OpenPGP

Now that you've set up APG and K9 to allow you to send and receive encrypted and signed emails from your Android phone, you've probably found that you need to import OpenPGP keys. Fortunately, if the keys you need can be found on keyservers, APG can download and import them for you.

This post is the second in the series on using OpenPG to sign and/or encrypt emails on Android.
This guide covers the setup of the K9 email client on Android for use with APG in order to encrypt and sign emails with OpenPGP. It also covers other basic options in K9, such as setting email signatures for outgoing messages, and how to send emails.
This guide requires that the steps in Installing and Configuring APG be implemented on your phone first.

Updated to include picutures

This post is the first in the series on use OpenPG to sign and/or encrypt emails on Android.
In this post, the OpenPGP key manager for Android, APG, is installed and configured.
To follow all of the steps in this guide, you need to have a public and private OpenPGP key.. The steps doing so can be found at here under the Setting Up GPG heading.

Now updated to include screenshots of the installation.

Installation

This article covers how to configure Enigmail for Thunderbird, and is part of a series in communications security.

This post requires GnuPG to be setup beforehand. See Security for guides to GnuPG.

Installing and Basic Configuration of Enigmail

This article covers how to move your OpenPGP key between computers, and is part of a series in communications security.
The specifics cover moving between Linux computers using GnuPG, although many of the steps will apply to Windows running GnuPG (the main difference should be locating the location of the GnuPG folder under Windows).

This post follows Uploading Your Public Key to a Key Server.
See Security for more posts in the series on communications security.

This article covers how to upload your OpenPGP public key to a key server, and is part of a series in communications security.

This post follows Generating GnuPG Keys
See Security for more posts in the series on communications security.

A Note On Key IDs

Any time you see "keyid" in a command, you can use the key id (Finding Your GnuPG Key ID) or part of the name associated with the key.

Generate the Revocation Key

This article covers how to generate keys in GnuPG, and is part of a series in communications security.

See Security for more articles in the series on communications security.

Note on Exiting

If at any point after you've finished running a command or a set of commands in GnuPG, you are still within the GPG shell (for example, if you enter a command and get a response saying the command doesn't exist), then type in quit to quit out of the GPG shell.