p≡p for Android¶
This section covers the system requirements, feature list, installation and user guide of p≡p for Android.
Mobile phone or tablet with Android version 5.0 and higher
E-Mail account accessible through IMAP/SMTP
The following features are available in p≡p for Android version 1.1.:
Encrypt/decrypt emails and their subjects
Store messages encrypted or unencrypted on the server (Untrusted or Trusted server)
Compatibility with OpenPGP (as a p≡p user you can communicate with users that use OpenPGP)
Passive Mode (public key only attached if the communication partner uses p≡p)
Automated, decentralized key management
Import Private Keys
p≡p Sync, automated synchronization of keys between all your devices using p≡p.
The following languages are supported:
First steps in p≡p for Android¶
Before you install p≡p for Android, we strongly recommend to secure your device by all available means.
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.
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.
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 Store messages securely.
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 icon displayed on top of opened messages. 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. Please note, that the very first message between two p≡p users will be sent unencrypted.
For general information about the handshake, refer to Handshake.
To perform a Handshake, the Handshake dialog can be opened by clicking the Privacy Status icon. 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.
After comparing the Trustwords with the communication partner through a separate channel, select “Confirm” if the Trustwords match otherwise “Reject” 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.
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 long pressing the Privacy Status icon and select ‘Disable Protection’.
The Privacy Status as well as the rating for a communication partner will change from Yellow (Secure) or Green (Secure & Trusted) to Disabled and the message will be sent unencrypted when the user presses ‘Send’.
Sending BCC emails¶
Currently, p≡p sends messages unencrypted as soon as there is at least 1 recipient in BCC (even if keys of all recipients are available).
p≡p for Android Settings¶
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” -> “Privacy”. Further, when an account is selected, there is additional privacy options on account level.
Settings - Global Settings¶
Global settings are used for all accounts in the app:
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 Passive Mode.
Unsecure reply warning¶
Defines if a warning message should be shown, when a formerly encrypted message is forwarded or replied to unsecure.
Reset (all accounts)¶
This will reset the privacy settings of all your accounts (e.g. revoke your existing key and create a new one).
If you want to do a reset for only one of your accounts, right click the account in the account list above and select “Reset”.
For more details see Reset.
If p≡p Sync is enabled, p≡p will check if other devices are using the same email account and try to build or join a device group. p≡p Sync ensures that all messages can be decrypted on all devices.
For more details see p≡p Sync.
Protect message subject¶
When sending messages between p≡p users, the subject is always encrypted (in transport). However, when “Protect message subject” is disabled, p≡p will decrypt the subject of messages stored in the mailbox and save the subject unencrypted.
Further, when “Protected message subject” is disabled, the subject of messages sent to PGP users will not be encrypted at all.
For more details see Protect message subject.
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.
If enabled, the UTC timezone will be used instead of the timezone of your location in the mail headers.
Account Settings - Privacy¶
Account settings can be configured for each account individually:
p≡p privacy protection¶
Defines if p≡p privacy protection is enabled for the selected account or not. For more details see Enable p≡p privacy protection.
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.
This will reset the privacy settings of the current account (e.g. revoke your existing key and create a new one).
For more details see Reset.
PGP 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.
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.
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, follow the steps below:
Go to Settings
Long press on the account for which you want to import a key and select “Advanced” -> PGP Key import from filesystem
Enter the fingerprint of the key you want to import and click “Select and import key”
The file explorer will open. Browse to the directory where you saved your key and and select it