --
> Die Gedanken sind frei.  Ausnahmen regelt ein Bundesgesetz.

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