GnuPG 1.4.20 released

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GnuPG 1.4.20 released

Werner Koch

We are pleased to announce the availability of a new GnuPG classic
release: Version 1.4.20.  This release finally rejects all MD5 based
signatures; see below for details.

What is GnuPG

The GNU Privacy Guard (GnuPG) is a complete and free implementation of
the OpenPGP standard as defined by RFC-4880 and better known as PGP.

GnuPG, also known as GPG, allows to encrypt and sign data and
communication, features a versatile key management system as well as
access modules for public key directories.  GnuPG itself is a command
line tool with features for easy integration with other applications.
A wealth of frontend applications and libraries making use of GnuPG
are available.

GnuPG is Free Software (meaning that it respects your freedom). It can
be freely used, modified and distributed under the terms of the GNU
General Public License.

Three different versions of GnuPG are actively maintained:

- GnuPG "modern" (2.1) is the latest development with a lot of new

- GnuPG "stable" (2.0) is the current stable version for general use.
  This is what most users are currently using.

- GnuPG "classic" (1.4) is the old standalone version which is most
  suitable for older platforms or if there is a need to handle PGP-2
  messages.  This announcement is about a release of this version.

You may not install "modern" (2.1) and "stable" (2.0) at the same
time.  However, it is possible to install "classic" (1.4) along with
any of the other versions.

What's New in GnuPG 1.4.20

 * Reject signatures made using the MD5 hash algorithm unless the
   new option --allow-weak-digest-algos or --pgp2 are given.

 * New option --weak-digest to specify hash algorithms which
   should be considered weak.

 * Changed default cipher for symmetric-only encryption to AES-128.

 * Fix for DoS when importing certain garbled secret keys.

 * Improved error reporting for secret subkey w/o corresponding public

 * Improved error reporting in decryption due to wrong algorithm.

 * Fix cluttering of stdout with trustdb info in double verbose mode.

 * Pass a DBUS envvar to gpg-agent for use by gnome-keyring.

Getting the Software

Please follow the instructions found at https://gnupg.org/download/ or
read on:

GnuPG 1.4.20 may be downloaded from one of the GnuPG mirror sites or
direct from its primary FTP server.  The list of mirrors can be found
at https://gnupg.org/mirrors.html .  Note that GnuPG is not available
at ftp.gnu.org.

On ftp.gnupg.org you find these files:

 ftp://ftp.gnupg.org/gcrypt/gnupg/gnupg-1.4.20.tar.bz2  (3606k)

This is the GnuPG 1.4.20 source code compressed using BZIP2 and its
OpenPGP signature.

 ftp://ftp.gnupg.org/gcrypt/gnupg/gnupg-1.4.20.tar.gz  (5036k)

This is the same GnuPG 1.4.20 source code compressed using GZIP and its
OpenPGP signature.

 ftp://ftp.gnupg.org/gcrypt/binary/gnupg-w32cli-1.4.20.exe (2359k)

This is GnuPG 1.4.20 compiled for Microsoft Windows and its OpenPGP
signature.  This is a command line only version; the source files are
the same as above.  Note, that this is a minimal installer and unless
you are only in need for the simple the gpg binary, you are better off
using the full featured installer at https://www.gpg4win.org .

To download the files via https use these URLs:


Checking the Integrity

In order to check that the version of GnuPG which you are going to
install is an original and unmodified one, you can do it in one of
the following ways:

 * If you already have a version of GnuPG installed, you can simply
   verify the supplied signature.  For example to verify the signature
   of the file gnupg-1.4.20.tar.bz2 you would use this command:

     gpg --verify gnupg-1.4.20.tar.bz2.sig gnupg-1.4.20.tar.bz2

   This checks whether the signature file matches the source file.
   You should see a message indicating that the signature is good and
   made by one or more of the release signing keys.  Make sure that
   this is a valid key, either by matching the shown fingerprint
   against a trustworthy list of valid release signing keys or by
   checking that the key has been signed by trustworthy other keys.
   See below for information on the signing keys.

 * If you are not able to use an existing version of GnuPG, you have
   to verify the SHA-1 checksum.  On Unix systems the command to do
   this is either "sha1sum" or "shasum".  Assuming you downloaded the
   file gnupg-1.4.20.tar.bz2, you would run the command like this:

     sha1sum gnupg-1.4.20.tar.bz2

   and check that the output matches the first line from the
   following list:

cbc9d960e3d8488c32675019a79fbfbf8680387e  gnupg-1.4.20.tar.bz2
359e464bcabbe370696e3dba45a1d63968c06ab3  gnupg-1.4.20.tar.gz
8f0c4760c9f38102f64a156744ec8a428298b92d  gnupg-w32cli-1.4.20.exe

Release Signing Keys

To guarantee that a downloaded GnuPG version has not been tampered by
malicious entities we provide signature files for all tarballs and
binary versions.  The keys are also signed by the long term keys of
their respective owners.  Current releases are signed by one or more
of these four keys:

  2048R/4F25E3B6 2011-01-12 [expires: 2019-12-31]
  Key fingerprint = D869 2123 C406 5DEA 5E0F  3AB5 249B 39D2 4F25 E3B6
  Werner Koch (dist sig)

  rsa2048/E0856959 2014-10-29 [expires: 2019-12-31]
  Key fingerprint = 46CC 7308 65BB 5C78 EBAB  ADCF 0437 6F3E E085 6959
  David Shaw (GnuPG Release Signing Key) <dshaw 'at' jabberwocky.com>

  rsa2048/33BD3F06 2014-10-29 [expires: 2016-10-28]
  Key fingerprint = 031E C253 6E58 0D8E A286  A9F2 2071 B08A 33BD 3F06
  NIIBE Yutaka (GnuPG Release Key) <gniibe 'at' fsij.org>

  rsa2048/7EFD60D9 2014-10-19 [expires: 2020-12-31]
  Key fingerprint = D238 EA65 D64C 67ED 4C30  73F2 8A86 1B1C 7EFD 60D9
  Werner Koch (Release Signing Key)

You may retrieve these files from the keyservers using this command

  gpg --recv-keys 249B39D24F25E3B6 04376F3EE0856959 \
                  2071B08A33BD3F06 8A861B1C7EFD60D9

The keys are also available at https://gnupg.org/signature_key.html .
Note that this mail has been signed using my standard PGP key.


Please consult the archive of the gnupg-users mailing list before
reporting a bug <https://gnupg.org/documentation/mailing-lists.html>.
We suggest to send bug reports for a new release to this list in favor
of filing a bug at <https://bugs.gnupg.org>.  For commercial support
requests we keep a list of known service companies at:


If you are a developer and you need a certain feature for your project,
please do not hesitate to bring it to the gnupg-devel mailing list for

Maintenance and development of GnuPG is mostly financed by donations.
As of today we employ 3 full-time developers, one part-timer, and one
contractor.  They all work on GnuPG and closely related software like
Enigmail.  Please see


on how you can help.


We have to thank all the people who helped with this release, be it
testing, coding, translating, suggesting, auditing, administering the
servers, spreading the word, answering questions on the mailing
lists, and donating money.

For the GnuPG hackers,


This is an announcement only mailing list.  Please send replies only to
the gnupg-users at gnupg.org mailing list.

Die Gedanken sind frei.  Ausnahmen regelt ein Bundesgesetz.

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