The GNU Privacy Guard 2
                      =========================
                             Version 2.1

          Copyright 1997-2017 Werner Koch
          Copyright 1998-2017 Free Software Foundation, Inc.


* INTRODUCTION

  GnuPG is a complete and free implementation of the OpenPGP standard
  as defined by RFC4880 (also known as PGP).  GnuPG enables encryption
  and signing of data and communication, and features a versatile key
  management system as well as access modules for public key
  directories.

  GnuPG, also known as GPG, is a command line tool with features for
  easy integration with other applications.  A wealth of frontend
  applications and libraries are available that make use of GnuPG.
  Starting with version 2 GnuPG provides support for S/MIME and Secure
  Shell in addition to OpenPGP.

  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.

  We are currently maintaining three branches of GnuPG:

  - 2.1 (i.e. this release) is the latest stable version with a lot of
    new features.

  - 2.0 is an often used stable version.  This branch will reach
    end-of-life on 2017-12-31.

  - 1.4 is the old standalone version which is most suitable for older
    or embedded platforms.

  You may not install 2.1 and 2.0 at the same time.  However, it is
  possible to install 1.4 along with any of the 2.x versions.


* BUILD INSTRUCTIONS

  GnuPG 2.1 depends on the following GnuPG related packages:

    npth         (ftp://ftp.gnupg.org/gcrypt/npth/)
    libgpg-error (ftp://ftp.gnupg.org/gcrypt/libgpg-error/)
    libgcrypt    (ftp://ftp.gnupg.org/gcrypt/libgcrypt/)
    libksba      (ftp://ftp.gnupg.org/gcrypt/libksba/)
    libassuan    (ftp://ftp.gnupg.org/gcrypt/libassuan/)

  You should get the latest versions of course, the GnuPG configure
  script complains if a version is not sufficient.

  For some advanced features several other libraries are required.
  The configure script prints diagnostic messages if one of these
  libraries is not available and a feature will not be available..

  You also need the Pinentry package for most functions of GnuPG;
  however it is not a build requirement.  Pinentry is available at
  ftp://ftp.gnupg.org/gcrypt/pinentry/ .

  After building and installing the above packages in the order as
  given above, you may continue with GnuPG installation (you may also
  just try to build GnuPG to see whether your already installed
  versions are sufficient).

  As with all packages, you just have to do

    ./configure
    make
    make install

  (Before doing install you might need to become root.)

  If everything succeeds, you have a working GnuPG with support for
  OpenPGP, S/MIME, ssh-agent, and smartcards.  Note that there is no
  binary gpg but a gpg2 so that this package won't conflict with a
  GnuPG 1.4 installation.  gpg2 behaves just like gpg.

  In case of problem please ask on the [email protected] mailing
  list for advise.

  Instruction on how to build for Windows can be found in the file
  doc/HACKING in the section "How to build an installer for Windows".
  This requires some experience as developer.

  Note that the PKITS tests are always skipped unless you copy the
  PKITS test data file into the tests/pkits directory.  There is no
  need to run these test and some of them may even fail because the
  test scripts are not yet complete.

  You may run

    gpgconf --list-dirs

  to view the default directories used by GnuPG.

  To quickly build all required software without installing it, the
  Speedo method may be used:

    make -f build-aux/speedo.mk  native

  This method downloads all required libraries and does a native build
  of GnuPG to PLAY/inst/.  GNU make is required and you need to set
  LD_LIBRARY_PATH to $(pwd)/PLAY/inst/lib to test the binaries.

** Specific build problems on some machines:

*** Apple OSX 10.x using XCode

  On some versions the correct location of a header file can't be
  detected by configure.  To fix that you should run configure like
  this

    ./configure  gl_cv_absolute_stdint_h=/usr/include/stdint.h

  Add other options as needed.


*** Systems without a full C99 compiler

  If you run into problems with your compiler complaining about dns.c
  you may use

    ./configure --disable-libdns

  Add other options as needed.


* MIGRATION from 1.4 or 2.0 to 2.1

  The major change in 2.1 is gpg-agent taking care of the OpenPGP
  secret keys (those managed by GPG).  The former file "secring.gpg"
  will not be used anymore.  Newly generated keys are stored in the
  agent's key store directory "~/.gnupg/private-keys-v1.d/".  The
  first time gpg needs a secret key it checks whether a "secring.gpg"
  exists and copies them to the new store.  The old secring.gpg is
  kept for use by older versions of gpg.

  Note that gpg-agent now uses a fixed socket.  All tools will start
  the gpg-agent as needed.  The formerly used environment variable
  GPG_AGENT_INFO is ignored by 2.1.  The SSH_AUTH_SOCK environment
  variable should be set to a fixed value.

  The Dirmngr is now part of GnuPG proper and also used to access
  OpenPGP keyservers.  The directory layout of Dirmngr changed to make
  use of the GnuPG directories.  Dirmngr is started by gpg or gpgsm as
  needed. There is no more need to install a separate Dirmngr package.

* RECOMMENDATIONS

** Socket directory

  GnuPG uses Unix domain sockets to connect its components (on Windows
  an emulation of these sockets is used).  Depending on the type of
  the file system, it is sometimes not possible to use the GnuPG home
  directory (i.e. ~/.gnupg) as the location for the sockets.  To solve
  this problem GnuPG prefers the use of a per-user directory below the
  the /run (or /var/run) hierarchy for the the sockets.  It is thus
  suggested to create per-user directories on system or session
  startup.  For example the following snippet can be used in
  /etc/rc.local to create these directories:

      [ ! -d /run/user ] && mkdir /run/user
      awk -F: </etc/passwd '$3 >= 1000 && $3 < 65000 {print $3}' \
        | ( while read uid rest; do
              if [ ! -d "/run/user/$uid" ]; then
                mkdir /run/user/$uid
                chown $uid /run/user/$uid
                chmod 700 /run/user/$uid
              fi
            done )


* DOCUMENTATION

  The complete documentation is in the texinfo manual named
  `gnupg.info'.  Run "info gnupg" to read it.  If you want a a
  printable copy of the manual, change to the "doc" directory and
  enter "make pdf" For a HTML version enter "make html" and point your
  browser to gnupg.html/index.html.  Standard man pages for all
  components are provided as well.  An online version of the manual is
  available at [[https://gnupg.org/documentation/manuals/gnupg/]] .  A
  version of the manual pertaining to the current development snapshot
  is at [[https://gnupg.org/documentation/manuals/gnupg-devel/]] .


* GnuPG 1.4 and GnuPG 2.0

  GnuPG 2.0 is a newer version of GnuPG with additional support for
  S/MIME.  It has a different design philosophy that splits
  functionality up into several modules.  Both versions may be
  installed simultaneously without any conflict (gpg is called gpg2 in
  GnuPG 2).  In fact, the gpg version from GnuPG 1.4 is able to make
  use of the gpg-agent as included in GnuPG 2 and allows for seamless
  passphrase caching.  The advantage of GnuPG 1.4 is its smaller size
  and no dependency on other modules at run and build time.


* HOW TO GET MORE INFORMATION

  A description of new features and changes in version 2.1 can be
  found in the file "doc/whats-new-in-2.1.txt" and online at
  "https://gnupg.org/faq/whats-new-in-2.1.html" .

  The primary WWW page is "https://www.gnupg.org"
             or using Tor "http://ic6au7wa3f6naxjq.onion"
  The primary FTP site is "ftp://ftp.gnupg.org/gcrypt/"

  See [[https://gnupg.org/download/mirrors.html]] for a list of
  mirrors and use them if possible.  You may also find GnuPG mirrored
  on some of the regular GNU mirrors.

  We have some mailing lists dedicated to GnuPG:

     [email protected]   For important announcements like new
                                versions and such stuff.  This is a
                                moderated list and has very low traffic.
                                Do not post to this list.

     [email protected]      For general user discussion and
                                help (English).

     [email protected]         German speaking counterpart of
                                gnupg-users.

     [email protected]         Russian speaking counterpart of
                                gnupg-users.

     [email protected]      GnuPG developers main forum.

  You subscribe to one of the list by sending mail with a subject of
  "subscribe" to [email protected], where x is the name of the
  mailing list (gnupg-announce, gnupg-users, etc.). See
  https://www.gnupg.org/documentation/mailing-lists.html for archives
  of the mailing lists.

  Please direct bug reports to http://bugs.gnupg.org or post them
  direct to the mailing list <[email protected]>.

  Please direct questions about GnuPG to the users mailing list or one
  of the PGP newsgroups; please do not direct questions to one of the
  authors directly as we are busy working on improvements and bug
  fixes.  The English and German mailing lists are watched by the
  authors and we try to answer questions when time allows us.

  Commercial grade support for GnuPG is available; for a listing of
  offers see https://www.gnupg.org/service.html .  Maintaining and
  improving GnuPG requires a lot of time.  Since 2001, g10 Code GmbH,
  a German company owned and headed by GnuPG's principal author Werner
  Koch, is bearing the majority of these costs.  To keep GnuPG in a
  healthy state, they need your support.

  Please consider to donate at https://gnupg.org/donate/ .


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