p≡p for Android


This section covers the system requirements, feature list, installation- and user-guide of p≡p for Android.

System Requirements

  • Mobile phone or tablet with Android version 5.0 and higher
  • Google Play store or F-Droid
  • E-Mail account accessible through IMAP/SMTP

Feature list

  • Encrypt/decrypt emails and their subjects
  • Untrusted server (save emails encrypted on the server) / Trusted server (save decrypted emails on the server)
  • Compatibility with OpenPGP (exchange messages with OpenPGP users, key server lookup, display fingerprint, blacklist keys, disable subject encryption)
  • Passive Mode (public key only attached if the communication partner uses p≡p)
  • Import Private Key from other p≡p or OpenPGP devices
  • New material design UI
  • Multilanguage support including Trustwords (Catalan, English, French, German, Spanish, Turkish)

Installation of p≡p from Google Play Store


Before you install p≡p on your device, we strongly recommend you to encrypt your device.

The installation is straight forward, asks no questions and requests no information.

Step 1. Go to Google Play or open the Google Play Store app Play Store.

Step 2. Search for “pEp” or open the following link https://play.google.com/store/apps/details?id=security.pEp

Step 3. Touch the p≡p app’s price button to install. After a few seconds, the “Open” button appears and when you press it, the p≡p opens with the following screen:


Installation of p≡p from F-Droid


Before you install p≡p on your device, we strongly recommend you to encrypt your device.

The installation is straight forward, asks no questions and requests no information.

p≡p can be found in standard F-Droid repository

Step 1. Open the F-Droid app.

Step 2. Search for “pEp”.

Step 3. Touch the p≡p app’s install button to install.

Step 4. Follow the on-screen instructions. After the installation, you will be able to see the p≡p icon on your screen.

User Guide

First steps in p≡p for Android

In order to use p≡p, you need to setup your email account. As soon as the email account is set-up, you can use p≡p without any additional configuration. It is not necessary to change any Android settings for p≡p to work.

At the first start the app will ask you to give some permissions:


Reading contacts permission is to autofilling contacts when writing emails. It’s optional and you can change it anytime. We are not collecting any contacts, everything stays on your device.


Download files permission is there to simply allows you to save attachments from emails to local storage. It’s optional and you can change it anytime.


Disable battery optimizations permission is making sure that Android system will not close the app and app can still receive emails in the background. It’s optional and you can change it anytime.


Now, you will need to add your email account(s). In case you have a Google Account, select “Use OAuth 2.0 token”.


On the next screen you enter the detailed account settings. You should have this information from your email provider or administrator.

IMAP settings


SMTP settings


Account Settings

On this screen you can configure account specific settings, e.g. how frequently p≡p should poll messages from the server. For more information about the last option “p≡p - Trust server and store mails unprotected”, see Server Trust (store messages securely).


Account Name

On the last screen you can set a name to the account (this is how the account will be displayed in your account list) and also enter your own name (displays on outgoing messages).


After you entered all your account settings, p≡p app will generate private keys. After this step you can immediately send and receive encrypted emails.

p≡p for Android users will now see the ‘Privacy Status’ bar displayed on top of opened messages (in this case Gray). Clicking on the p≡p icon in the Privacy Status will provide additional information on the available trust level.


Sending Secure Emails

After a message from another p≡p user is received and you reply to that message, the Privacy Status on the top of the message is yellow. This means, that this message will be sent encrypted. The same applies if a user enters an email address for which p≡p automatically finds a public key on the public PGP key server (optional setting). Please note, that the very first message between two p≡p users will be sent unencrypted.


The Handshake

For general information about the handshake, refer to Handshake.

To perform a Handshake, the Handshake dialog can be opened by clicking the Privacy Status. The following window appears:


You can change the language of the Trustwords after touching 3 dots in the top right corner. There is choice of 6 languages: Catalan, German, Spanish, French, Turkish and English.


Choice of Trustwords languages:


After selecting Trustwords in Spanish:


In case your communication partner is an OpenPGP user, you can also open the PGP fingerprint:

_images/pEp4Android-v1.0.200rc1-PrivacyStatusHandshakeTrustwordsLanguage.png _images/pEp4Android-v1.0.200rc1-PrivacyStatusHandshakeTrustwordsPGPFingerprint.png

After comparing the Trustwords with the communication partner through a separate channel, select “Confirm Truswords” if the Trustwords match otherwise “Wrong Trustwords” if the Trustwords didn’t match. After you confirmed the Trustwords, the Privacy Status changed to Green (Secure & Trusted).

This step is done once with each communication partner and any future communication remains Green (Secure & Trusted).


Sending a message to multiple people with different Privacy Statuses

When sending a message to more than one person, you simply add the recipients to the message. The Privacy Status bar at the top will show you, if the message will be sent encrypted or not. In the below example you can see that there are 3 recipients. Because only 1 recipient has p≡p or a compatible product installed, the message will be sent unencrypted.


Disabling Protection when the communication partner’s Privacy Status is Yellow (Secure) or Green (Secure & Trusted)

When the communication partner’s Privacy Status is Yellow (Secure) or Green (Secure & Trusted), the e-mail will automatically be sent encrypted, when the user clicks ‘Send’. If the user would like to disable protection on a case by case basis, then the user can do so by selecting the ‘Disable Protection’ button in the options of the message.


The Privacy Status as well as the rating for a communication partner will change from Yellow (Secure) or Green (Secure & Trusted) to Gray (Unsecure) and the message will be sent unencrypted when the user presses ‘Send’.

_images/pEp4Android-v1.0.200rc1-DisableProtection-Gray.png _images/pEp4Android-v1.0.200rc1-DisableProtection-GrayStatus.png

Key Import

If you already have a PGP Key that you wish to use, you can do though by importing the key into p≡p.

Please be aware that only keys without a passphrase can be imported. If your key uses a passphrase, please remove it first.

First you need to load your private key to the local file system of your phone. Refer to the manual of your phone manufacturer on how to do this.

Then click the hamburger icon on the top left, select the arrow down next to the account name.


Then click Manage accounts.


On the Accounts screen, long press on the account for which you want to import a key. When the menu appears, select Key Import -> PGP Key Import -> PGP Key import from filesystem:

_images/pEp4Android-v1.0.200-PGP-KeyImport4.png _images/pEp4Android-v1.0.212-PGP-KeyImport5.png _images/pEp4Android-v1.0.212-FS-KeyImport6.png

To make sure the correct key is going to be imported, enter the Key ID (e.g. “DDC36BDA”) or Fingerprint (e.g. “2035 8EB7 96BE D71F CE2C 3EBF A77A 52CE 41E6 EA5E”) of the key, that you want to import. Then click “Select and import key”


Then browse to the directory where you saved your key and and select it.


The key will now be imported.


After the import, the following message appears:


After the import p≡p will use your key to encrypt and decrypt messages. Please be aware that p≡p automates the key management and your key may change (e.g. after a reset, when joining a device group or when a key expires). Even if p≡p starts using another key, old keys will always be kept to ensure that all messages can be decrypted.

p≡p for Android Options

This section covers all available options related to p≡p email encryption/decryption in p≡p for Android. These options can be opened by clicking the three dots on the top right while you are in a folder and then select Settings -> “Global Settings” or “Account Settings” -> p≡p.


Settings - Global Settings

Global settings are used for all accounts in the app:



Passive mode

By default, p≡p for Android attaches your public key to every outgoing email. When passive mode is enabled, p≡p doesn’t attach a public key to outgoing messages unless the communication partner uses p≡p. If you already have a public key from your communication partner, p≡p will encrypt your emails by default. For more details see p≡p Sync.

Unsecure reply warning

Defines if a warning message should be shown, when a formerly encrypted message is forwarded or replied to unsecure. For more details see Show a warning when a message loses security through reply or forward.

OpenPGP Compatibility

Unprotected message subjects

The user can choose, whether the subject of a message should be protected/encrypted. If the subject is encrypted, the users of other OpenPGP clients will then only see the subject “pEp” instead of the original subject. The actual subject is displayed in the first line of the body for plain text messages. For HTML messages, the subject is not visible. Subject Encryption is enabled by default.


If the user does not wish to use a key of a PGP communication partner anymore, then the user can enter the fingerprint of the key and add it to the blacklist. Please note this affects only PGP contacts, p≡p users won’t be affected by this blacklist.


Settings - Account Settings

Account settings can be configured for each account individually:


p≡p privacy protection

Enable p≡p privacy protection for this account. When you disable this feature, no features of p≡p will be working for the selected account.

Store messages securely

Store server side e-mails protected (encrypted with own private key). When you disable this feature, p≡p will trust the server and keep all your emails stored on the server unencrypted.

Extra Key Management

All outgoing messages are additionally encrypted with those keys defined in the extra keys list. All incoming messages are re-encrypted with the defined keys. Refer to Extra Keys for more details.