Notes for ~GnuPG users on several platforms

== General Remarks 

Always use a current version of GnuPG Version >= 2.
(There are only a few rare exceptions to this rule.)
GnuPG 2.1.x is "modern", not all applications may already support the new features fully. So when in doubt, use GnuPG 2.0.x.

== Ubuntu 

gnome-keyring or seahorse may pose as gpg-agent, but known versions today (2014-11) are not fully compatible with the gpg-agent protocol. 
So applications may show errors or cannot work when they believe they are talking to gpg-agent and try to use its features. Examples:
{{{ERR 280 not implemented}}} or a protocol error in the Kleopatra self-tests.

You can detect the situation with GnuPG 2.0.x when checking the environment variable on a shell like {{{echo $GPG_AGENT_INFO}}}.
You are talking for a gpg-agent for good, if it has something with gpg-agent in it and a corresponding gpg-agent process is running. Otherwise the connection has probably been taken over. 

Solution: Disable gnome-keyring, some hints on how to disable it are within the [[https://www.programmierecke.net/howto/gpg-ssh.html|notes on how to use gpg-agent with ssh]] (you need only the disable part, not the ssh part) or [[http://lists.gnupg.org/pipermail/gnupg-users/2014-September/050812.html|here]].

(TODO link or describe better solution, link/create reports for ubuntu and gnome) For some Details see this [[http://lists.gnupg.org/pipermail/gnupg-users/2014-September/050800.html|gnupg-users post]].

== Debian

Note that the gnupg2 Package may search for files in paths
that differ from the paths of a vanilla build and what its written in the documentation.

E.g: The gpgsm[2.0.19-2+deb7u1] in Wheezy looks in {{{/etc/gnupg2/trustlist.txt}}} but the docs differ ([[http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=725804|Debian defect #725804]]).

== Mac OS X

* http://sourceforge.net/p/gpgosx/docu/Home/ 
* https://gpgtools.org


== Android

* https://guardianproject.info/ , they have experimental builds of a GnuPG port, see https://guardianproject.info/2013/05/09/gnupg-for-android-progress-we-have-an-app/
* See APG and OpenPGP-Keychain via OtherFreeSoftwareOpenPGP

== Webbrowser

* https://webpg.org/ , successor of ~FireGPG. //provides an interface to GnuPG by way of an [[https://en.wikipedia.org/wiki/NPAPI|NPAPI]] plugin// 
* See users of openpgp.js via OtherFreeSoftwareOpenPGP
* http://thinkst.com/tools/cr-gpg/ a Chromium extension. TODO: License ? alpha, last activity 2012